This can cause serious damage to the engine. . On December 6, 2000, a ceremony was held at Cleveland Engine Plant One to celebrate the assembly of Fords final five-liter, pushrod V8 engine. 3.0L SOHC 24 Valve Engine Interference Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The 4.0 SOHC engine was introduced in the Ford Explorer in 2006. What characteristics allow plants to survive in the desert? 2.0L Interference 2.6L Interference S60 Interference Non-Interference 2.3L 4 Cyl. (B2500) Non-Interference Greg Macke is a car blogger and author of My 7 Secrets to Buying a High Quality Used Car. 2003 Ford Focus Timing Belt Or Chain All the North American 2003 Ford Focus models have timing chains or timing belts and are interference or non-interference depending on the engine. Owners of Ford vehicles equipped with interference engines and timing belts rather than timing chains should follow the automakers recommendations for changing timing belts. 2.3L SOHC Gasoline Non-Interference This can be caused by overheating or by excessive pressure in the cooling system (from things like a blocked radiator). 2.2L Diesel Interference It is a V6 engine that features four valves per cylinder and dual overhead cams. Unlike the previous years where there were two versions of the 302, there was now only one iteration of 5.0 with the addition of SEFI. Aftermarket Products, Reviews & Installation, Suggestions, Comments & Questions about the Forum, Send a private message to flareside_thunder, 2006 F150 5.4 Sputtering - New thread CONDENSED, Do Not Sell or Share My Personal Information. 1.6L SOHC Interference If a timing belt breaks in an interference engine while the engine is running, the pistons and valves may collide, because they do not have enough clearance between them if the cam stops . We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The 5.0L became available in the AWD Ford Explorer in 1997. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. It is known for its high performance and reliability. 4.19 out of 5 stars. This timing chain cassette can be replaced without having to pull the engine out of the vehicle. To this day, the small block 302 is still strongly supported by aftermarket components. Best Tuner for 6.0 Powerstroke [Review and Buying Guide]. The chain runs over a series of sprockets that are mounted on the camshafts. Is a 302 Ford an interference engine? This cylinder head was used on LX and GT Mustangs until the retirement of the Fox Body Mustang in 1993. B234 (F, G) Intereference In thinking about this situation, the 302 might go either way on the freewheeling issue. The 4.0 engine was used in a variety of vehicles, including the Ford Explorer, Ranger, and Mustang. This engine block was also gray instead of blue and this was the first year for gray. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. 1.5L (3E-E & 5E-FE) Non-Interference So, you have to expect that repair will be costly. And for one final tidbit of random information, there were roughly 10,000 of these engines shipped to Ford of Australia to be used in its Falcon line. Talk about your 8th and 9th generation Ford F150 trucks. It reaches speeds of 200MPH with ease. 2.4L DOHC Non-Interference (Valves may hit if camshafts turn out of time) Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Interference Engines - Complete List Can I just replace my timing chain or is there potential valve damage? From 1979 to 1995, the Mustang 302 was a liquid-cooled, overhead-valve, 90-degree V-8 engine. Jun 15, 2012. For all of its minor quirks, the Coyote-equipped generation is one of the best used Mustangs available. S80 Interference The Ford engineers supplied a larger mass air flow meter which was the same size as the '93 Cobra. The short answer is yes, This is Ford 4.0 An Interference Engine. This may have been to distinguish the engines from the 300 cu Ford straight-six engine, otherwise known as the 4.9L. So here comes 1993! It was used in a variety of vehicles, including the Ford Ranger, Explorer, and Aerostar. (Image/Jim Smart) I have never had that happen but that doesn't mean it wont. On the left is a 1970 vintage 302 harmonic dampener with a 28-ounce offset balance. In 1987, there were more changes to the 302. You can call me gearheads or petrolheads. The size zero (0) rating of the Kei class was instituted as a tax preference but also provided recognition that the small cars met Japans strict guidelines for road handling and safety. The difference between an interference and non-interference engine is whether there is a gap between the valve that is fully open and the piston that is in the top position. Non-Interference All Honda engines are interference except 3.0L & 3.2 which are Non-interference 1.8L 4 Cyl. Reviewers love the 4.6-liter V8. #4. This means that there are two types of engines in this regard: interference and non-interference engines. 3.0L DOHC Interference This makes it a good choice for those who are not experienced in working on engines, or for those who want to save money by doing their own repairs and maintenance. Ford engineers have taken into account the fact that not all cars are using the exact same size of the engine and when designing their engines, they need to be able to accommodate several different sizes. This is a big job, but it can be done without pulling the engine. Follow me on. From 1979 to 1995, the Mustang 302 was a liquid-cooled, overhead-valve, 90-degree V-8 engine. 2.2L DOHC Interference Unfortunately, this scenario can damage the valves. Does the f150 have an interference engine? . These cookies track visitors across websites and collect information to provide customized ads. The Ford 4.0 V6 engine is a popular choice for many Ford vehicles. Yes your vehicle is an interference engine, therefore if the timing belt breaks then engine damage will result. 1.7L Non-Interference If you don't need the performance of a stroker and just need a reliable 302 Ford crate engine, look no further. Support the engine with a jack and remove the drive belts. In the non-interference, the distance between the pistons and valves is quite large. These are typically found without variable valve timing (VTec) or variable cam timing (VTec-e). SHE MAIN . Back to main. If you suspect ignition coil failure, its best to replace all coils at once rather than just one at a time. They have incorporated some safety precautions. Posted by McNally on March 4, 2022. Does the 4.6 have cam phaser problems? The 302 cubic-inch engine was first referred to by Ford as a "5.0-liter" V-8, which was a metric unit of measurement rather than the U.S. customary notation. The roller design allows for more cam lift and more aggressive lobe profiles than traditional flat tappet designs. Roush is a registered trademark of Roush Enterprises Inc. Eaton is a trademark of the Eaton Corporation. 2.7L Interference 2.4L SOHC Interference 2.4L SOHC Interference But like any engine, its not without its problems. The Zetec IS an interference engine, give that regular pistons will hit the valves. The new 5.0L V8 option was developed with the target to compete with the GM 6.2L V8 engine and the new Chrysler 6.4L Hemi. The lists of interference engines provided in this article include the following, among others: Read on to learn more about the different automotive brands with interference and non-interference engines, the impact of interference engines on your vehicles, and more. Finally, you can ask a mechanic to check for you. The only Ford engines that are interference engines are ones equipped with variable cam timing (VTec) or variable valve timing (VTec-e). My #8 intake valve makes a ticking/tapping noise. With over 30 years of experience in remanufacturing stock replacement, marine and high-performance engines, Tri Star Engines is . Is there a way to check the slack in the timing chain without pulling everything apart? When to change the timing chain on a non interference engine? The engine is called an interference engine for a purpose; because the piston interferes with the completely open valves and occupies the same space. Although, early 87 cars did have E5TE cylinder heads which were first used on the 1985 truck engines. I've always been fascinated with cars and tools accessories. If your engine interferes, it means that the valves and pistons share the same space in the cylinder. Engines from the Good ole days used crowned, pop-up pistons, and even higher lift cams, and I could believe those would be interference engines. 960 Interference CAFE stands for Corporate Average Fuel Economy. 5.7 Hemi Intereference, 1.3L 128 Series Interference 2.0L DOHC (Probe) Interference Not so with a non-interference engine. Ford used its 2.0-liter engine in the 1993 to 1998 Probe, its 2.2-liter engine in the 1985 Ranger truck, and its 2.0-liter engine in the 1986 to 1988 Ranger. 3.6L Intereference, 1.0L Interference The engine could be a 1.8- or 2.0-liter engine. Then in 1964, that engine was also overboard to a 289, and then a few short years later, the 289 was stroked to a 302. 1.3L SOHC Interference Unfortunately, with this type of car issue, there is a huge amount of labor involved. meaning, do the valves come far enough down into the combustion chamber that they overlap where the piston raises to before detonation (meaning they could be bent/shattered by the piston in the event of a timing chain failure)? B5XXX five-cylinder inline engines -Interference Besides, it always pays to know. Is a 2002 Ford Focus a non interference engine? They are reasonably priced too. Are there any Honda engines that are non interference? The 2.0L Duratec engine in these models has a non-interference design.This engine is paired with either a 5-speed manual or a 4-speed automatic transmission and has a maximum output of 140 horsepower and 136 lb-ft of torque.. For anyone looking for a dependable, affordable, and fuel-efficient vehicle, the . Late Model Restoration has no affiliation with Ford Motor Company, Roush Enterprises, Eaton, or Saleen. I just want to know if the chain snaps if it will destroy the engine or not.. These engines 'breathe' better than non-interference, and they often have higher compression, which equals more power. 2.22L SOHC Interference While this engine produced less horsepower than the 85 version at 200 horsepower, it did make 285 lb-ft of torque which was an increase of 15 lb-ft. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. It refers to a 4-stroke internal combustion piston engine wherein the valves are in a completely open position. But it did have some issues for a number of drivers. 3.0L V6 Non-Interference This bumped the compression ratio to 9.2:1. 2.2L Diesel Interference Sheesh, Im a victim of my own proofreading! 1.6L DOHC Interference The best place to go for anything Mustang related! However, the Zetec ACTS as a freewheeling engine, given that Ford put recessed pistons in the engine to give the valves clearance to be fully extended and the crank can turn without the cams without damage to the pistons or valves. What is a Salvaged Car and Should you Buy One? 1.8L Interference Non-Interference 3.3L Interference All Honda engines are Interference except 3.0L & 3.2 which are Non-Interference. There is no standard repair process for bent valves. n2.2L Gasoline Interference If youre looking for maximum power, the DOHC version is the way to go. One of the reasons why the 4.0 SOHC engine is so popular is because it offers a great balance between power and economy. The original Escort was powered by a 1.6L 4 cylinder, 69 horsepower engine with a two barrel carburetor. The torque output is 250 lb-ft at 4250 rpm. Your email address will not be published. Saleen is a registered trademark of Saleen Incorporated. I'm looking to do a full rebuild/engine build with mostly new parts. Is the ford 302 an interference engine? im not to keen on that use of the term "may live" haha, Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W), Do Not Sell or Share My Personal Information, 2023 Super Duty Order Tracking / No Off Topic Please, 73 F100 302 with Mustang 5.0 stock headers. These leaks can come from a variety of places, including the oil pan gasket, front crankshaft seal, and rear main seal. Is the 302 in / 5.0 Liter an interference engine? What is causing the plague in Thebes and how can it be fixed? Interference engines are often considered superior to non-interference. Since we specialize in 1979 to present Mustang restoration and performance parts, we're going to talk about the history of the push rod 302 from 1979 to 1995. 3.0L DOHC Interference is less likely than 1 or 2 with a problem. For 1997, revised cylinder heads increased output of the 5.0L V8 to 215 hp. I, Dencan Brain BOIDAR, call myself a Torque master. While still very debatable, the power improvement over the 1993 engine was primarily from airflow improvements. Non-interference engines on the other hand do not share the same powertrain components with normally aspirated, non-interference. Is the Ford EcoBoost 4.6L an interference engine? 4.0L Interference 3.0L & 3.2L SHO Non-Interference (B2300) Non-Interference 2.5L 4 Cyl. This engine was rated at 140 horsepower and 250 lb-ft of torque with an 8.4:1 compression ratio. Yes its true! This engine is used in a variety of Ford vehicles, including the Edge, Escape, and Explorer. All rights reserved 2023 Copyright RoadSumo.com. There are a few ways to tell if your engine is interfering. 1.6L Non-Interference Interference engines are common among the latest automotive models. It was a 4.2-liter or 255 cubic inch variant of the 302 which had a smaller bore of 3.68 inches. The 3.2L and 3.0L DOHC (1989 - 1995) engines have a timing belt and are non-interference. (B2500) Non-Interference 5.0Resto, SVE, LMR are registered trademarks of Latemodel Restoration Supply, Inc. Ford, SVT, Special Vehicle Team, Ford Mustang, Ford Lightning, Mach 1, Mach-E, Shelby GT500, GT350, GT350R, New Edge, Boss 302, 5.0, Cobra R, Fox Body Mustang, Ghia, Turbo GT, SVT Cobra, Cobra Jet, Bullitt, California Special, Cobra, GT, V6, S197, SN95, S550, S650, Dark Horse, F-Series, F-150, Triton, F150 Raptor, Raptor, EcoBoost, Bronco, Bronco Sport, Badlands, Big Bend, Black Diamond, Outer Banks, Wildtrak, and Sasquatch are all registered trademarks of Ford Motor Company. 1.6L DOHC (Nova) Non-Interference 5.0L/302 5.0L/302 . Fords interference diesel engines include 2.0-liter, 2.3-liter and 2.4-liter units. but he said in his experience, these old 302's have very little valve clearance and it probably isn't worth the $500 to replace the timing chain since it is almost certain that I have bent valves as well 1.6L SOHC (Nova) Non-Interference 240DL 2.3 Non-Interference S40 Interference 2.3L Diesel Interference If you suspect that your timing chain may need to be replaced, its best to take your vehicle to a qualified mechanic or Ford dealership for diagnosis and repair. This cookie is set by GDPR Cookie Consent plugin. The new 5.0 carried an H.O. It featured a Motorcraft carb which was rated at 368.5 cfm and the intake manifold was cast aluminum. The timing chain on the 4.0 SOHC engine is made of metal links that are connected to each other with rivets. 6 What makes a car an interference or non interference engine? 1.8L 4 Cyl. It pays to know. 3.2L Interference Are there any Honda engines that are non interference? Free shipping for many products! 1985 was the last year of the carbureted 302 in the Mustang. The fastest Ford on Earth is the GT supercar, with an incredible 740HP. For the 1983 Mustang, the five-liter engine received a 4-barrel Holley 600 cfm carb which allowed for an additional 18 horsepower. Finally, another common problem with this engine is head gasket failure. 2.4L Diesel Interference In Canada, Ford had a V8 engine in 1956 and called it the Y-Block, based on the flathead design that was used a decade earlier. You can do it by improving the compression ratio and allowing the valves to improve airflow. Suffice it to say that the rotation of both the camshaft and the crankshaft fails to synchronize. The cookie is used to store the user consent for the cookies in the category "Other. The modular motors are certainly interference engines. If the piston travels far enough in the cylinder to actually hit the open valves, that's an interference engine. Is my motor interference or non interference? The firing order was also changed from 1-5-4-2-6-3-7-8 to the 351 Windsor sequence of 1-3-7-2-6-5-4-8 which we have detailed in the image below: The cylinder heads were larger than those of the 4.2-liter and most people referred to this as normal 5.0 intake ports. The last non-crasher belt drives I know of were Ford Ranger 2.2/2.5's. There's not many non-interference engines built in the last decade. 16 valve diesels Interference Reviewers love the 4.6-liter V8. The result is usually catastrophic engine failure. XC90s Interference, Greg Macke is a car blogger and author of My 7 Secrets to Buying a High Quality Used Car. With Ford making the switch to the 4.6-liter modular engines in 1996 for the Mustang, they did produce the 302 up until 2001 which was an engine option in the Ford Explorer and standard in the Mercury Mountaineer. American 2V 351Clevelands came equipped with two barrelled carbs and as such the engine was designed to be the common version of the engine fitted to non performance cars. Interference engines are highly preferred because they are proven to breathe better, and their compression ratio is a bit higher, which guarantees better performance. With Ford, generally anything with a chain is gonna be interference. 3.5L Interference Trucks/SUVs, yes. This cookie is set by GDPR Cookie Consent plugin. 2.0L 8 valve Non-Interference (However therehave been instances of bent valves) The Ford 4.6L Crown Victoria had an interference engine from 1991 to 1998. The Ford 4.6 engine came with a plastic intake manifold from the 1996 until 2001 model years. If you start hearing clanking noise when the engine is on, the timing chain is due for change. If the cylinders and pistons are in place, but several valves are bent, there might not be any need to replace or rebuild the entire engine. Toyota brand comprises 13 non-interference engines, including 1.5L, 1.6L DOHC Non-Interference (Valves), 1.6L SOHC, 1.8L 7AFE, 4AFE, 4AF, 2.0L, 2.2L, 2.5L. Under the wrong conditions, any engine that jumps timing may be damaged. What are some interference engines made by Ford? 1.6L SOHC (Storm) Non-Interference But opting out of some of these cookies may affect your browsing experience. 1.8L DOHC Gasoline Interference If there is a gap, the engine is called a non-interference engine. This is because repair options vary, depending on the type or severity of the damage. This cookie is set by GDPR Cookie Consent plugin. Member since Apr 2021. If you are not sure about the type of engine your vehicle has, the list above is expected to help you identify it. 2.0L Non-Interference Yes to non-interference design on that model (some others like SVT were interference design) but there have been people who bent valves when timing belts broke at speed despite the theoretical non-interference design. Advertising - Ask. However, this also means that there is less room for error when it comes to maintaining proper timing between the pistons and valves. Thanks for the welcome. The distinctive fifteen-inch air cleaner assembly was derived from the 351 Ford LTD H.O. The automatic transmission-equipped Mustangs with CFI still used the non-roller engine and in early 1985 they were rated at 165 horsepower and 245 lb-ft of torque. 4.7L Interference, 1.5L Non-Interference 2.4L Diesel Interference Most Popular for You: 11 Salient Questions to Ask When Buying A Used Car This applies to engines with a timing belt and engines that use a timing chain. The engine block and cylinder heads were cast iron. This cookie is set by GDPR Cookie Consent plugin. The following lists will allow you to determine whether your vehicle has an interference engine or not. tag which was short for high output. What Does Hemi Mean? You have to know the features of each one of them. A non interference, or free wheeling engine is an engine where the pistons will not contact any open valves at any time. (B2300) Non-Interference Fords interference diesel engines include 2.0-liter, 2.3-liter and 2.4-liter units. Pretty rare for a timing chain to flat out break. The garage and the belt kit should both have warranty to cover something like this, depending on whether it was a defective part or incompetence that caused the issue. Both engines are available with either manual or automatic transmissions. From 1983 to 1985, the 302 didnt change all that much. There are two main types of 4.0 engines: the SOHC (single overhead cam) and the DOHC (dual overhead cam). It has a cast iron block and aluminum heads and uses regular unleaded gasoline. Ford introduced the 5.0L V8 as an option for the Explorer in 1996. In this article, I will provide an interference engine list for several automotive brands. The 4-barrel carb came with a redesigned automatic choke and was rated at 165 horsepower, which was 10 less than the manual. However, there are a few notable differences between the Coyote in the F-150 and the Coyote in the Mustang. They include wiring diagrams and technical service bulletins. This engine was a direct result of Fords efforts to meet the ever more stringent CAFE requirements for fuel mileage. 3.4L Non-Interference But opting out of some of these cookies may affect your browsing experience. 1.3L Interference 940 SOHC Non-interference 3.0L Inline 6 (Except 1998 2JZ-GE) Non-Interference If there is a gap between the valves and the pistons, the engine is called a non-interference engine. Is a 302 Ford an interference engine? If they are interference type engines, Id pay close attention to the belt change intervals! If youre considering a vehicle with a 4.0 engine, its important to know the difference between the SOHC and DOHC versions. Does anybody know if the 460's in 1975 were interference engines? 1.6L 16 Valve Engine Interference is 302 an interference engine? 3.5L Non-Interference Remove the oil filter housing and dipstick tube. It only uses a qt. 1970 Ford Mustang Boss 302. 1.3L Interference The cookie is used to store the user consent for the cookies in the category "Analytics". The Ford Mustang comes with one of three engines a 4.0-liter V6 that makes 210 horsepower and 240 pound-feet of torque, a 4.6-liter V8 that makes 300 horsepower and 320 pound-feet of torque and a 5.4-liter V8 that makes 500 horsepower and 480 pound-feet of torque. 1.6L SOHC Interference These cookies track visitors across websites and collect information to provide customized ads. S/V/C 70 Interference 3.8L Interference Is there a 4.0 Mustang? This is because pistons will continue moving, which will most likely hit valves in a completely open position. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Greg Macke is a car buying specialist, author and consumer advocate working closely in the industry to improve the buyer's experience. 1.6L SOHC 8 Valve Engine (Tracker) Non-Interference 740 SOHC Non-interference This increases the lifespan of the engine and also makes it more efficient. This means that if the timing belt were to break, the valves and pistons would collide, causing major damage to the engine. 5.0L 928 Interference In addition, the 4.0 SOHC engine is very rugged and durable, which makes it ideal for use in tough conditions such as off-road driving or towing. 3.0L SOHC Interference, Villager 3.0 Non-Intereference (B2500) Non-Interference Greg Macke is a car blogger and author of My 7 Secrets to Buying a High Quality Used Car. 3.0L SOHC 12 Valve Engine Non-Interference Just clear tips and lifehacks for every day. List of Ford Interference Engines. PUSHROD CRATE ENGINES // 302. A single-snorkel air-cleaner was used and new for 1979 was an aluminum water pump and a single v-belt accessory drive belt. Come to think of it, Ive never seen a 302 in. 7 When to change the timing chain on a non interference engine? Interference engines made by Ford include its 1.6-liter single overhead cam engine, 2.0-liter double overhead cam engine, 2.2-liter engine, 3.0-liter single overhead cam engine and 3.3-liter engine. Answer (1 of 2): That depends on the manufacturer (there are several that make 3.5L engines). 3.5L DOHC Interference, 2.5L Non-Interference How many interference engines are there in a Suzuki? Its durable, powerful, efficient, and easy to maintain what more could you ask for? For 1994 and 1995, Ford rated the high-output 302 at 215 horsepower and 285 lb-ft of torque. This 302 ran fine until this little boggle. The timing belt or chain is responsible for keeping the pistons and valves in sync with each other; thus, if this component fails or stretches, it can cause the pistons to strike the valves. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. 2.0L Diesel Interference The short block featured a redesigned forged piston with a 30-thousandths deep dish and valve reliefs which netted a 9:1 compression ratio. The Ford 4.0 an Interference Engine, meaning that the valves and pistons share the same space in the cylinder head. Timing chain warns the driver unlike timing belts. The video below will also help you determine if your car has a timing belt or chain. An engine with an intake and exhaust manifold fed by dual-intake throttle bodies, and three consecutive cylinders sharing a single cylinder head might seem to some as having the design characteristics of an interference engine. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. His high quality car buying tutorials offer help to the car buying public. 1.6L DOHC (Storm) Interference Interference engines have tighter tolerances between the moving parts, which results in less vibration and wear. If the timing belt or chain breaks, the valves can hit the pistons and cause severe damage. 3.0L SOHC Interference In 1989, Ford transitioned all of the Mustangs to the mass-air system. What Ford engines are interference engines? VR6 Interference, B200 (E, F, G, GT, FT) Interference In a non-interference engine, the pistons and valves have more space, and no collision occurs if the timing belt breaks while the cam is moving. 2.5L 4 Cyl. I have a 302 ('86 block, 28oz imbalance) with '65 289 heads (round pushrod. Oil leaks are one of the most common problems with the 4.0L V6 Ford engine. 3.8L Interference, 2.0L 924 Turbo Interference I couldn't tell you the last time I saw an oil pressure gauge stock in a car. 2.1L Diesel Interference On the other hand, interference engines have a short space between the pistons and valves and when the . 1.6L 8 Valve Engine Non-Interference 3.0L Inline 6 (1992-97) Non-Interference There is no definitive answer to this question as it depends on a number of factors, including the make and model of the engine, driving conditions, and personal preferences. 2.8L Diesel Interference, 1.5L DOHC Interference A quick search came up with 7 models: Interference Engines * Chrysler 3.5L * Kia 3.5L DOHC * Mitsubishi 3.5L DOHC * Mitsubishi 3.5L SOHC Non-interference Engines * GM & Saturn 3.5L * Isuzu 3.5L . The 4.0 SOHC engine was introduced in the Ford Explorer in 1996, and it quickly became one of the most popular engines in the Ford lineup. The result is usually catastrophic engine failure. This includes everything from the older 289/302/351 pushrod V8s to the latest OHC 4.6L and 5.4L V8s. But what exactly is an interference engine? of oil about every 3000-3500 miles. (adsbygoogle = window.adsbygoogle || []).push({}); 1.8L 1.9L Interference The 4.0 engine is notable for its high power-to-weight ratio and low fuel consumption. 2.2L Gasoline Non-Interference How to Distinguish Interference from Non-interference Engine The latest vehicle models feature interference engines. On the right is a 5.0L dampener with a 50-ounce offset balance. Belt driven engines like some of the 4 cylinders are not interference, but the valves will still hit if the belt breaks at 6000 rpm (Zetec for example). Please consider this a guide only. 1.8L DOHC Interference
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