This is the definition of an interference engine: the valves, when fully open, extend into the cylinder area. Chains are longer lived than most timing belts, and there are no recommended chain replacement intervals published by Ford for these engines. The Kei class was developed to promote small cars in response to oil shortages after World War II. 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 . An interference engine is one thathas insufficient clearance between the valves and pistons if the cam stops turning due to a broken timing belt. 2.0L DOHC (Contour, Escape, Focus, Mystique, ZX2 & 1999-2002 Cougar) Non-Interference First, you can check your owners manual. This cookie is set by GDPR Cookie Consent plugin. is less likely than 1 or 2 with a problem. 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. Terms of Service - police engine package. This is because vehicle manufacturers aim to make engines increase their efficiency. This engine was a direct result of Fords efforts to meet the ever more stringent CAFE requirements for fuel mileage. $600. And if you bring your vehicle to a car care shop, the mechanic will use a borescope camera to assess your vehicle. The "7F29" casting date code means June 29, 1967 at Ford's Cleveland foundry. So, when the timing sprocket or chain breaks, the cam stops, and the pistons still moving at speed, start hitting opened valves. Late-1985 CFI-equipped engines received a bump in power to 180 horsepower and 260 lb-ft of torque. If you are not sure about the type of engine your vehicle has, the list above is expected to help you identify it. But like any engine, its not without its problems. 1.3L Interference Yes! Yes, all 289/302/351 engines that I know of are definitely interference. $542.02. The engine is a SOHC design with two valves per cylinder. The Ford 4.0 an Interference Engine, meaning that the valves and pistons share the same space in the cylinder head. 1.6L (Chevette & 1000) Non-Interference The Ford 4.0 engine is a V6 engine that was first introduced in the 2006 model year. Posted on Aug 30, 2015 Not Helpful Comment Flag Testimonial: "Thanks, sounds like I better make time to do it myself." Ad Add Your Answer Video Ignition coils are responsible for providing a spark to the spark plugs, so if they fail, your engine will have difficulty starting or running smoothly. By clicking Accept All, you consent to the use of ALL the cookies. 2.4L DOHC Interference That saves a lot of time because you dont have to refer back to the component locator or circuit locations. With Ford, generally anything with a chain is gonna be interference. Registered. it had 220k before it blew but now im selling parts of which is still good which is quite a bit of them. At the same time, the valves will need to have a wider opening to improve airflow. 3.0L SOHC 12 Valve Engine Non-Interference In most cases, there is a bent valve if there is a large valve gap. 1.6L DOHC (4A-GE & 4A-GZE) Non-Interference Another common problem with this engine is intake manifold gasket leaks. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. They should have cut reliefs in the pistons for valve clearance of course. 3.8L Interference Mar 1, 2004. 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). I'm looking to do a full rebuild/engine build with mostly new parts. Support the engine with a jack and remove the drive belts. 2.4L DOHC Interference The camshaft was taken from a 351 Windsor engine that Ford used in their Torino and a double-roller timing chain replaced the previous silent-link chain. 850 Interference This is because vehicle manufacturers aim to make engines increase their efficiency. On the other hand, interference engines have a short space between the pistons and valves and when the . 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. Registered. 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. Non-Interference All Honda engines are interference except 3.0L & 3.2 which are Non-interference 1.8L 4 Cyl. 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. The 4.0L V6 Ford engine has been around for a while, powering everything from the Explorer to the F-150. 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. Necessary cookies are absolutely essential for the website to function properly. 2.6L Interference I have a 302 ('86 block, 28oz imbalance) with '65 289 heads (round pushrod. If youre tracking down a wiring issue, Eautorepair.net is the better choice. 2.4L DOHC Non-Interference (Valves may hit if camshafts turn out of time) 3.4L Non-Interference There is no interference in the Coyote V-8 engine, which has 302 ci. 3.0L Inline 6 (Except 1998 2JZ-GE) Non-Interference All Honda engines are Interference except 3.0L & 3.2 which are Non-Interference. 2.3L 4 Cyl. 3.0L DOHC Interference 2.3L SOHC Gasoline Non-Interference 2.0L SOHC Gasoline (Capri, Pinto & Ranger) Non-Interference All rights reserved. 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. What makes a car an interference or non interference engine? S60 Interference 1.8L DOHC (Storm) Interference, All Honda engines are interference except 3.0L & 3.2 which are Non-interference, 1.5L Interference . 2.5L V6 Interference 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. 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. Is the 302 in / 5.0 Liter an interference engine? 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. This cookie is set by GDPR Cookie Consent plugin. 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. Interference engines are four-stroke vehicle engines with fully open valves, such that the valves move towards any area that the piston travels. FK Non-Interference engine Ford 4.0 Sohc Timing Chain Replacement Without Pulling Engine. 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. The cookies is used to store the user consent for the cookies in the category "Necessary". Finally, another common problem with this engine is head gasket failure. Share. 1.5L Interference 2.0L Diesel Interference 2.2L DOHC Interference The engine block and cylinder heads were cast iron. This engine was rated at 118 horsepower and 193 lb-ft of torque. 1.8L Interference Which is Better Interference Or Non-Interference Engine? 3.0L Inline 6 VVT-i (1998 2JZ-GE) Interference If the timing belt or chain breaks, the valves can hit the pistons and cause severe damage. 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. 3.8L Interference, 2.0L 924 Turbo Interference The 4.0 OHV is a reliable engine, but it is known for consuming oil and developing valvetrain noise. Reply Like # 2 3.3L Interference It has a cast-iron block and aluminum heads. Does the 4.6 have cam phaser problems? 1.6L SOHC Non-Interference I have never had that happen but that doesn't mean it wont. 940 SOHC Non-interference 2.4L Diesel Interference The cookie is used to store the user consent for the cookies in the category "Analytics". The Ford 4.0 engine is a V6 engine that was first introduced in the 2006 model year. The 4.0 engine was replaced by the 3.5L Ecoboost engine in 2015 but remains available in some models. VW Beetle Sculpted Into A Sphere Cars as Art. Chassis dynos proved these flywheel ratings were mediocre! I will not however, rebuild the engine if there was piston to valve damage. If your engine interferes, it means that the valves and pistons share the same space in the cylinder. 3.5L DOHC Interference, 2.5L Non-Interference These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookies is used to store the user consent for the cookies in the category "Necessary". 1.6L 8 Valve Engine Non-Interference I hope this low performance, (185 HP @ 3800 rpm) engine uses dished pistons and low lift figures on the valves, while the Mustangs 302 HO (?) Technicians also have service manuals to check if the vehicle model features an interference or a non-interference engine. In 1968, small-block Ford dampeners became wider as a means of absorbing more harmonics in Ford's quest for a smoother engine. FORD 302 / 289 4.7L 5.0L V8 Master Engine Rebuild Kit w/ Stage-3 HP Camshaft. Necessary cookies are absolutely essential for the website to function properly. Is there a way to check the slack in the timing chain without pulling everything apart? Yes, all 289/302/351 engines that I know of are definitely interference. Not so with a non-interference engine. In 1984, Ford added its CFI or central fuel injection to the 4-speed automatic transmission Mustangs. Privacy Statement - Interference engines are typically more efficient than non-interference engines because they allow for a significantly higher compression ratio. Additionally, they prevent the piston from hitting the valves.