Rated in ~ a rather anemic 210 horsepower, the 4.0L SOHC V6 is not specifically a high output engine. It additionally has an unexplained overhead camer drive setup. Unlike most other OHC V6 and V8 engines that drive both overhead cams directly from the crankshaft with a belt or chain, this engine has actually an intermediate jackshaft in the center of the block whereby a pushrod electronic came would normally be located.

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Unlike many other OHC V6 and also V8 engines that drive both overhead cams straight from the crankshaft v a belt or chain, this engine has an intermediate jackshaft in the middle of the block wherein a pushrod cam would usually be located.

A short timing chain top top the prior of the engine connects the crankshaft to the intermediary jackshaft. A second, much longer timing chain behind the first chain connect the former of the jackshaft come the overhead camer on the left next of the engine.
A third timing chain in the back of the engine associate the behind of the jackshaft come the overhead video camer in the right cylinder head. Over there is also a balance tower in the crankcase the engines supplied in 4×4 trucks, which is driven by a fourth chain straight off the crankshaft.

Why Ford design the cam drives this means is anyone’s guess. The probably permitted the engine come be much shorter and much more compact. Yet one of the unintended aftermath of this fore-and-aft break-up cam drive setup is the it makes the time chains, guides and tensioners VERY an overwhelming to replace — which provides for an high value repair as soon as a chain overview or tensioner fails on among these engines (a typical problem top top high purpose of use engines, particularly if the owner has ­neglected continual oil changes).

TIMING CHAIN PROBLEMSSome that the early engines up v 2002 in the Ranger and Explorer have had actually a time chain rattle problem due to the poor architecture of the initial teflon chain guides. The noise is most noticeable once a cold engine is very first started, and is commonly loudest indigenous 2400 to 3000 rpm.


The same noise problem can additionally develop in 2003 and newer high-mileage engines together a an outcome of chain guide wear. In some instances, the guide may break and also disintegrate and also spew debris into the oil pan. This may additionally cause one of the time chains to rest (typically the former left chain).
Fortunately, the 4.0L SOHC is no an interference engine so a timing chain failure won’t bend the valves. Yet it does develop an high-quality repair for the car owner.

Ford authorize a TSB for the time rattle problem and also released a redesigned “‘cassette”‘ (the time chain, gears, guide and also tensioner assembly) for the left front time chain. This time chain cassette deserve to be replaced without having actually to pull the engine out of the vehicle.

But, if the engine has a negative rear chain or guide, or a chain overview has failed and throws debris into the crankcase, you will need to remove the engine to make the required repairs. That has removing the flywheel and flexplate so the the rear camer drive cassette deserve to be replaced, and pulling the oil pan so any kind of debris in the oil pan and also oil pickup display can be cleaned out.

You’ll also need a special device kit (Ford or aftermarket) to host the cams and also tension the timing chains, and to protect against the crankshaft indigenous rotating when you’re act the electronic came drives. You’ll likewise need the ideal puller to get the harmonic balancer off the crankshaft.


The redesigned Ford primary timing chain service kit includes an boosted chain tensioner and also chain guide, chain, jackshaft and sprockets. Kit number 2U3Z-6D256-AA is for balance column engines in 1999 come 2001 4×4 Explorer/Mountaineer, 2001 come 2002 4×4 Sport/Sport Trac and all 2002 Explorer/Mountaineer (except engine codes 2G-960-AA and also 2G-964-AA). Kit number 2U3Z-6D256-BA is because that non-balance shaft engines in 1999 come 2001 2WD Explorer/Mountaineer and 2001 to 2002 2WD Sport/Sport Trac, and also all 2001 to 2002 Ranger.
ENGINE SERVICEIf the head gasket is leaking, instead of the left head gasket deserve to be done v the engine in the automobile (assuming over there is enough room to pull the head). But if the right head has to come off, the only way to remove the head is v the engine the end of the auto because the the rear electronic came drive top top the ideal head.

At this point, some might argue the it’s cheaper and also easier to simply uncover a great used engine and also replace the old motor fairly than repair it. This might be a viable different IF you can discover a great used low-mileage 4.0L SOHC V6 that can be swapped into your customer’s vehicle.


But through the time numerous of these engines end up in a salvage yard, they don’t have a the majority of miles left in them. A far better option if her customer is ready to spend the money would certainly be to download a remanufactured engine. A reman engine indigenous a reputable supplier need to be totally reconditioned to initial specifications and also come with an extended warranty.
On part 2005-’10 Mustangs with automatic transmissions, there have the right to be an stroked nerves vibration in ~ idle, especially when the A/C is on. The difficulty is no the engine, however an exhaust ­vibration. Ford TSB 05-8-6 states the healing is to install a damper kit to dampen the annoying vibration. The kit is P/N 5R3Z-5F240-A.


The original equipment spark plugs room platinum through a 100,000-mile company interval. Make sure you install the correct replacement plugs since the ones because that the 4.0L OHV pushrod engine are much shorter and won’t position the electrode the exactly distance right into the burning chamber.

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Though Ford diehards tend to stick with the initial Motorcraft brand spark plugs, any type of brand the spark plug will work in this engines detailed the plug manufacturer has actually a listing for the engine application. The plug gap is 0.054” on many applications.