Don’t reuse the old sprockets to save time or money. When replacing a timing chain on any Ford engine, always replace the chain, camshaft and crankshaft sprockets. The two DOHC timing chains and guide assemblies should also be replaced at the same time. These include two timing chain tensioners F5RZ-6L266-CA, the left hand tensioner adapter F5RZ-6C275-BA, the right hand tensioner adapter F5RZ-6C275-AA, the left hand chain tensioner arm F6RZ-6L253-AA and the right hand chain tensioner arm F6RZ-6L253-BA.
The cure, says Ford, is to replace the original chain tensioner components with redesigned parts. The noise only lasts a couple of seconds and goes away as soon as the engine builds up oil pressure. Oil leaking out of the chain tensioners causes the timing chain to momentarily rub against the tensioner ratchet when the engine is first started. If the timing chain has worn through the tensioner arm into the tensioner piston, remove the oil pan from the engine and clean the debris from the oil pickup tube.įord TSB 97-2-8 describes a clattering noise at engine start-up after the engine has sit overnight that may be heard on 1995 Ford Contour and Mercury Mystique models with a DOHC 2.5L V6. The tension arms are 1L2Z-6L253-AA (RH) 1L2Z-6L253-AA (LH).įord also recommends changing the oil and filter to flush any nylon and aluminum particles from the crankcase. For the 2001 to 2003 model years, the tensioner part numbers are 1元Z-6L266-AA (RH) and XL1Z-6L266-AA (LH). The Ford part numbers for the 2000 model year tensioners are F6AZ-6L266-DA (RH) and F6AZ-6L266-CA (LH). So if you find nylon and/or aluminum particles in the engine oil, it probably means the tensioner, tensioner arms, timing chains and gear set all need to be replaced. The tension arm has an aluminum base with a nylon surface. According to Ford Technical Service Bulletin 03-15-7, excessive wear in the timing chain tensioner arms can cause a noisy condition. Timing chain noise can also be caused by other problems as well.Ī case in point is grinding noise coming from the timing chain cover area in 2000 to 2003 Ford Crown Victoria and Mercury Grand Marquis with the 4.6L V8. Even so, timing chains do stretch with age and may cause noise, retarded valve timing and/or ignition timing. Chains are longer lived than most timing belts, and there are no recommended chain replacement intervals published by Ford for these engines. This includes everything from the older 289/302/351 pushrod V8s to the latest OHC 4.6L and 5.4L V8s. The rest of Ford’s powerplants rely on timing chains to keep the camshaft and valves moving. If the car is a Probe or an older Escort with an interference engine, the engine won’t even crank because the valves will be smack up against the pistons. The only sound they hear is the frustrating wheezes from an engine that cranks but won’t start because it has no compression. One minute the engine is running fine and the next it is deader than a dodo bird. There is usually no noise or other symptoms to warn a motorist that their timing belt has reached the end of the road. The belt may still look good as new on the outside but inside the cords have lost tensile strength and may be on the verge of failure. As a belt ages, the reinforcing cords that hold the belt together weaken. The main thing to keep in mind about timing belts is that belt failures often happen with no warning whatsoever. On the older cars, the cost to repair the damage may be more than the vehicle is worth – which means your customer has to make a painful decision either way. The same goes for the Mazda-built 3.0L V6 in the Mercury Villager. But on older Escorts (up to 1985) with 1.6L engines as well as 1989 and up Probes with 2.0L or 2.2L four cylinder engines, a timing belt failure will usually bend a bunch of valves. Fortunately for many Ford owners, there is enough clearance between the valves and the pistons so no harm will come to the engine if the belt snaps. The consequences of a timing belt failure on a Ford depend on the application.
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