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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