by Pat Martin
David Paul Morris / Getty Images News / Getty Images
A list of Ford interference engines includes engines manufactured between 1981 and 1995 with pistons near the intake valves. If the timing belt broke, the pistons bent the intake valves and disrupted the timing of the camshaft and crankshaft.
The original Escort was powered by a 69-horsepower 1.6L 4-cylinder engine with a twin-cylinder carburetor. The single camshaft engine had a compound angle combustion chamber to increase torque and power. The Escort was recalled multiple times due to cylinder head gasket failure because the engine had an aluminum engine attached to an iron engine block. Interference between head gasket, pistons, and valves occurred from 1981 to 1985 on the 1.6L and 2.0L Escorts.
The Ford Lynx was the Mercury version of the Ford Escort. The Escort and the Lynx had essentially the same engine. From 1981 to 1983, the Lynx had a 1.6L LN7 jamming engine. From 1984 to 1987, Ford Mercury released the Lynx 2.0L interference engine, which would stop working if the timing belt broke. The timing belt had to be replaced every 60,000 miles to make sure it didn’t break.
Examining the Ford Ranger’s timing belt was not easy because it was covered. Timing belts with cracks or frayed cords had to be replaced. Timing belts squealed before breaking. If the timing belt broke, the engine stopped when the pistons hit the valves. The 2.0L and 2.3L Ranger from 1986 to 1988, the 2.2L Ranger from 1985, and the 2.3L Diesel Ranger from 1986 to 1987 were interference engines.
The timing belt deteriorates as the engine ages. The camshaft gears deteriorate. The chain stretches and the timing belt gets thinner. Timing slows down or you hear camshaft noise as the engine ages. From 1989 to 1992, the 2.2L Probe and from 1993 to 1995, the 2.0L Probe had interference engines.
Ford Crown Victoria
The Ford 4.6L Crown Victoria had an interference engine from 1991 to 1998. A thick, looking tough timing belt should be replaced if the belt is old because the threads weaken over time.