Crankshaft thrust washers Leyland A Series 76 mm

Leyland A Series engines

The A Series are Leyland four-cylinder engines (engine codes A Series, 12YD and 12YE). Built from 1951 to 2000, this family is an inline four-cylinder with a cast iron block, overhead valves and a chain-driven camshaft in the block.

Thrust washers

Thrust washers take the clutch thrust and set the crankshaft end play. On a tuned engine with a reinforced clutch, this thrust increases. The uncoated ACL version restores the thrust washers to the original size.

These half washers set the limits of the crankshaft's movement along its axis. They take the thrust transmitted by the clutch at every disengagement and must withstand it without seizing. As they wear, end float increases, the crankshaft gains movement and its thrust faces deteriorate.

Technical specifications

Technical guide

Each half washer has a grooved face, which ensures its lubrication, and a plain face. The grooved face goes on the crankshaft side, the plain face on the block or cap side: fitted upside down, the washer no longer feeds oil to the crankshaft's thrust face, which deteriorates rapidly.

Coat the face turned towards the crankshaft with assembly grease, check that the half washers sit flush in the block, offer up the cap without forcing and tighten it as the manufacturer specifies. An end float check with a dial gauge, compared with the manufacturer's value, validates the assembly.

The brand

ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, supplies uncoated thrust washers for these engines.

Construction and advantages

Vehicle compatibility

These thrust washers fit Leyland A Series engines (engine codes A Series, 12YD, 12YE) of the following vehicles: