Crankshaft thrust washers Mitsubishi 4G91 4G92 4G93 4G94

The Mitsubishi 4G91, 4G92, 4G93 and 4G94 four-cylinder engines

The 4G91, 4G92, 4G93 (naturally aspirated or 4G93-T) and 4G94 are Mitsubishi four-cylinder engines. They are fitted to the Mitsubishi Lancer, Colt, Mirage, Galant, Carisma, Space Star, Space Wagon and Pajero Pinin, and to the Proton Wira and Satria, among others. These Mitsubishi inline four-cylinder engines with a cast-iron block and 16-valve cylinder head displace 1.5 litres (4G91), 1.6 litres (4G92), 1.8 litres (4G93) and 2.0 litres (4G94).

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.

Technical specifications

Technical guide

Each half washer has lubrication grooves on one face. This face fits on the crankshaft side, with the smooth face towards the block or cap. Fitted the wrong way round, the washer deprives the crankshaft bearing face of lubrication and wears it quickly.

Before fitting, coat the crankshaft-side face with assembly grease. Check that the half washers in the block sit flush, fit the cap without forcing it and tighten it following the manufacturer's procedure. Then check the end play with a dial gauge and compare it with the manufacturer's value.

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 the Mitsubishi 4G91, 4G92, 4G93 and 4G94 four-cylinder engines (engine codes 4G91, 4G92, 4G93, 4G93-T and 4G94) of the following vehicles: