Crankshaft thrust washers Mitsubishi 4B11T

The Mitsubishi 4B11T four-cylinder engine

The 4B11T is a 2.0-litre turbocharged Mitsubishi four-cylinder engine with double overhead camshafts and 16 valves. It powers the Lancer Evolution X and the Lancer Ralliart (saloon and Sportback). This engine has a die-cast aluminium block, MIVEC variable valve timing on both intake and exhaust and a timing chain; its exact displacement is 1998 cc.

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 this engine.

Construction and advantages

Vehicle compatibility

These thrust washers fit the Mitsubishi 4B11T four-cylinder engine (engine code 4B11T) of the following vehicles: