Technical modifications: Crank assembly Engines 601, 602 (except 602.98), 603

Designation

Nature and reason for modification

Production breakpoint

Op. no.

Matching pistons - cylinders

Piston and cylinder 

Engine 602.982

as of

start of production

03-316

Pistons
Engine 603.97

With semi-cooling gallery and modified piston rings

as of 03/95

03-317

Pistons
Engine 602.982

With DI bowl

as of

start of production

03-317

Matching crankshaft

bearing shells

Enlarged by the colors

white and purple

10/93

03-320

Crankshaft belt pulley

With vulcanized vibration damper

Engine 601 in model 124

09/94

03-324

Crankshaft belt pulley

With vulcanized vibration damper

Engine 602 in model 210

as of

start of production

03-324

03-341

Flywheel securing bolt

Straight stretch shank bolt with modified tightening torque in place of stretch shank bolt

07/94

03-410

Flywheel securing bolt

Torx bolt in place of straight stretch shank bolt

05/95

03-410