Technical data

Install the main bearings and connecting rod bearings to the
cylinder block and connecting rod respectively. Tighten bolts to
specification and measure the bearing I.D. Subsequently
measure the crankshaft journal and pin O.D. to obtain an oil
clearance. (A plasti-gauge may be used.) In case of excessive oil
clearance, replace the bearing. If the standard clearance cannot
be obtained even after replacement of the bearing, grind the
crankshaft undersize and install bearings of the same size.
W13 and W33: To remove the main bearing, install the guide
ring to the installer body as illustrated. Remove the main bearing from the bearing housing by
pushing from the front toward the rear. Also remove the main bearing from the rear of the
crankcase by pushing inward from the rear after the removal of the oil seal.
To install the main bearing, assemble the main bearing
to be installed, to the installer body and guide ring as illustrated, and the press in the bearing in the same
direction of removal. Insure any oil supply holes are properly aligned with oil galley holes in the block.
In W33 engines, main bearings are pressed in 1 mm deep below the crankcase surface. Be careful not to
confuse them with bearings for W13 engines.