Assembling Main Ball Bearing; Assembling Crankshaft And Crankcase - Bosch PB-650 Service Manual

PB-650
PB-750

8-12 Assembling main ball bearing

8-13 Assembling crankshaft and crankcase

1K363
ENGINE
1. Heat bearing housing of crankcase to 1 10°C
(230°F) for easier installation of main ball bearing.
2. Apply thin coating of Loctite #675 in circumfer-
ence of the bearing housing. Do not apply the Loctite
too much, or the Loctite flows inside the ball bear-
ing and damage the bearing.
NOTE : After applying Loctite, move next process
quickly, because the Loctite would be dried by
heated crankcase.
3. Insert ball bearing using bearing tool set 897701-
14732 without inclining the ball bearing as shown.
1. Clean the mating surface of each crankcase half.
2. Insert the crankshaft starter end into the starter
(A) side of the crankcase half until properly seated. If
hard to insert, gently tap at the other end with a plas-
tic mallet.
3. Put a new crankcase gasket (A) on the fan case
side crankcase half.
4. Reassemble both crankcase halves together
ensuring that dowel pins on the crankcase half are
properly seated in holes another half.
5. Tighten four bolts to secure the crankcase halves
together and check crankshaft rotation.
NOTE: The torque differences among four bolts
(B)
should not exceed 20kgf•cm(17in•lbf).
6. Remove an excessive protruding portion of
crankcase gasket (B) with a sharp knife carefully.
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