Yanmar YM276 Service Manual page 138

Crankshaft, Main Bearings, and Flywheel
20-1 5-1 5
CRANKSHAFT INSTALLATION
TO BLOCK
Before installing crankshaft, clean each assembled component,
and prepare all cap screws.
1. Stand cylinder block upright, and lower crankshaft into block.
2.
Before completely installing. align set screw holes between
intermediate main bearing housing and block.
3. Lightly oil set screws.
4. Complete lower crankshaft into position and install inter.
mediate bearing housing set screws. Do not tighten yet.
5. Tighten set screw in bearing housing nearest flywheel first
(Thrust bearing housing) t o 73.5 Nm (7.5 kgm) (54.2 ft-lbs).
6. Tighten the remaining set screw t o 73.5 Nm (7.5 kgm) (54.2
ft.lbs1.
7. After tightening set screws, make sure the crankshaft rotates
smoothly.
8. When installing rear main bearing housing, make sure oil hole
in bearing housing and oil hole in block are aligned. The bolt
pattern i n bearing housing in not divided equally so that it
prevents incorrect installation.
9. Carefully place rear main bearing housing on block and tighten
cap screws t o 24.5 t o 26.5 Nm (2.5 t o 2.7 kgml (18.5 t o 19.5
ft-lbs).