Mitsubishi S4Q, User Manual

Page: 77 / 174

77 / 174 Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
PISTONS, CONNECTING RODS,
CRANKSHAFT AND CRANKCASE
ENGLISH
ENGINE MAIN PARTS
2) Install the upper and lower halves of the main
bearing having flanges in the crankcase and
main bearing cap for No.5 journal of the
crankshaft.
3) Lightly coat the inside surface of the shells
with engine oil.
3. Installing crankshaft
1) Wash the crankshaft with cleaning solvent and
blow dry with compressed air. Make sure all oil
holes in the crankshaft are clean. Check the
oil holes for condition.
2) Hold the crankshaft in a horizontal position by
using a hoist, and carefully put it in the
crankcase.
3) Lightly coat the journals with engine oil.
4. Installing main bearing caps
Install the main bearing caps in position so the
“front” mark (arrow) on the cap is toward the front
of the engine and the number on the cap is the
same as the number on the crankcase on the left
side of each main bearing cap.
5. Tightening main bearing cap bolts
Tighten the main bearing cap bolts evenly to the
specified torque.
Figure 138 Installing crankshaft
Figure 139 Installing main bearing caps
Cap number
Front of
engine
Flush
“Front” mark
NOTE
The end faces of No.1 and No.5 bearing caps must
be flush with the end faces of the crankcase.
Figure 140 Tightening main bearing cap bolts
Tightening torque
83 ± 5 N·m
(8.5 ± 0.5 kgf·m)
[61 ± 4 lbf·ft]