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Yanmar 4JH4E - Main Bearing

Yanmar 4JH4E
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5. Inspection and servicing of basic engine parts
208
5.5.2 Main bearing
(1) Inspecting the main bearing
Check for flaking, seizure or burning of the
contact surface and replace if necessary.
(2) Measuring the inner diameter of metal
Tighten the cap to the specified torque and
measure the inner diameter of the metal.
Note:
When assembling the bearing cap, keep the
following in mind.
1) The lower metal (cap side) has no oil groove.
2) The upper metal (block side) has an oil
groove.
3) Check the cylinder block alignment number.
4) The “FW” on the cap lies on the flywheel
side.
mm
Inspection item Standard Limit
Crank journal
(Selective pairing)
Journal outside diameter 49.952-49.962 49.902
Metal inside diameter 51.000-51.010 -
Metal thickness 1.995-2.010 -
Clearance 0.038-0.068 0.150
Nm (kgf•m)
Tightening torque 96-100 (9.8-10.2)
Groove
Groove
Thrust metal
Main bearing cap
(Base)
Lower main
bearing metal
Upper main
bearing metal
Oil hole
Groove
011493-00E

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