Yanmar 3JH4E Service Manual page 53

(7) Retighten all major nuts and bolts.
Retighten the major nuts and bolts bellow by the standard tightening torques. (See the table in 4.5.)
1) Cylinder head bolts
2) Crankshaft pulley bolts
3) Fuel injection nozzle set bolts
4) Fuel pump gear set bolts
5) Fuel injection line sleeve nut
Retighten the following major bolts as requested.
1) Rod bolts
2) Flywheel set bolts
3) Metal cap bolts
(8) Adjust intake/exhaust valve clearance.
Refer to 2.2.2(5) for the procedure.
(9) Check/adjust the remote control operation.
Refer to 2.2.2(6) for the procedure.
(10) Adjust the propeller shaft alignment.
1) The rubber tension of the flexible engine mounts is lost after many hours' use. This leads to a drop
in vibration absorption performance, and also causes centering misalignment of the propeller shaft.
(Refer to 5. "Flexible Engine Mount" in the installation manual for pleasure boat use.)
Be sure to replace the Yanmar flexible engine mounts every 1000 hours or 4 years,
whichever comes first.
2) After replacing the flexible engine mounts, check unusual noise and vibration of the engine and the
boat hull with increasing the engine speed gradually and lowering it.
3) If there is unusual noise and/or vibration, adjust the propeller shaft alignment. (Refer to 6.4.5
"Centering the Engine" in the installation manual for pleasure boat use.)
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2. Inspection and Adjustment