Yanmar 3HM Manual do Utilizador descarregar pdf (Página 48)

[9-4.] Inspection of engine body

1) Retightening cylinder head nuts Retighten each nut with a torque wrench before starting a

new engine and after 50 hours of operation. Sequence for tightening the nuts is shown in the

figure.

1. For 1GM M10 bolts are used for main

2. Sub

3. Number shows tightening order

CYLINDER HEAD TIGHTENING TORQUE

1GM MAIN (M10) 7.5 kg-m

2GM, 3GMD MAIN (M12) 10 kg-m

SUB (M8) 2.5 kg-m

3HM MAIN (M12) 13 kg-m

SUB (M8) 3 kg-m

2) Exhaust/intake valve head clearance adjustment

The clearance of the valve will affect the overall performance

of the engine, so it is important that it be correctly adjusted.

Check the clearance before starting a new engine, whenever

assembling or disassembling and after 500 hours of

operation. Adjustment shall be done while the engine is cold.

2-a)

Remove the valve rocker arm cover and starter motor.

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Yanmar 3HM Manual do Utilizador Página 48