Yanmar 4JH45 Especificações descarregar pdf (Página 72)

PERIODIC MAINTENANCE

66 JH Series Operation Manual

Figure 4

Note: 4JH110 shown.

1. Remove the belt cover.

2. Check the belt by pushing on the

middle of the belt (Figure 4, (1)) with

your finger. (Pressed by 100 N)

With proper tension, the belt should

deflect 8 to 9 mm.

Note: Check the tension of the

V-ribbed belt after operating the

engine at idle for 5 minutes.

3. Loosen the 3 bolts of alternator

(Figure 4, (2) (3) (4)).

4. Screw in the adjusting bolt

(Figure 4, (4)) and move the alternator

to adjust the belt tension properly.

5. Tighten the 3 bolts of the alternator.

6. Install the belt cover.

Inspecting V-Ribbed Belt

1. Visually check the belt for excessive

wear, frayed cords, etc.

If any defects are found, replace the

V-ribbed belt.

2. Check that the belt fits properly in the

ribbed grooves.

NOTICE

Confirm by hand that the belt has not

slipped out of the grooves on the bottom

of the pulley.

Checks on the rib side of the belt are

considered acceptable. If the belt has

chunks missing from the ribs, it should

be replaced.

Figure 1

Figure 5

Figure 2

Figure 6

Inspecting and Adjusting

Intake/Exhaust Valve Clearance

Proper adjustment is necessary to

maintain the correct timing for opening and

closing the valves. Improper adjustment

will cause the engine to run noisily,

resulting in poor engine performance and

engine damage. Consult authorized

Yanmar Marine dealer or distributor to

adjust the intake/exhaust valve clearance.

056901-00X00

8~9mm

037421-00X00

CORRECT

INCORRECT

037422-00EN00

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