Tohatsu MFS 30 — как проверить компрессию двигателя: пошаговое руководство [134/319]

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5. Install compression gauge to plug hole.

5-18

Power Unit

25/30 2006

3. Inspection Items

1) Inspection of Compression Pressure

1. Run engine 5 minutes to warm up, and then stop.

2. Shift gear into neutral (N).

3. Remove lock plate from stop switch.

6. Fully open throttle, crank engine until compression gauge

indication stabilizes, and then measure compression

pressure.

7. If compression pressure is below specified value or varies

among cylinders, put small amount of engine oil into

cylinders, and perform the test again.

CAUTION

Clean areas around spark plugs on the

cylinder before removing spark plugs to

prevent dirt from entering cylinder.

CAUTION

Remove lock plate from stop switch before

measuring compression pressure. This will

prevent engine from accidental starting.

Compression Gauge 1 :

P/N. 3AC-99030-0

Compression Pressure (Reference) :

1.13 MPa ( 164 PSI ) [ 11.5 kgf/cm

] ±10 %

• If compression pressure of a cylinder

increases after the above measure, check

pistons and piston rings of the cylinder for

wear. Replace if necessary.

• If compression pressure does not increase

after the above measure, check valve

clearances, valves, valve seats, cylinder

sleeves, cylinder head gaskets and cylinder

head. Adjust or replace if necessary.

Compression pressure is affected much by cranking

speed, and normally changes approximately 10%.

4. Remove all plug caps and then all spark plugs.

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