TOHATSU MFS 6C, Руководство по обслуживанию

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5
5-13 4st 4/5/6 2011
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 plat
1
(of stop switch lanyard) from stop
switch.
6. Fully open throttle, crank engine until compression gauge
2
indication stabilizes, and then measure compression
pressure.
4. Remove all plug caps and then all spark plugs.
5. Install compression gauge
2
to plug hole.
2
Compression Pressure (Reference) :500 r/min
With decompressor : 0.34 MPa (49.3 psi) [3.5 kgf/cm 2 ] ± 10%
Without decompressor : 0.93 MPa (137.8 psi) [9.5 kgf/cm 2 ] ± 10%
(*Remove Exhaust rocker arm)
1 1
CAUTION
Remove lock plate (of stop switch lanyard)
f r o m s t o p s w i t c h b e f o r e m e a s u r i n g
compression pressure. This will prevent
engine from accidental starting.
CAUTION
Clean areas around spark plugs on the
cylinder before removing spark plugs to
prevent dirt from entering cylinder.
Compression gauge
2
:
P/N. 3AC-99030-0
7. If compression pressure is below specified value, put
small amount of engine oil into cylinder, and perform the
test again.
· If compression pressure increases after the
above measure, check pistons and piston rings
for wear. Replace if necessary.
· If compression pressure does not increase
after the above measure, check valve
clearances, valves, valve seats and cylinder
sleeves. Adjust or replace if necessary.
· Compression pressure is affected much by
cranking speed, and normally changes
approximately 10%.
· Do not pull choke knob when measuring
compression pressure.
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