Yanmar 1GM10 Operation Manual page 57

4. After approximately 10 minutes, stop
the engine and check the oil level. Add
oil if the level is too low.
Checking and Adjusting the
Alternator V-Belt Tension
Inadequate V-belt tension will cause
reduced electrical power generation and
increase the wear on the belt. Too much V-
belt tension can cause damage to the
alternator bearing.
NOTICE: NEVER get any oil on the
belt. Oil on the belt causes slipping and
stretching. Replace the belt if it is
damaged.
WARNING! Perform this check with the
engine off and the key removed to avoid
contact with moving parts.
1. Inspect the V-belt for any damage or
wear and replace it if necessary.
2. Find a location on the belt that is in the
middle of the two pulleys.
3. Check the tension by pushing on the
middle of the belt.
With proper tension, the belt should
deflect 8 to 10 mm (approximately
3/8 in.).
4. Loosen the alternator bolt and move the
alternator to adjust the V-belt tension,
as required.
5. Hold the alternator in position and
tighten the bolt.
6. Recheck tension by repeating step 3.
Inspecting and Adjusting the
Intake / Exhaust Valve Clearances
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.
See your authorized Yanmar Marine dealer
or distributor to adjust the intake / exhaust
valve clearances.
GM Series Operation Manual
Inspecting and Adjusting the
Throttle and Shift Control Cables
Various control levers and cables on the
engine and marine gear are connected to
the throttle and shift control console. The
entire assembly loosens and stretches with
prolonged use and initial break-in
movements. It is dangerous to operate
under these conditions. The throttle and
shift control console should always be
maintained in proper adjustment and should
be inspected periodically.
NOTICE: The high speed stop bolt on the
engine governor is set at the factory. Do
not adjust. Adjustments to this bolt will
void the engine warranty.
Adjusting the Governor Control Cable
1.
2.
3.
4.
If adjustment is needed, loosen the bracket
that holds the control cable and adjust its
position as necessary. Adjust the high
speed position first and then the low speed
position. NOTICE: The high speed stop
bolt on the engine governor is set at the
factory. Do not adjust. Adjustments to
this bolt will void the engine warranty.
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE
With the engine off, move the throttle
lever to the high speed position.
Check the governor control lever on the
engine and verify that the lever is
making contact with the high speed
stop bolt.
Move the throttle lever to the low speed
position.
Verify that the governor control lever on
the engine is in contact with the low
speed stop bolt.
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