Specifications

PERIODIC MAINTENANCE
YM Series Operation Manual 63
12/05
1. Remove the belt cover.
2. Check the belt by pushing on the
middle of the belt (Figure 3, (1)) with
your finger.
With proper tension, the belt should
deflect 8 to 10 mm (approximately
3/8 in.).
3. Loosen the 3 bolts of alternator
(Figure 3, (2) (3) (4)).
4. Screw in the adjusting bolt
(Figure 3, (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 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.
Checking and Adjusting the Remote
Control Cables
NOTICE
Never adjust the high-speed stop bolt
(Figure 4, (4)) on the governor. This will
void the engine warranty.
The various control levers on the engine
side are connected to the remote control
lever by remote control cables. The cables
will become stretched and the attachments
loose after long hours of operation. It is
dangerous to control operation under
these conditions, and the remote control
cables must be checked and adjusted
periodically.
Adjusting the Throttle Remote Control
Cable
Figure 3
Figure 4
1–Cable
2 – Fuel Injection Pump
3–Adjustment
4 – High-Speed Stop Bolt
5 – Low-Speed Stop Bolt
6 – Control Lever
1
2
3
4
5
6
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