Yanmar 6LY3 series, Operation Manual

Page: 111 / 136

PERIODIC MAINTENANCE
6LY3 Operation Manual
103
Adjust Alternator V-Belt
Tension
When there is not enough tension in the
V-belt, it will slip and the fresh water pump
will fail to supply coolant. Engine
overheating and seizure will result.
When there is too much tension in the
V-belt, the belt will become damaged more
quickly and the fresh water pump bearing
may be damaged.
Figure 5
1. Check the tension of the V-belt by
pressing on the middle of the belt
(Figure 5, (1)) with your finger
approximately 98N, 10kgf (22 lbf).
With proper tension, the V-belt should
deflect 8 - 10 mm (0.315 - 0.393 in).
2. If the V-belt deflection is out of the limit,
adjust the V-belt tension. Loosen the
adjuster bolt
(Figure 5, (2)) and move
the alternator (Figure 5, (3)) to adjust
the V-belt tension.
3. If the V-belt is damaged or worn,
replace it. Loosen the adjuster bolt
(Figure 5, (2)) and move the alternator
(Figure 5, (3)) . Remove belt from
pulleys.
4. Install new belt per routing (Figure 5)
and adjust the tension as shown in
Step 2.
A
WARNING
SEVER HAZARD!
• Stop the engine before you
begin to service it.
• ALWAYS turn off the battery
switch when you are servicing
the engine. Someone may
accidentally start the engine
and not realize you are
servicing it. This could result
in a serious injury.
• If you must service the engine
while it is operating, remove all
jewelry, tie back long hair, and
keep your hands, other body
parts and clothing away from
moving / rotating parts.
• Failure to comply could result
in death or serious injury.
0000010en6LY3
CAUTION
Be careful not to get any oil on
the V-belt. Oil on the belt causes
slipping and stretching. Replace
the belt if it is damaged.
2
3
1
0002077A
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