Adjust Alternator V-Belt Tension - Yanmar 6LY3 series Operation Manual

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.
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.
6LY3 Operation Manual
Back
1. Check the tension of the V-belt by
2. If the V-belt deflection is out of the limit,
3. If the V-belt is damaged or worn,
0000010en6LY3
4. Install new belt per routing (Figure 5)
PERIODIC MAINTENANCE
Figure 5
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).
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.
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.
replace it. Loosen the adjuster bolt
(Figure 5, (2)) and move the alternator
(Figure 5, (3)). Remove belt from
pulleys.
and adjust the tension as shown in
Step 2.
2
1
3
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