Timing Belt Inspection And Replacement - Westerbeke 55A FOUR Operator's Manual

ENGINE ADJUSTMENTS
(Continued)
TIMING BELT INSPECTION AND
REPLACEMENT'
1. Before removing the timing belt and timing belt
tensioner, rotate the engine crankshaft by hand and
align the three timing marks as shown in the
illustration.
A
CAUTION: After removal of the timing belt,
DO NOT rotate the crankshaft or camshaft; the
pistons will damage the opened valves.
~nM"G.AA~
TIMING
MARKS
NOTE:
If the timing belt is to be reused, draw an arrow on
the belt pointing in the direction of the belts rotation.
Replace it in the same direction.
DIRECTION
ARROW
Inspection
1. Replace the timing belt if it is contaminated with oil,
grease or water.
2. Check for damage, wear, peeling, cracks or
hardening. Replace if suspect.
NOTE: Never forcefully twist the timing belt; turn it inside
out or bend it.
Timing Belt Tensioner
1. Check the rotation of the timing belt tensioner pulley.
Check for play or abnormal noise.
NOTE:
Do not clean the timing belt tensioner with clean-
ing solvents.
If
dirty, use a clean rag to wipe it clean.
Avoid scratching the suiface the belt travels over.
OAMAGE,/
WEAR
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OAMAGE,
WEAR
Timing Belt, Camshaft And Injection Pump Gears
1. Check the gear teeth for any indication of damage,
wear, deformation, etc. Replace if any faults are
found.
Timing Belt Installation
1. Check to ensure that the timing marks on the gears
are properly aligned with the marks on the case.
2. Loosely install the timing belt tensioner, locking bolt
and spring. Push the timing belt tensioner toward the
lock bolt to the left as far as it will go and then tighten
the locking bolt to temporarily hold the tensioner
in place.
LOCKING
BOLT
TIMING BELT
TENSIONER
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WESTERBEKE
I
Engines & Generators
24