Installation manual

ENGINE ADJUSTMENTS
NOTE: WESTERBEKE recommends that the following engine adjustments
be peiformed by a competent engine mechanic. The information below is
provided to assist the mechanic.
DRIVE BELT ADJUSTMENT
Excessive drive belt tension can cause rapid wear of the belt .
and reduce the service life
of the fresh water pump's bearing.
A slack belt or the presence of oil on the belt can cause belt
slipping, resulting in high operating temperatures.
The drive belt
is properly adjusted if the belt can be
deflected
no less than 3/8 inch (lOmm) and no more than 112
inch (12mm) as the belt is depressed with the thumb at the
midpoint between the two pulleys on the longest span
of the
belt. A spare belt or belts should always be carried on board.
A WARNING: Never attempt to check or adjust the
drive belt's tension while the engine is in operation.
Adjusting Belt Tension
TORQUING THE CYLINDER HEAD BOLTS
After the initial break-in period (approximately 50 hours) and
every
500 hours thereafter, the cylinder head bolts should be
re-torqued.
Tighten the cylinder
head bolts according to the sequence
shown. Make sure the engine is cold when this is done.
Before applying the specified torque to the bolt, loosen it
114
to 112 of a tum and then apply the torque. Follow this pro-
cedure according to the numbered sequence shown in the
illustration to the right.
Bolts
#1 and #2, (12rnm socket)(14 - 22 ft-Ib.
Bolts #3, 4, 5, 6,
7,8 (l4mm socket) 54 - 61 ft-Ib
Rockershaft Hold
Down Bolts - (12mm socket) 11 - 16 ft-Ib.
1. Loosen the pivot belt that holds the idler sheave and
loosen the adjusting bolt.
ENGINE FRONT
2. With the belt loose, inspect for wear, cracks and frayed
edges.
3. Pivot the idler sheave to the left or right as required, to
loosen or tighten.
4. Tighten the pivot bolt anp the adjusting bolt.
5. Operate the generator for about 5 minutes and then shut
the generator down and recheck the belt
tension.
ADJUSTING BOLT
IDLER SHEAVE
TORQUE
DIAGRAM
ENGINE COMPRESSION
Check the engine's compression pressure at 600 operating
hours or whenever engine performance is reduced. Remove
each glow plug and check each cylinder's compression
pressure. The engine's cranking speed is at
280 rpm.
Compression values:
Standard
397.6 psi (28 kg/cm2)
Minimum
312.4 psi (22
kg/cm2)
The maximum acceptable difference between cylinders is
35.5 psi (3.5 kglcm2).
TESTING OIL PRESSURE
Oil pressure will vary depending on the engine temperature
and the load placed
on the generator, If you suspect an oil
pressure problem, remove the oil pressure switch and install
a mechanical gauge in its place. After allowing the generator
to warm up, read the gauge and it should indicate about
50
psi and steady at 3600 (or 3000) RPM.
Engines & Generators
32