Engine Adjustments; Drive Belt Adjustment; Torquing The Cylinder Head Bolts - Westerbeke 7.6 kw EDT Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine adjust-
ments be perfonned
by
a competent engine mechanic. The information
below is provived to assist the mechanic.
DRIVE BELT ADJUSTMENT
'For your safety, WES1ERBEKE generator models come
equipped with belt guards that cover over the belt(s) on the
front of the engine. ("Out of sight - out of mind." The belt
guard is NOT installed for that purpose.) Operators are
advised that proper inspection, service, and maintenance is
required.
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 c"" be
deflected no less than 3/8 inch (IOmm) and no more than 1/2
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
1. Remove the belt guard.
2. Loosen the pivot belt that holds the idler sheave and
loosen the adjusting bolt.
3. With the belt loose, inspect for wear, cracks and frayed
edges. '
4. Pivot the idler sheave to the left or right as required, to
loosen or tighten.
5. Tighten the pivot bolt and the adjusting
bolt.
6. Replace the guard. Operate the generator for about 5
minutes and then shut the generator down.
7. Remove the guard and recheck the belt tension.
_ 8. Replace the guard.
-'-"--
.
-
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, 10?§efl·if
114 to 1/2 of a
turn
and then apply the torque,l'ollow this
procedure according to the numbered sequence shown in the
illustration to the right.
Bolts #1; 2 and 3, (12tDmsocket) 14 - 22 ft-Ib
Bolts #4, 5, 6, 7, 8, 9,
10
and
11
(14mm socket) (54 - 61 ft-Ib)
Rocketshaft Hold Down Bolts - 12mm socket (II - 16 ft-Ib)
Rocker Cover Hold Down Cap Nuts - (IOrnrn socket) (snug)
CYLINDER HEAD BOLT PATTERN
/FUEL INJECTORS
In
case of severe vibrations and detonation noise, have the
injectors checked and overhauled by an authorized fuel
injection service center. Poor fuel quality, contaminant's and
loss of positive fuel pressure to the injection pump can result
in injector faults. Since fuel injectors must be serviced in a
clean room environment, it is best to carry at least one extra
injector as a spare should a problem occur.
Before removing the old injector, clean the area around the
base of the injector to help prevent any mst or debris from
faJling down into the injector hole. If Ihe injector will not
lift
out easily and is held in by carbon build-up or the like, work
the injector side-to-side with the aid of the socket wrench to
free it, and then lift it ant.
The injector seats in the cylinder head on a copper sealing
washer. This washer should be removed wilh the injector and
replaced with a new washer when Ihe new injector is
installed. ' ,
START TO INJECTION PRESSURE
1988
±
142PSI (140
±
10KG/CM')
NOTE:
Refer to the mel iniector page in this manual for
additional information.
-.,yo
WESTERBEKE
Engines'-& Generators
23