Engine Adjustments; Spark Plugs; Drive Belt Adjustment - Westerbeke 20.0KW SBEG Operator's Manual

ENGINE ADJUSTMENTS
SPARK PLUGS
The spark plugs should be cleaned and re-gapped after the
first 50 hour break-in period, then inspected every 250 hours
thereafter and replaced as needed.
A
WARNING:
Do not remove the spark plugs while
the engine is hot. Allow the engine
to
cool before
removing them.
SPARK PLUG GAP: 0.031 - 0.002in. (0.8· 0.7mm).
SPARK PLUG TORQUE: 11 -15
Ib-fl
(1.5 -2.31
kg-mI.
NOTE: !.octite Anti-Seize applied to the threaded portion of
the spark plugs will retard corrosion, making future removal
of the spark plugs easier.
CHECK FOR DETERIORATION
~
INSPECTING
THE SPARK
PLUGS
CHECK FOR CARBON
~BUlLD
UP AND BURNING
- i
GAP
HIGH TENSION CORDS (IGNITION WIRES)
Check the ignition wires every
500
operating hours as engine
compartment heat can deteriorate the wires.
Check the resistance of each wire. Do not pull on the wire
because the wire connection inside the cap may become
separated or the insulator may be damaged. When removing
the wires from the spark plugs, grasp and twist the moulded
cap, then pull the cap off the spark plug.
The resistance value is 410 ohm per inch of wire.
CHECKING
RESISTANCE
DRIVE BELT ADJUSTMENT
The drive belts must be properly tensioned. 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 22.5Kw and 20Kw SBEG generators have two drive
belts, one drives the governor and alternator and the other
drives the raw water pump. The tension adjustment
procedure for both belts is as follows:
A
WARNING:
Never attempt
to
check
or
adjust the
drive belt's tension while the engine is in operation.
1. Remove the belt gUard.
2.
To adjust the governor drive belt, loosen the two governor
mounting bolts.
To adjust the raw water pump/fresh water pump drive
belt, loosen the two raw water pump mounting bolts.
3. With the belt(s) loose, inspect for wear, cracks, and frayed
edges, and replace if necessary.
4. To loosen or tighten the governor drive belt, slide the
governor in or out as required, then retighten its mounting
bolts.
To loosen or tighten the raw water pump/fresh water
pump drive belt, slide the raw water pump in or out
as
required, then retighten its mounting bolts.
5. The drive belts are properly adjusted if it can be deflected
no less than
3/8
inch
(lOmm)
and no more than
1/2
inch
(l2mm)
as the belt is depressed with the thumb at the
midpoint between the
two
pulleys on the longest span of
the belt.
NOTE: Maintain a 221b pressure to the belt's outer face for
proper belt operation. Spare belts should always be
carried on board.
6. Operate the generator for about 5 minutes then shut down
and recheck the belt(s) tension.
7. Replace the belt guard.
Engines
&
Generators
22