Spark Plugs; Drive Belts; Ignition Wires - Westerbeke 6.5 MCG Service Manual

ENGINE ADJUSTMENTS
SPARK PLUGS
The spark plugs should be cleaned and re-gapped after the
first 50 hour break-in period. Then refer to the Maintenance
Schedule in this manual and Specification Section for spark
plug gap.
NOTE: It
is
important to maintain spark plugs in a proper .
operating condition. They are an important component in the
ignition system in lowering carbon monoxide levels.
SPARK PLUG GAP:· 0.028 • ·0.031in. (0.7 • O.Bmm}
SPARK PLUG TORQUE:
11 • 15./b·ft. (1.5 • 2.31 kg-m)
INSPECT FOR
WEAR & CARBON
INSPECTING
THE SPARK
PLUGs
INSPECT FOR
DAMAGE
,.._____CHECK FOR.
DETERIORATION
AND DAMAGE
NOTE: Loctite Anti-Seize applied to the threaded portion oj
the spark plugs will" retard corrosion, making future removal
of the spark plugs easier.
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.
DRIVE BELT ADJUSTMENT
The drive belt 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.
1. Remove the belt guard.
2. To adjust the raw water pump/fresh water pump drive
belt, loosen the two raw water pump mounting bolts. With
the belt: loose, inspect for wear, cracks, and frayed
edges, and replace
if
necessary.
3. 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.
4. The drive belt are properly adjusted if it can be deflected
no less than 3/8 .inch (lOmm) and no more than.li2 inch
(12mm)
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 22lb pressure to the belt's outer face for
proper belt operation. Spare 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.
5. Operate the generator for about 5 minutes, then shut down
the generator and re-check the belt tension. Replace the
belt guard.
43
RAW WATER PUMP
PULLEY