Westerbeke 7.0 BCG - Changing Coolant; Drive Belt Adjustment

COOLING SYSTEM
CHANGING COOLANT
The engine.'s coolant must be changed according to the
MAINTENANCE SCHEDULE. If the coolant is allowed to
become contaminated, it can lead to overheating problems.
A CAUTION: Proper cooling system maintenance Is
critical; a substantial numbe1 of engine failures can be
traced back to cooling syst_em c011asion.
Drain. the e11gine coolant by removing the ~ain plug on the •
engine block and opening the manifold pressure cap. Flush
the system with fresh water, then reinstall the drain and start
the refill proc~ss.
NOTE: The drain petcock on the heat exchanger should also
be used to help drain engine coolant.
A WARNJNG:, BewB1e of the hot engine coolant.
Wea1 protective glares.
Refilling the Coolant
After replacing the engine block drain plug, close the heat
exchanger-!s_cgolant petcock. Then run the engine at idle and
slowly pour clean, premixed coolant into the manifold.
Monitor the coolant in the manj.fold and add as needed. Fill
the manifold to the filler neck and install the manifold
pressure cap.
Remove the cap on the coolant recovery tank and fill with
coolant mix to halfway between LOW and MAX and replace
the cap. Run the engine and observe the coolant expansion
flow into the recovery tank.
After checking for leaks, stop the engine and allow it to cool.
Coolant should draw back into the cooling system as the
engine cools down. Add coolant to the recovery tank if
needed and check the coolant in the manifold. Cean up any
spilled coolant.
DRIVE BELT ADJUSTMENT
For your safety, Weste:rbeke 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.
Drive beltS must be properly tensioneO. Loose drive belts
will not provide proper alternator charging and will eventu-
ally damage the alternator. Drive .belts that are too tight will
pull the alternator out of alignment and/or cause the altema~
tor to wear out prematurely. Excessive drive belt tension can
also cause rapid wear of the. belt and reduce the service life
of
the fresh water pump's bearing. A slack belt or the pres-
ence '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 1/2 inch
(12mm) as the belt is depressed with the thumb at the mid-
point between the two pulleys on the longest span of the belt.
A spare belt or belts should always be carried on board.
A WARNING: llerer altBmpt to check',,, adjusttbe
ddre .belt's tension while the engine ls /11 opntloll.
Adjusting Belt Tension
FRESHWATER
PUMP POLLEY
1. Remove the belt guard.
FRONT CRANKSHAFT PULLEY
2. Loosen the alternator adjusting strap bolt and the base
mounting bolt.
3.
With the belt loose, inspect for wear, cracks, and frayed
edges.
4. Pivot the alternator on the base mounting bolt to the left
or right
as required, to loosen or tighten.
5. Tighten the base mounting bolt and the adjusting strap
bolt.
6. Operate the generator for about 5 minutes then'· shut down
and recheck the belt tension.
7. Replace the guard.
lwlWESTl!RBEKE
I Engines_ & ae~r~tqrs
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