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SERVICE BULLETIN
DATE:
April 3, 1984
BULLETIN NUMBER: 137
MODEL:
3KW, 4. 4KW, 7. 7KW, 8KW, llKW, 12. 5KW (Also related 50 Her tz
Units)
SUBJECT:
Cooling Fan Secur ing Nut
Generator units must have proper air circulation while running to pro-
vide for combustion air for use by the engine and for cooling the
generator unit (minimum 250 C.F.M. all units through l2.5KW for gener-
ator end cooling).
The fan on the back end of the above model generators plays an impor-
tant part in moving air through the generator for cooling.
In instal-
lations where surrounding air is limited, outside air should be ducted
to the area of the screened end bell inlet to provide this needed air
for cooling and combustion as well.
The secur i ty of the generator fan hold down nut should be checked at
installation (commissioning), at the initial 50-hour servicing of the
generator unit and periodically thereafter (200-300 hours). (FIGURE A)
PIN:
FLAT
WASHER
Cooling Fan
Securing Nut
FIGURE A
Securing Nut Torque - 25 lb/ft.
over ••••••
J. H. WESTERBEKE CORP.
AIION INDUSTRIAL PARK, AIION, MASS. 02322 ·(6171 588-7700
CABLE: WESTCORP, AIION·TELEX: 112-4444
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