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Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 4 - Engine Overhaul
Page 45
a. Torque screw to 70 in. lbs. (8.0 Nm).
Fig. 95
Check Breather
The engine utilizes a breather valve to control and
maintain a vacuum in the crankcase. The breather vents
crankcase vapors through the air cleaner.
The reed valve is spring-loaded and must make a
complete seal around the vent holes in breather
body, Fig. 96. Check to see that reed valve is not
deformed. DO NOT USE FORCE ON REED VALVE.
Fig. 96
REPLACING WATER PUMP SEAL
The water pump seal may be replaced without removing
the crankcase cover from the engine. The water pump
housing and water pump impeller must be removed. If
any evidence of coolant is observed in the oil, this
indicates that the oil seal behind the water pump seal is
leaking. To replace the oil seal, the crankcase cover
must be removed.
To remove the oil seal, use the same tools and
procedure for removing the water pump seal.
The following tools are required to remove the water
pump seal, Fig. 97:
• Puller Nut
#19140
• Puller Stud
#19398
• Support Driver
#19394
• Pilot Nut
#19395
• 1/2” Flat Washer
• Nut
#94814
Fig. 97
Removing Water Pump Seal
1. Assemble puller nut to puller stud with
chamfered side down as shown in Fig. 97.
2. Insert nut and stud through water pump seal at a
slight angle as far as it will go, Fig. 98.
50


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