OIL PUMP

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine Section 4 - Engine Overhaul

3. Place a shop rag or short section of rubber fuel line under valves inside combustion chamber to hold valve in place while compressing spring. 4. Install springs and valve spring retainers over valve stems. 5. Temporarily, install rocker arm support screws in cylinder head. 6. Compress valve spring with Tool #19347 and install split retainers, Fig. 92. Repeat procedure for other valves. Remove rocker arm screws.

Fig. 92

Disassemble Oil Pump

1. Remove two screws and oil pump gear baffle , Fig. 93.

Fig. 93

2. Remove oil pick-up tube and screen assembly

. a. Discard O-ring.

Inspect Oil Pump

Inspect pump drive gear for obvious wear or chipped teeth. Inspect pump rotors, housing and crankcase cover or sump for scoring or wear. Replace as required.

Assemble Oil Pump

Lubricate outer rotor with oil and install in pump, Fig. 94.

Fig. 94

1. Assemble oil pick-up tube and screen assembly with new O-ring to pump. a. Torque screw to 70 in. lbs. (8.0 Nm). 2. Install oil pump gear baffle, Fig. 95. a. Torque screw to 70 in. lbs. (8.0 Nm). 3. Assemble oil pump to crankcase cover with new

O-rings, Fig. 95.