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ENGINE (CYLINDERS / HEAD / BASE / EXHAUST) 7 - 24
– If there is no leak at the tested location, continue pumping to
maintain pressure and continue with the next item until the leak is
found.
Engine
Check the following:
1. All jointed surfaces and screw/stud threads of engine:
– spark plug base, insulator
– cylinder head
– RAVE valve bellows, piston and housing
– cylinder
– crankcase halves (joint)
– oil injection pump mounting flange (O-ring)
– coolant pump housing
– bleed screws/plugs.
– crankcase grease reservoir fitting
Check for air bubble or oil column going toward pump. It indicates
defective check valve in injection nipples.
2. Remove cooling system cap.
Check for air bubbles in antifreeze. It indicates defective cylinder
head O-ring or cylinder base gasket.
3. Remove drive pulley then check crankshaft outer seal.
4. Remove rewind starter and magneto system then check
crankshaft outer seal.
5. Check pump shaft gear oil reservoir.
Pump Shaft Oil Gear Reservoir
Install air pump on adapter and pressurize as shown at right. If
pressure drops, it indicates a defective crankshaft inner seal.
CRANKSHAFT INSTALLED IN UPPER HALF CRANKCASE
1. Crankshaft inner seal on PTO side
2. Crankshaft inner seal on MAG side
1
2
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