Section 03 ENGINE
Sub-Section 03 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
03-03-3
4. Block both hoses of rotary valve gear lubrica-
tion system with hose pinchers.
1. Block both hoses
If leakage stops, ignore remaining items and
check crankcase rotary valve gear reservoir as per
Crankcase Rotary Valve Gear Reservoir
of this
section.
5. Remove clutch then check crankshaft outer
seal.
6. Remove rewind starter and magneto system
then check crankshaft outer seal.
7. Check crankcase rotary valve gear reservoir.
Crankcase Rotary Valve Gear Reservoir
Block one hose of rotary valve gear lubrication
system with a hose pincher and install an adapter
in remaining hose.
Install air pump on adapter and pressurize as be-
fore.
1. Blocked hose
1. Remove a spark plug or any plug of leak tester
kit on PTO side.
If pressure drops, it indicates defective crank-
shaft inner seal on PTO side.
2. Remove a spark plug or any plug of leak tester
kit on MAG side.
If pressure drops, it indicates defective crank-
shaft inner seal on MAG side.
3. Check drain hole below coolant pump housing
with soapy water.
1. Drain hole
If there is a leak, it indicates defective seal of ro-
tary valve shaft (oil seal beside coolant seal).
1. Oil seal
A01B2YA
1
A01B2ZA
1
A01B30A
1
A01D1BA
1
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