1996 Ski-Doo Shop Manual, Volume 1, Page 104Get this manual
Se ion EN GI Sub-Section 03 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
2Remove spark plug or any plug of leak tester kit on MAG sideIf pressure drops, it indicates defective crankshaft inner seal on MAG side3Check drain hole below coolant pump housing with soapy waterBlock both hoses
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If leakage stops, ignore remaining items and check crankcase rotary valve gear reservoir as per Crankcase Rotary Valve Gear Reservoir of this section5Remove clutch then check crankshaft outer seal6Remove rewind starter and magneto system then check crankshaft outer seal7Check crankcase rotary valve gear reservoir