1999 Ski-Doo Factory Shop Manual Volume Three, Page 117Get this manual
Subsection 03
Section 04 ENGINE (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
ENGINE LEAK VERIFICATION FLOW CHART
ENGINE LEAK VERIFICATION FLOW CHART
PRESSURIZE ENGINE NO
IS ENGINE LEAKING? YES CHECK ALL JOINTED SURFACES, SCREWSTUD THREADSMOUNTING FLANGES ETCYES REPLACE GASKET OR O-RING, RE-SEAL LEAKING AREA
ANY LEAK FOUND? NO CHECK SMALL OIL LINES OF INJECTION PUMP
AIR BUBBLES FOUND OR OIL MOVING TOWARD PUMP? NO REMOVE BLEED SCREW ON CYLINDER HEAD
REPLACE BANJO FITTING(S)LINE(S)
ARE ANY AIR BUBBLES IN COOLANT? NO BLOCK LARGE HOSES OF ROTARY VALVE GEAR LUBRICATION SYSTEM NO
REPLACE O-RING OF CYLINDER HEAD ANDOR CYLINDER BASE GASKET
IS ENGINE STILL LEAKING? YES CHECK CRANKSHAFT OUTER SEAL OF PTO AND MAG SIDES YES
ARE SEALS LEAKING? NO PRESSURIZE ROTARY VALVE GEAR RESERVOIR IN CRANKCASE PRESSURIZE ROTARY VALVE GEAR RESERVOIR IN CRANKCASE YES