1997 Ski-Doo Factory Shop Manual Volume Two, Page 85Get this manual
Sub-Section 04
Section 03 ENGINE (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
LEAK TEST AND ENGINE DIMENSION MEASUREMENT 4
LEAK TEST
The following gives verification procedures for liquid cooled engines though it also applies to fan cooled enginesFor FC engines, do not consider information pertaining to coolant system and crankcase rotary valve gear reservoircomponentsOn twin-cylinder engines, each cylinder can not be verified individually due to leakage from one cylinder to the other through rotary valve (except on engines with separate intake manifolds)Besides, on FC engines, leak will occur through labyrinth sleeve in center of crankshaft10Engine must stand this pressure during minutesIf pressure drops before minutes, check tester kit by spraying soapy solution on pump piston, all plugs and fittingsIf tester kit is leaking, bubbles will indicate where leak comes fromIf tester kit is not leaking, check engine as per following procedure
PROCEDURE