Bombardier SeaDoo 2001 factory shop manual, Page 73Get this manual
Section 04 ENGINE Subsection 02 (LEAK TEST)
Check also small oil injection pump lines and fittings; check for air bubbles or oil column going toward pump, which indicate defective check valveCheck for leak through cournterbalancing shaft seal toward air compressor (DI engines)Air bubbles in lowest fitting (oil return line) underneath compressor indicates seal leakageIf the above mentioned components are not leaking, block both oil hoses of the rotary valve shaft (if so equipped) using hose pinchersNOTE: If leakage stops at this point, proceed with Rotary Valve Shaft testing (if so equipped)If there is still some leakage, remove the PTO flywheel to verify outer sealIf no leak is found on the PTO side outer seal, remove magneto flywheel and verify crankshaft outer sealsProceed with the Rotary Valve Shaft testing (if so equipped) if the crankshaft outer seals are not leaking