Bombardier SeaDoo 1992 factory shop manual, Page 174Get this manual
Section 08 PROPULSION ANID DRIVE SYSTEMS Sub-section 01 (PROPULSION AND DRIVE SYSTEMS)
Impeller and boot condition can be quickly checked from underside of the watercraftRemove drill and look through water inlet opening
Measuring from ventun side
ImpellerJWear Ring Clearance
This clearance IS critical for jet pump performance
Using long feeler gauge 30 cm (12 in) blades, measure clearance between impeller blade tip and wear ringMeasure each blade at its centerClearance shoud not exceed .5 mrn 1.020 in)If clearance is greater, disassemble jet pump anld inspect impeller andwear ringRenew worn parts