Bombardier SeaDoo 1990 factory shop manual, Page 142Get this manual
Section 08 PROPULSIONDRIVE SYSTEMS Sub-Section 01 (PROPULSIONDRIVE SYSTEMS)
26,28, ImpellerWear Ring
Examine impeller in wear ring for distortion Check if tips of blades are blunted round, chipped or broken Such impeller is unbalanced and will vibrate and damage wear ring, impeller shaft, shaft seal or bearings Renew if damaged
4,10, Needle BearingImpeller Shaft
Inspect needle bearings and their contact surface Check for scoring, pitting, chipping or other evidence of wear With finger tip, feel contact surface of seal If any irregular surface is found, renew impeller shaft With impeller shaft installed with bearings, rotate it and make sure it turns smoothly
Replace if blunted round or damaged
Radial Play
Radial play is critical for jet pump unit life span Radial play of impeller shaft is checked with shaft in houstng, without impeller Retain housing in brass jaw vise making sure not to damage housing lug