Bombardier SeaDoo 1989 factory shop manual, Page 122Get this manual
Section 08 PROPULSIIONDRIVE SYSTEMIS Sub-section 01 (PROPULSIONDIRIVE SYSTEMS)
Radial Play Radial play is critical for jet pump unit life spanRadial play of impelller shaft is checked with shaft in housinlg, without impellerRetain housing in brass jaw vise making sure not to damage housing lugSet dial gauge and position its tip onto end of shaft, close to end of threadsMove shaft end up and downDifference between highest and1lowest dial gauge reading is radial playMaxirnumpermissible radial play is 0.05 i.002in)Measuring impeller shaft radial play
Using micrometer, measure diameters on bearing contact surfacesMinimum shaft diameter sholuld be 22.23 mrn (.8753 in)If shaft is within tolerance, that indicates worn bearingsReplace both bearingsMeasuring shaft diameter at bearing contact surface
NOTEIf shaft is to be replaced, it is recommended to replace both bearings at same time In addition, it is suggested to replace thrust bearing and thrust washer