Section 13 PROPULSION
Subsection 01 (JET PUMP)
Install bearings, then install impeller shaft and ro-
tate it. Make sure it turns smoothly.
RADIAL PLAY
Radial play is critical for jet pump unit life span.
Radial play of impeller shaft is checked with shaft
in housing, without impeller.
Retain housing in a soft jaw vise making sure not
to damage housing lug.
Set a dial gauge and position its tip onto shaft end,
close to end of threads.
Move shaft end up and down. Difference be-
tween highest and lowest dial gauge reading is
radial play.
Maximum permissible radial play is 0.05 mm
(.002 in).
F01J18A
1
2
TYPICAL — MEASURING IMPELLER SHAFT RADIAL PLAY
1. Dial gauge
2. Measure close to threads at shaft end
To check both bearings, proceed the same way
with other shaft end. Position gauge tip on diam-
eter, close to flats on shaft.
F01J19A
1
2
TYPICAL — MEASURING IMPELLER SHAFT RADIAL PLAY
1. Dial gauge
2. Measure close to flats at shaft end
Excessive play can come either from worn bear-
ings or impeller shaft or damaged jet pump hous-
ing bearing surfaces.
Measuring shaft diameter will determine the de-
fective parts.
Using a micrometer, measure diameter on bear-
ing contact surfaces. Minimum shaft diameter
should be 22.24 mm (.876 in).
F01J1AA
1
2
1. Inspect for wear at the bearing pilot
2. Radial bearing raceway
NOTE: If shaft is to be replaced, it is recommend-
ed to replace both bearings at the same time. In
addition, it is suggested to replace thrust bearing
and thrust washer.
624 smr2004-Complete Line Up
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