Section13PROPULSION
Subsection 01 (JET PUMP)
1
F18J1BA
1. Replaced if blunted round or damaged
Check impeller for cavitation damage, deep
scratches or any other damage.
1
F18J1CA
1. Check for cavitation, deep scratches or other damage
Wear Ring
Check wear ring no. 10 for deep scratches, irreg-
ular surface or any apparent damage.
If impeller/wear ring clearance is too large and im-
peller is in good shape, renew wear ring.
Ball Bearing and Impeller Shaft
WEAR
IMPORTANT: Make sure to reassemble ball cage,
bearing inner and outer races to their original po-
sition.
Inspect ball bearing no. 16. Check for corrosion,
scoring, pitting, chipping or other evidence of
wear.
With your finger nail, feel contact surface of
sleeve. If any irregular surface is found, renew
sleeve no. 14 and seal.
Install bearing, 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, with impeller.
Retain housing in a soft jaw vise making sure not
to damage housing lug.
Set a dial gauge and position its tip onto metal 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 0.75 mm
(.029 in).
1
F18J1DA
2
TYPICAL — MEASURING IMPELLER SHAFT RADIAL PLAY
1. Dial gauge
2. Measure close to threads at shaft end
Excessive play can come either from worn bearing
or damaged jet pump housing bearing surface.
smr2004-Complete Line Up 645
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