Section 07 PROPULSION
Subsection 01 (JET PUMP)
1
F18J1CA
1. Check for cavitation, deep scratches or other damage
Wear Ring
Check wear ring
no. 4
for deep scratches, irregular
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. 28
. 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. 30
and seal
no. 29
.
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.
The radial play should be 0 (zero).
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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.
O.P.A.S. Filter
O.P.A.S. filter is part of plastic elbow. Check for
cleanliness. Replace or clean it as necessary.
Sacrificial Anode (if so equipped)
Check for wear. If worn more than half, replace
anode.
ASSEMBLY
Hands, tools, bench, rags must be clean before
pump disassembly.
CAUTION:
Pump grease tube must be opened
at very last moment to avoid contamination.
Plastic Elbow
Install plastic elbow at 20° angle to the right.
It may exceed inside housing by 2.5 mm (.098 in).
It may be positioned up to 2.0 mm (.078 in) from
housing edge.
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