Section 13 PROPULSION SYSTEM
Subsection 02 (JET PUMP)
13-02-32 SMR2003-040_13_02A.FM
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. 33. 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.
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 between
highest and lowest dial gauge reading is radial play.
Maximum permissible radial play is 0.75 mm (.029 in).
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.
Seal
Carefully inspect seal lips. Make sure that lips are
not worn, distorted, cracked or show signs of any
other damage. Replace after 100 hours.
Bearing
Replace bearing whenever the marks of corrosion
and presence of water is found.
OPAS Filter
OPAS filter is part of plastic elbow no. 45. Check
for cleanness. Replace or clean it as necessary.
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 no. 45 at 20° angle to the
right.
It may exceed inside housing by 1.0 mm (.039 in).
It may be positioned up to 2.0 mm (.078 in) from
housing edge.
A. 20°
B. 2.0 mm (.078 in)
C. 1.0 mm (.039 in)
A
F18J0EA
B
C
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