Polaris Trail Blazer, Service Manual

Page: 179 / 665

3.34 Polaris Sales Inc. 4/99
ENGINE
EC38PL Engine
Water Pump Impeller Clearance, cont.
3. Reinstall case gasket and bolt case together in
areas (B) and (C) as indicated on the photo at
right.
4. Carefully remove case cover.
5. Remove water pump impeller and check
clearance measurement. Acceptable
clearance measured with a dial caliper is
between .020
″
- .040
″
(.05 -.1 cm).
CAUTION:
If the clearance is less than .020
″
(.05 cm) the
impeller may grind against the case. If the
clearance is more than .040
″
(.1 cm) the water
pump may cavitate and cause overheating.
6. The photo at right illustrates checking
clearance measurement with a dial caliper. A
feeler gauge can also be used to check
thickness by removing half of the putty or clay
from the impeller blade.
Impeller Spacer shim part numbers:
PN 3084188 0.1 mm/.004
″
PN 3084189 0.2 mm/.008
″
B
B
B
B
C
C
Counterbalance
Water Seal
Lip/Spring Toward
Counterbalance
Bearing
Closed Side
Toward Each
Other
Oil Seal
Lip/Spring
Toward Impeller
Impeller
3084184
3084185
Oil Hole
Bearing
Weep Hole
Press Oil Seal
Past Weep Hole
Press Water Seal Flush
The illustration depicts correct
positioning of the seals. The water
seal is identified by counting the
number of sealing “lips”. It is a triple
lip seal and has a protruding edge
that faces away from the spring.
The oil seal is a double lip variety.
The lip (on the spring end) angles
back toward the spring. The spring
end of the seals (open side) must
face the oil or coolant as shown in
the illustration.
To assemble the pump casing,
press the bearing into the casing
until
flush
with the casting. Note:
Do not
press the bearing in until it
seats against the shoulder, or the
oil hole will be covered by the bear-
ing outer race. Next, press the oil
seal into the seal bore until the
weep hole is visible. Now press the
water seal in until flush with the out-
er edge of the seal bore.