TRUCK SERVICE MANUAL
ENGINE
3. Install small oil seal (9), if used (idler pulley type
body), into body, using ST-1191-2 Seal Mandrel, with lip
WATER PUMP/I D LER (FFC SERIES-ECCENTRIC)
of seal opposite impeller end.
4. Using ST-659 Mandrel, install new carbon face seal
DISASSEMBLY AND INSPECTION
(11), into body (10) until seal bottoms in bore. Keep seal
1. Remove pulley (1, Fig. 8-1) and impeller (12) using
face free of grease or other foreign material.
ST-647 puller or equivalent.
5. Press shaft and bearing assembly into water pump
2. Remove ceramic seat and rubber seal (13), large oil
body (10) using ST-658 Mandrel. Do not support body
seal (4) and snap ring (5), discard seals.
on thin sections of impeller cavity. Install retaining ring
3. Support pulley end of pump body (10) and press
(5).
bearing and shaft assembly from body.
6. Install large oil seal (4), if used (idler pulley type body),
4. Using both halves of ST-1114 Bearing Puller installed
into body using ST-1 191-3 Seal Mandrel.
around bearing spacer in the grease channel, press shaft
7. Install new ceramic seat (with dimples on face away
through outer bearing (6) and bearing spacer (8).
from carbon face seal) on shaft; install rubber seal on
5. Remove snap ring (2) securing inner bearing (7),
shaft against ceramic seat (with flat side toward impeller
supporting bearing race, press shaft from bearing.
end of shaft). Lubricate bore with a solution of clean
6. Remove carbon face seal (11) and small oil seal (9)
soap water or liquid soap to ease installation onto shaft.
from water pump body (10); discard seals.
8. Support water pump on pulley end of shaft and press
7. 1 nspect bearings and spacer for roughness and
impeller on shaft, maintaining 0.020 to 0.040 inch [0.51 fo
wear.
1.02 mm] clearance between impeller and cavity.
8. Inspect water pump impeller; replace if cracked or
9. Support water pump assembly on impeller end of
corroded to extent that it will retard coolant circulation.
shaft (not on impeller) and press pulley on shaft until
9. Measure impeller/pulley bore and shaft diameter.
pulley hub is flush with shoulder on shaft. Install locknut
There should be a minimum of 0.001 inch [0,03 mm]
and washer (if used), tighten to 90 to 100 ft-lbs [12.5 to
press-fit between shaft and bore. Inspect shaft for
straightness and galling on press fit diameter surfaces.
10. Install new grease and relief fittings if required. Fill
10. Inspect pulley grooves for wear, water pump body for
1/2 to 2/3 full with grease. See Group 18 for type grease.
cracks, possible damage from bearing spinning, and that
11. Check assembly for freedom of rotation.
"weep" hole is open.
Repair or replace parts as
necessary.
Idler Pulley Assembly
11. Inspect wear sleeve (3) on pulley (if used). If
DISASSEMBLY AND INSPECTION
grooves are visible, remove sleeve as follows:
1. Remove spacer from shaft. Remove "O" ring, oil seal
a. Grind a 15 deg. angle on end of a 3/16 inch straight
and snap ring.
shank round punch.
2. Remove shaft and bearing assembly from pulley. It
b. Secure pulley in vise. Do not tighten too tight,
may be necessary to remove pipe plug and use a small
excessive pressure could crack pulley.
punch to knock shaft and bearing assembly from pulley.
c. Using punch, drive sleeve from pulley hub by placing
3. Inspect idler bearing for roughness and wear, if
punch through puller holes in pulley; discard sleeve.
required, press shaft from bearing, inspect shaft for
d. Install new sleeve with a suitable mandrel.
straightness or galling on bearing surface and mutilated
threads.
ASSEMBLY
4. Inspect spacer for excessive wear or grooves in oil
1. Lubricate shaft (14, Fig. 8-1) and using ST-658
seal area. If grooves are visible replace spacer.
Mandrel seated on inner race, press inner bearing (7)
5. Inspect pulley grooves for wear. Replace parts as
over shaft (14) until it bottoms on shaft shoulder. Install
necessary.
snap ring (2) and bearing spacer (8).
2. Using ST-658 Mandrel seated on inner race of outer
ASSEMBLY
bearing (6), press bearing on shaft (14) until it seats
against bearing spacer (8). Check both bearings for free
1. Lubricate shaft and using a suitable mandrel seated
rotation.
on
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