Chrysler 300M 2002 Service Manual page 214

LH
WATER PUMP - 3.5L (Continued)
NOTE: It is normal for the water pump to weep a
small amount of coolant from the weep hole (black
stain on water pump body). Do not replace the
water pump if this condition exists. Replace the
water pump if a heavy deposit or a steady flow of
engine coolant is evident on water pump body from
the weep hole (shaft seal failure). Be sure to per-
form a thorough analysis before replacing water
pump.
(1) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(2) Remove accessory drive belts (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
NOTE: The water pump is driven by the timing belt.
(3) Remove engine timing belt (Refer to 9 -
ENGINE/VALVE TIMING/TIMING
SPROCKETS - REMOVAL).
(4) Remove water pump mounting bolts (Fig. 30).
Note position of longer bolt for proper re-installation.
(5) Remove water pump body from engine (Fig. 30).
Fig. 30 WATER PUMP - 3.5L ENGINE
1 - SCREWS
2 - WATER PUMP BODY
INSPECTION
Inspect and replace the water pump if it has any of
the following defects:
(1) Damage or cracks on the pump body.
(2) Coolant leaks; if the seal is leaking, this will be
evident by traces of thick deposits of dried glycol run-
ning down the pump body and components below. A
thin black stain below pump weep hole/passage is
considered normal operation.
(3) Impeller rubs inside of the rear timing belt
cover.
(4) Excessively loose or rough turning bearing.
NOTE: It is normal for the water pump to weep a
small amount of coolant from the weep hole (black
stain on water pump body). Do not replace the
water pump if this condition exists. Replace the
water pump if a heavy deposit or a steady flow of
engine coolant is evident on water pump body. This
indicates a shaft seal failure and pump must be
replaced. Be sure to perform a thorough analysis
before replacing water pump.
INSTALLATION
(1) Clean all O-ring surfaces on pump and cover.
(2) Apply Mopar Dielectric Grease or the equiva-
lent silicone grease to the O-ring to facilitate assem-
bly. Install new O-ring on water pump (Fig. 31).
BELT AND
1 - O-RING
2 - IMPELLER
3 - WATER PUMP BODY
(3) Position water pump to engine.
(4) Install mounting bolts and tighten to 12 N·m
(105 in. lbs.).
(5) Install timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
INSTALLATION).
(6) Install accessory drive belts (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION).
(7) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
Fig. 31 WATER PUMP - 3.5L
ENGINE 7 - 35