Chrysler 300M Service Manual page 221

7 - 34 ENGINE
WATER PUMP - 2.7L (Continued)
Fig. 26 WATER PUMP - 2.7L ENGINE
1 - WATER PUMP BODY
2 - IMPELLER
3 - GASKET
NOTE: It is normal for the water pump to weep a
small amount of coolant from the primary weep
hole (black stain at weep passage). 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 from the primary weep
passage (Fig. 28) and (Fig. 29). This indicates a
shaft seal failure and pump must be replaced. Cool-
ant may leak from the secondary weep passage and
fill the valley of the engine (Fig. 28) and (Fig. 30). If
this condition is found, clean the primary weep pas-
sage of debris. Be sure to perform a thorough anal-
ysis before replacing water pump.
WARNING: DO NOT REMOVE PRESSURE CAP
WITH THE SYSTEM HOT AND PRESSURIZED. SERI-
OUS BURNS FROM COOLANT CAN RESULT.
(1) Drain cooling system. (Refer to 7 - COOLING -
STANDARD PROCEDURE)
(2) Remove radiator upper crossmember. (Refer to
23 - BODY/EXTERIOR/GRILLE OPENING REIN-
FORCEMENT - REMOVAL)
(3) Remove radiator fan. (Refer to 7 - COOLING/
ENGINE/RADIATOR FAN - REMOVAL)
(4) Remove accessory drive belts. (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL)
NOTE: The water pump is driven by the primary
timing chain.
(5) Remove the timing chain and all chain guides-
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT/CHAIN AND SPROCKETS - REMOVAL).
(6) Remove bolts attaching water pump to block
(Fig. 27).
(7) Remove water pump and gasket.
Fig. 27 WATER PUMP - 2.7L
1 - WATER PUMP
2 - BOLTS
3 - BOLTS
INSPECTION - 2.7L
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 shaft seal is leaking, this
will be evident by traces of thick deposits of dried
glycol running down from the pump primary weep
passage (Fig. 28) and (Fig. 29). A thin black stain
below the pump primary weep hole/passage is consid-
ered normal operation.
(3) Coolant leaks: If the pump primary weep pas-
sage is plugged, coolant may come from the second-
ary weep passage and collect in the valley of the
engine. The coolant will eventually run out the back
side of the engine (Fig. 28) and (Fig. 30). Leakage
from the secondary weep passage may give false indi-
cations that core plug(s) may be leaking on the back
side of the engine block. If this condition is found,
clean the primary weep passage of debris.
(4) Impeller rubs inside of cylinder block.
(5) Excessively loose or rough turning bearing.
LH