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7 - 18
ENGINE
ENGINE (Continued)
CONDITION
PRESSURE CAP IS BLOWING
OFF STEAM AND/OR COOLANT
FLOWING INTO RECOVERY
CONTAINER. TEMPERATURE
GAUGE READING MAY BE ABOVE
NORMAL, BUT NOT HIGH.
COOLANT LEVEL MAY BE HIGH
IN RECOVERY CONTAINER.
COOLANT LOSS TO THE
GROUND WITHOUT PRESSURE
CAP BLOWOFF. GAUGE IS
READING HIGH OR HOT.
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION
SYSTEM). GAUGE MAY OR MAY
NOT BE READING HIGH.
POSSIBLE CAUSE
7. Cylinder head gasket leaking
allowing exhaust gas to enter
cooling system. This will cause
thermostat to open late.
8. Water pump impeller or pulley
loose on shaft.
9. Air leak on the suction side of
water pump allows air to build up in
cooling system. This will cause the
thermostat to open late.
1. Pressure relief valve in pressure
cap defective or wrong pressure
cap installed.
1. Coolant leaks in radiator, cooling
system hoses, water pump or
engine.
1. Engine overheating.
2. Freeze point of coolant not
correct.
CORRECTION
7. (a) Check for cylinder head
gasket leaks. Repair as necessary.
(Refer to 9 - ENGINE/CYLINDER
HEAD - DIAGNOSIS AND
TESTING)
(b) Check for coolant in the engine
oil. Inspect for white steam emitting
from exhaust system. Repair as
necessary.
8. Check water pump and replace
as necessary.
9. Locate leak and repair as
necessary.
1. Verify proper pressure cap part
number. Check condition of
pressure cap and seals. Replace as
necessary. (Refer to 7 - COOLING/
ENGINE/RADIATOR PRESSURE
CAP - DIAGNOSIS AND TESTING)
1. Pressure test and repair as
necessary. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING)
1. Check reason for overheating
and repair as necessary.
2. Check the freeze point of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS
AND TESTING) Adjust glycol-to-
water ratio as required.
JR
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