Jeep UNIVERSAL CJ-2A Service Manual page 120

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
H
d.
Surging or "after boil." Check pressure cap and
replace if valves or gasket are faulty. Install lower
temperature thermostat, if necessary.
h. Be sure a thermostat is installed. See
Th~rmo­
stat Par. H-7.
i. Check the temperature gauge.
e. External leaks. Check the following for leaks:
H-158. Heater
Hoses and clamps, water pump, radiator, head
gasket, core plugs and drain cocks, as well as the
cylinder head or block for cracks.
f. Internal leaks. Check for faulty head gasket,
cracked cylinder head or block.
g. Poor coolant flow. Check hose condition, water
pump, fan belt, and repair or replace as necessary.
Inspect block for rust or scale, and clean and flush
the system, if necessary.
Early production vehicles are equipped with
manual-operated fresh air heaters. The heater
controls are operated manually through Bowden
cables.
Late production vehicles are equipped with
vacuum-operated fresh air heaters that are operated
by and identified by push buttons.
Symptoms
Overheating:
H-15C. SERVICE DIBGNOSTS
Probable Remedy
Lack of coolant ......................................... Refill radiator
Thermostat inoperative .................................... Replace
Water pump inoperative .............. ., ................... Overhaul or replace
Incorrect ignition or valve timing .......................... Set timing
Excessive piston blowby .................................. Check pistons, rings and cylinder walls
Fan belt broken. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ·Reo lace
Radiator clogged ........................................ Reverse flush
Air passages in core clogged. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clean with water and air pressure
Excessive carbon formation ............................... Remove
Muffler clogged or bent exhaust pipe ....................... Replace
Loss of Cooling Liquid:
Loose hose connections ................................... Tignten
Damaged hose ........................................... Replace
Leaking water pump ..................................... Replace
Leak in radiator ......................................... Remove and repair
Leaky cylinder head gasket ............................... Replace
Crack in cylinder block ................•.................. }Small crack can be closed with
Crack in cylinder head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator Sealer
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