——2----- C O O L I N G—b Y S T E M - Tr ou bl e Shooting. Water Pumn
T R O U B L E S H O O T I N G
Symptoms & P rob a b le Causes
1 . Overheating
a . L a c k of coolant
b . L o o s e fan belt
c. Oil soaked fan belt
d . Defective thermost
e . Water pump inoperative
f . Clogged cooling system
g . In c o rre c t ignition timing
h. B r a k e dragging
2. O vercoolin g
a . Therm ostat defective
b . E x tre m e ly s e v e r e climate
3. L o s s of coolant
Remedies
Replenish, and check fo r leaks
Adjust fan belt tension
R ep lace fan belt '
R eplace thermostat
R ep air o r replace w a ter pump
Clean radiator, and w ater jacket
Adjust ignition timing
Adjust brakes
R eplace thermostat
C o v e r part of radiator c o re
a . L e a k y radiator
b . L o o s e o r damaged hose
connection
c . L e a k y w a te r pump
d. L o o s e heater hose connection
o r damaged hose
e . L e a k y cylinder head gasket
f . C racked cylinder head o r block
4. N o is y cooling system
a. Defective w a te r pump bearing
b . L o o s e o r bent fan blades
c . Defective fan belt
W A T E R P U M P
Description
T h e w a te r pump equipped on 5R en
gine is of a direct driven fan type fo r
stable cooling effect under e x c e s s iv e
heavy load operation, but on 5R en
gine equipped with the T o yo glid e A u
tomatic
transmission
and R T 4 3 L ,
5 2 L which is equipped with 3 R - B
and 3 R - C is of a fluid coupling type
which minimizes the p o w e r loss at
high speed operation.
T h e fluid coupling consists of the coup
ling case , coupling ro to r , fluid coup
ling b e a rin g , bearing c a s e , silicone
oil and the pulley seat.
R e p a ir o r replace radiator
Tighten connections o r replace hose
R ep air o r replace w a te r pump
Tighten connection or replace hose
Tighten bolts evenly and securely
R e p a ir o r replace as n ec es s ary
R eplace w a te r pump bearing
Tighten, re p a ir o r replace fan blades
R eplace fan belt
F i g . 7-2 D ire c t D riv e n T y p e G1708
Water
Pump Section
Summary of Contents for 3R-B 1969
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