Toyota 5R 1969 Repair Manual page 130

Th e bearing outer ra c e is secured
onto the bearing case by calking the
bearing case edge. A ls o the bearing
inner race and the rotor are secured
onto the pulley
pulley seat end. T h e r e fo r e , the rotor
and the related parts of the fluid coup­
ling cannot be disassembled.
The fluid coupling case is filled with
silicone oil, and owing to this o il, the
fan is driven almost at the same r e ­
volution with the pulley when the en­
gine is operated at comparatively low
speed, but as the rotational resistance
of the fan increases at engine high
speed operation, the slippage occurs
in the coupling. Then the fan revolu ­
tion does not increase excess ively,
and this not only avoid the unnecessary
engine pow er lo s s , but also d ec rea ses
the fan n o is e .
Th e water pump body is constructed with the thermostat ch a m ber, and the rotor
is of a centrifugal type having six blade^s. T h e advantages are as fo llo w s ; it is
compact, the delivery quantity is la rg e , and even though the outlet port is made
sm aller, the pressu re will not in crea se , th erefo re, it is quite convenient to p e r ­
form the temperature adjustment.
F ig . 7-4
Specification:
T y p e
D elivery quantity
seat by calking the
Water Pump Components fo r D irect D riven T y p e
C O O L I N G S Y S T E M - Water Pump
F ig . 7-3
Centrifugal with six blades
M ore than 70 liters (18 .5 U S gals . ,
15.4 Imp. g a ls ) per minute in the lift
C ros s Sectional
V ie w of
Fluid Coupling
1. Water pump rotor
2. Stud bolt
3 . Stud bolt
4. Thermostat guide plate
5. Water pump body
6. Water pump gasket
7. T a p e r s c r e w plug
8 . Fan pulley
9. Pulley seat
10. Water pump bearing
11 . Water pump c o v e r
12. Gasket
13. Pump seal set
7-3
G3131
Y6176