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ENGINE: COOLING
81
Fig. 136 - Fitting thermostat to engine.
1. Torque wrench. - 2. Torque wrench extension. - 3. Adapter
socket A. 50111.
ranging at dangerous levels.
On assembly
I
make
sure that the seating face of switch on head
is
flat
and smooth.
Thennal switch setting data: with temperature
increments of 1.8
0
F (1
0
C) per minute the terminal
contact to ground should be felt at. 230
0
to 248
0
F
(110
0
to 120
0
C).
Replace the switch which is inoperative or operates
incorrectly. provided the trouble must not be
traced to the wiring or a blown indicator bulb.
Adjusting Generator and Water Pump
Drive Belts Tension.
The generator and water pump are driven,
through pulleys,
by
a belt each which
in
turn take
drive from centrifugal oil filter pulley.
Incorrect tension of drive belts may adversely
affect engine operation.
A slack belt tends to slip causing engine overheat
due to insufficient speed of fan and water pump.
Reduced belt speed causes also low generator
charge.
On the other side a too taut belt will bring about
excessive strain on water pump and generator
shaft and, consequently
I
rapid bearing wear.
Correct tension of drive belts is obtained when,
under a load of 22 lbs (10 kg), deflection ranges
between ,394" (10 mm) and .691" (16 mm) (fig. 137).
To adjust belts tension proceed as follows:
- loosen generator mounting nuts;
- correct tension of belt setting the position of
generator support; tighten mOWlting nuts;
- remove pulley lock nuts;
- take out pulley half and shift one ore more
shims
outside (fig. 131);
- fit pulley half and secure with lock nuts.
This procedure is valid only to stretch water
pump drive belt.
OJOOO
o
Fig. 131 • Checking tension of generator and water pump
drive beits.
The Inset shows the correct poslllon of shims.
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