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24. SERVICE PROCEDURE
24.11 WHEN REQUIRED
24.11.1
FAN BELT
24.11 .I .I CHECKING TENSION
The engine is equipped with an automatic belt tensioner that maintains correct
tension on the drive belt. To check belt tension a Burroughs type gauge must be
used because of the wide drive belt. Proper tension should be 1 IO to 150 N (80
to 110 Ibs).
If a Burroughs type gauge is not available, tension may be checked by belt
deflection. Press the belt with your finger at the longest span and measure the
deflection. Maximum deflection 9.5 to 12.7mm (0.37 to 0.50 in).
24.11 .I .2 ADJUSTING
With the automatic tensioner, adjustment isn't required.
24.11 .I .3 REPLACEMENT
To replace the drive belt, place a % in. drive breaker bar (1) in the square hole
in the belt tensioner. Push the breaker bar UP to loosen the tensioner. Remove
the old belt (2). Inspect belt tensioner. The tensioner pulley should spin freely
with no rough spots detected under hand pressure. Install the new belt.
24.11.2
ELECTRICAL
SYSTEM
24.11.2.1
PRECAUTIONS
A
WARNING
Before working on the engine or electrical system, disconnect
the
negative (ground) battery cable. Tag the cable and controls to warn
against starting.
When installing the battery be sure to connect the ground cable to
the negative terminal. When connecting
a booster battery or battery
charger make certain to connect the negative terminal to the negative
terminal and the positive terminal to the positive terminal.
Do not
short across or ground any terminals of the alternator or regulator.
Failure to observe these precautions will result in severe damage to
the harness and alternator.
All terminals
must be clean and fastened
securely.
Never paint electrical
connections
or the alternator. Repair or replace all broken wires immediately.
Surface under all terminals must be clean and good electrical connections
must
be established after reassembly.
Also all clips must grip cables tightly to prevent
vibrations
and rapid cable wear. All clips and straps must be closed in a
workmanlike
manner, so as not to damage the insulation.
3-56
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