Accessory Drive Belts; Proper Belt Tension; Belt Tension Testing; V-Belt Diagnosis - Dodge D150 1990 Service Manual

A C C E S S O R Y DRIVE B E L T S
INDEX
Page
Diagnosis 21
GENERAL INFORMATION
Vehicles are available with either a 3.9L V - 6 e n -
gine o r a 5.2L or 5.9L V - 8 engine. T h e accessory
drive systems of all engines are operated by crank-
shaft driven V-belt accessory drive belts. The alter-
nator is driven by a dual belt system that also drives
the a i r conditioning compressor (if equipped).
PROPER BELT TENSION
Correct accessory drive belt tension is required to
ensure optimum performance of the belt driven en-
gine accessories. I f the specified tension i s not main-
tained, belt slippage may cause; engine overheating,
DIAGNOSIS
V-Belt Diagnosis
Condition Possible Cause Correction
INSUFFICIENT
(a)
Belt too loose.
w
Adjust belt tension
ACCESSORY OUTPUT
(b)
Belt excessively glazed ( f e »
Replace and tighten as
DUE TO BELT or worn. specified.
SUPPAGE
BELT SQUEAL WHEN
(a)
Belt too loose. (a)
Adjust belt tension.
ACCELERATING
W
Belt glazed. (b)
Replace belt.
BELT SQUEAK AT
(a)
Belt too loose. Adjust belt tension.
IDLE
(b)
Dirt and/or paint
H
Replace belt.
(b)
imbedded in belt.
W
Non-uraform belt. ft) Replace belt.
(d)
Misaligned pulleys. (d) Align accessory drive
(d)
pulleys.
W
Non-uniform groove or
H
Replace pulley.
eccentric pulley.
BELT ROLLED
(a)
Broken cord in belt.
ft*
Replace beh.
OVER IN GROOVE
(b»
Belt too loose or too
W
Adjust bete tension.
OR BELT JUMPS
(b»
tight.
W
Adjust bete tension.
OFF ft) Misaligned pulley.
W
Adjust belt tension.
Non-uniform groove or
ft*
Replace pulley.
eccentric pulley.
J8907-76
Page
General Information 21
lack of power steering assist, loss of air conditioning
capacity, reduced alternator output rate, and greatly
reduced belt life.
BELT TENSION TESTING-USING GAUGE
There are different gauges for checking Poly " V "
serpentine (multi-ribbed) belts and conventional " V "
belts. Use the correct gauge when checking belt ten-
sion. Place gauge in. the middle of the section of belt
being used to check tension. The gauge can only con-
tact the belt or a false reading may result. Refer to
the Belt Tension C h a r t for tension specifications. A
belt i s c o n s i d e r e d a u s e d belt after 15 m i n u t e s o f
use.