Dodge dakota 2002 Service Manual page 309

7 - 22 ACCESSORY DRIVE
BELT TENSIONERS - 3.7L / 4.7L
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 22
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 23
BELT TENSIONERS - 5.9L
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 23
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 24
BELT TENSIONERS - 5.9L DIESEL
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 24
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 25
BELT TENSIONERS - 3.7L /
4.7L
DESCRIPTION
Correct drive belt tension is required to ensure
optimum performance of the belt driven engine acces-
sories. If specified tension is not maintained, belt
slippage may cause; engine overheating, lack of
power steering assist, loss of air conditioning capac-
ity, reduced generator output rate, and greatly
reduced belt life.
It is not necessary to adjust belt tension on the
3.7L or 4.7L engine. These engines are equipped with
an automatic belt tensioner (Fig. 1). The tensioner
maintains correct belt tension at all times. Due to
use of this belt tensioner, do not attempt to use a belt
tension gauge on 3.7L or 4.7L engines.
OPERATION
The automatic belt tensioner maintains belt ten-
sion by using internal spring pressure, a pivoting
arm and pulley to press against the drive belt.
REMOVAL
On 3.7L and 4.7L engines, the tensioner is
equipped with an indexing tang on back of ten-
sioner and an indexing stop on tensioner hous-
ing. If a new belt is being installed, tang must
be within approximately 24 mm (.94 inches) of
ACCESSORY DRIVE
TABLE OF CONTENTS
page
DRIVE BELTS - 3.7L / 4.7L
DRIVE BELTS - 5.9L
DRIVE BELTS - 5.9L DIESEL
1 - AUTOMATIC TENSIONER ASSEMBLY
indexing stop. Belt is considered new if it has
been used 15 minutes or less.
width)
pressor, power steering pump, water pump, idler pul-
ley or generator)
DIAGNOSIS AND TESTING - ACCESSORY
DRIVE BELT . . . . . . . . . . . . . . . . . . . . . . . . . 25
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 27
DIAGNOSIS AND TESTING - ACCESSORY
DRIVE BELT . . . . . . . . . . . . . . . . . . . . . . . . . 28
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 31
DIAGNOSIS AND TESTING—ACCESSORY
DRIVE BELT . . . . . . . . . . . . . . . . . . . . . . . . . 31
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 34
Fig. 1 AUTOMATIC BELT TENSIONER
If the above specification cannot be met, check for:
• The wrong belt being installed (incorrect length/
• Worn bearings on an engine accessory (A/C com-
• A pulley on an engine accessory being loose
• Misalignment of an engine accessory
• Belt incorrectly routed.
DR
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