Illustration 33 g06276750
Table 20
Troubleshooting Test Steps Values Results
5. Remove the Belt and Tensioner for Inspection
A. Remove the belt. Refer to Disassembly and Assembly, Al-
ternator Belt - Remove and Install .
B. Use a suitable tool to move the tensioner arm over the full
range of movement between stops (3) and (5).
C. Turn pulley (6). Check that the pulley turns smoothly and
quietly.
Note: New bearings may not turn as freely as used bearings.
D. Ensure that the pulley surface (A) is parallel to the tensioner
mounting surface (B). Refer to Illustration 33 (typical example).
E. Remove the belt tensioner. Refer to Disassembly and As-
sembly, Belt Tensioner - Remove and Install.
F. Check for evidence of metal-to-metal contact between arm
(2) and spring case (4).
G. Inspect arm (2) and spring case (4) for cracks and damage.
H. Inspect arm case stops (3), spring case stops (5), and loca-
tor pin (7) for damage.
I. Inspect the tensioner for excessive bearing wear.
Result: The tensioner does not move smoothly over the
full range.
Repair: Replace the belt tensioner. Refer to Disassembly
and Assembly, Belt Tensioner - Remove and Install.
Result: Pulley (6) does not spin smoothly or the pulley
makes a noise when spinning.
Repair: Replace the belt tensioner. Refer to Disassembly
and Assembly, Belt Tensioner - Remove and Install.
Result: The pulley surface is not parallel to the mounting
surface.
Repair: Replace the belt tensioner. Refer to Disassembly
and Assembly, Belt Tensioner - Remove and Install.
Result: There is evidence of metal-to-metal contact be-
tween (2) and spring case (4).
Repair: Replace the belt tensioner. Refer to Disassembly
and Assembly, Belt Tensioner - Remove and Install.
Result: There is evidence of damage to any part of the belt
tensioner.
Repair: Replace the belt tensioner. Refer to Disassembly
and Assembly, Belt Tensioner - Remove and Install.
80 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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