Diagnosis of drive belt tensioner A20NFT/LHU
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Diagnosis of drive belt tensioner A20NFT/LHU
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Stage
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Event
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Yes
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No
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1
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2.
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Check the drive belt's tension pulley.
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Is the drive belt's tension pulley loose or misaligned?
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Go to
Step 4
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Go to
Step 2
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2
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Rotate the drive belt's tensioner.
Does the tensioner rotate without any unusual resistance or binding?
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Go to
Step 3
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Go to
Step 4
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3
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1.
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Use a torque wrench to measure the torque required to move the tensioner from the stop.
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2.
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Use a torque wrench on a tensioner that is known to be OK in order to measure the torque required to move the tensioner from the stop.
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Is the first torque value within 10 percent of the second torque value?
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System OK
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Go to
Step 4
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4
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Replace the drive belt tensioner. See
Belt tensioner with idler pulley
Has the repair been completed?
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System OK
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-
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