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HOMESERVICE MANUALSGMC1966PB25 SERIES 4.8L ENGREPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGPOWER STEERINGSTEERING LINKAGE1965-74 ALL MODELSIDLER ARM REMOVAL
1966 GMC PB25 Series 4.8L Eng

Idler Arm Removal

1966 GMC PB25 Series 4.8L EngSECTION Idler Arm Removal
  1. Place vehicle on a hoist. Remove fasteners from ball stud at relay rod. Remove ball stud from relay rod by tapping on relay rod boss with a hammer, while using another hammer as a backing. Remove idler arm-to-frame bolts and remove idler arm assembly.
    NOTE: Idler arm assembly should always be replaced if it is found that an up and down force of 25 lbs., applied at relay rod end of idler arm, produces a vertical lash of more than 1/8" in straight ahead position.
  2. To install, reverse removal procedure and note following: Install idler arm-to-frame bolts using special plain washers under bolt heads, torque nuts to specifications. Check ball studs and nuts for clean and smooth threads. Check stud seals and replace if necessary. Install idler arm ball stud in relay rod and check position of seal. Torque nuts and install cotter pins.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.