Rotary Valve: Reassembly

1971 Chevrolet Chevelle Concours, Not Available, 5.0L Eng, Eng CD CCCSECTION Reassembly

Lubricate three valve ring back-up "O" ring seals with transmission oil and assemble in three grooves in valve body. Do not allow seals to become twisted. Assemble valve rings in ring grooves over the "O" ring seals by carefully slipping rings over valve body.

NOTE: Rings may appear to be twisted in grooves, but heat of oil after assembly will cause them to straighten.

Install new valve spool dampener "O" ring seal in valve spool groove, then lubricate seals with transmission oil. Do not allow seals to twist in groove. Assemble stub shaft in valve body, aligning groove in valve cap with pin in valve body. Tap lightly on cap with a plastic hammer until cap is seated against shoulder in valve body with valve body pin in cap groove. Hold these parts together during rest of assembly. Lubricate valve spool with transmission oil and slide spool over stub shaft with notch toward valve body. Align notch with spool drive pin in stub shaft and carefully engage spool in valve body bore.

Fig 1: Stub Shaft Installation
G09347816Courtesy of GENERAL MOTORS COMPANY
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:

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