Exhaust Camshaft, Housing & Lifter - Installation

Tools Required: J 36660-A  Torque/Angle Meter

Important:  Ensure that the camshaft housing alignment dowel pins are in the cylinder head prior to installing the housing.

1. Install the camshaft carrier dowel pins in the cylinder head.
   Fig 1: Camshaft Carrier Dowel Pins

   Courtesy of GENERAL MOTORS CORP.
2. Install the camshaft housing to the cylinder head with a new gasket. Sealer is unnecessary.
3. Loosely install one camshaft housing to the cylinder head bolt in order to hold the housing in place.
   • Used lifters must be returned to their original position in the camshaft housing.
   • If the camshaft is being replaced, the lifters must also be replaced.
4. Install the lifters into the lifter bores.
NOTE: The camshaft lobes and the journals must be adequately lubricated or serious engine damage will occur upon start up.
5. Lube the camshaft lobes and the journals with the Camshaft and Lifter Prelube GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
6. Install the camshaft in the same position as when removed. The timing chain sprocket dowel pin should be straight up and line with the centerline of the lifter bores.
Fig 2: Camshaft Assembly
Courtesy of GENERAL MOTORS CORP.
7. Install the new camshaft housing to the orange camshaft housing cover seals into the cover. Sealer is unnecessary.
8. Remove the bolt holding the housing in place.
9. Install the camshaft housing cover to the camshaft housing.
Fig 3: Camshaft Housing Cover
Courtesy of GENERAL MOTORS CORP.
10. Use the J 36660-A  and install and tighten the bolts in sequence. Rotate the bolts the amount of degrees specified in sequence.
    • Tighten the camshaft housing to cylinder head bolts to 15 N.m (11 ft lbs) + 90 degrees.
    • Tighten the camshaft housing cover to camshaft housing bolts to 15 N.m (11 ft lbs) + 30 degrees.
Fig 4: Camshaft Housing Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.