Installation Procedure

Important:  Whenever a new camshaft is installed, do the following procedures:

• Change the engine oil.
• Change the engine oil filter.
• Add GM Engine Oil Supplement GM P/N 1052367 (Canadian P/N 992869) or the equivalent to the engine oil.

1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, or engine oil supplement GM P/N 1052367 (Canadian P/N 992869) or equivalent to the following components:
   • The engine camshaft lobes
   • The camshaft bearing journals
   • The camshaft bearings
2. Install three 5/16-18 x 4.0 inch bolts into the engine camshaft front bolt holes.
   NOTE: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.
   Fig 1: Installing Camshaft

   Courtesy of GENERAL MOTORS CORP.
3. Use the bolts as a handle in order to install the engine camshaft.
4. Remove the 3 bolts from the front of the engine camshaft.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
5. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the camshaft retainer bolts.
6. Install the camshaft retainer and bolts.

   Tighten 

   Tighten the camshaft retainer bolts to 12 N.m (106 lb in).

7. Install the balance shaft drive gear. Refer to Balance Shaft Installation   for alignment of the balance shaft drive gear and the driven gear.
8. Install the valve lifters. Refer to Valve Lifter Replacement   .
9. Install the timing chain and camshaft sprocket. Refer to Timing Chain and Sprockets Replacement   .
   Fig 2: Installing Camshaft Retainer

   Courtesy of GENERAL MOTORS CORP.