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 or the equivalent to the engine oil.

1. Apply clean engine oil GM P/N 12345610 or equivalent, or engine oil supplement GM P/N 1052367 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.
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.
   Fig 1: Engine Camshaft & Bolts

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Refer to FASTENER NOTICE .
5. If reusing the fasteners, apply threadlock GM P/N 12345382 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).

Fig 2: Camshaft Retainer & Bolts
Courtesy of GENERAL MOTORS CORP.
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 timing chain and camshaft sprocket. Refer to Timing Chain and Sprockets Replacement .
9. Install the valve lifters. Refer to Valve Lifter Replacement .
10. Install the A/C condenser. Refer to CONDENSER .
11. Install the radiator. Refer to RADIATOR REPLACEMENT (2.2 L) or RADIATOR REPLACEMENT (4.3 L) .
12. Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
13. Recharge the air conditioning system. Refer to RECOVERY/EVACUATION & RECHARGING .
14. Connect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .