Exhaust Camshaft Installation - Left Side

Special Tools 

J 45059:  Angle Meter

For equivalent regional tools, refer to Special Tools .

Fig 1: Left Exhaust Camshaft Bearing Journals
Courtesy of GENERAL MOTORS CORP.
1. Clean the camshaft journals, camshaft and the camshaft caps with a clean, lint-free cloth.
2. Apply a liberal amount of lubricant GM P/N 12345501 or equivalent to the camshaft bearing journals (1).
Fig 2: Left Camshaft Identifying Rings
Courtesy of GENERAL MOTORS CORP.
3. Select the proper camshaft by the identifying rings cast into the left exhaust camshaft (2).
Fig 3: Left Exhaust Camshaft
Courtesy of GENERAL MOTORS CORP.
4. Apply a liberal amount of lubricant GM P/N 12345501 or equivalent to the camshaft lobes and the camshaft journals.
Fig 4: Aligning Left Exhaust Camshaft
Courtesy of GENERAL MOTORS CORP.
NOTE: Ensure each valve rocker arm is properly aligned to the valve tip, the valve lifter and the camshaft lobe. Inspect the alignment prior to and after the camshaft caps are tightened to specifications.
5. Place the camshaft in the camshaft journals with the camshaft sprocket drive pins near the top of their rotation (1) and the camshaft lobes in a neutral position. The camshaft can be identified by a stamping near the rear journal. For example: L-EXH is defined as Left Bank Exhaust.
Fig 5: Exhaust Camshaft Bearing Cap Markings
Courtesy of GENERAL MOTORS CORP.
6. Observe the markings on the camshaft bearing caps. Each camshaft bearing cap is marked in order to identify its location. The markings have the following meanings:
   • The arrow should point toward the front of the engine.
   • The number indicates the position from the front of the engine.
   • The "E" indicates the exhaust camshaft.
7. Apply a liberal amount of lubricant GM P/N 12345501 or equivalent to the left exhaust camshaft bearing cap journals.
Fig 6: Left Exhaust Camshaft Bearing Caps & Bolts
Courtesy of GENERAL MOTORS CORP.
8. Install the left exhaust camshaft bearing caps according to the identifications marks.
9. Hand start all the left exhaust camshaft bearing cap bolts.
Fig 7: Identifying Left Cylinder Head Exhaust Camshaft Bearing Cap Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Fastener Caution .
NOTE: Ensure each valve rocker arm is properly aligned to the valve tip, the valve lifter and the camshaft lobe. Inspect the alignment prior to and after the camshaft caps are tightened to specifications.
10. Install the left cylinder head exhaust camshaft bearing cap bolts.
    1. First Pass

       Tighten the camshaft bearing cap bolts to 5 N.m (44 lb in) .

    2. Final Pass

       Tighten the camshaft bearing cap bolts an additional 30 degrees using the J 45059:  meter .