Camshaft Replacement - Right
Camshaft Replacement - Right^ Tools Required
- J 36660-A Torque Angle/Meter
- J 39946 Crankshaft Rotation Socket
- J 44212 Camshaft Holding Tool
- J 44213 Secondary Drive Timing Chain/Sprocket Holding Fixture
Removal Procedure
1. Remove the right camshaft cover.
2. Remove the camshaft position sensor.
3. Rotate the crankshaft using the J 39946 to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation.
Caution: Refer to Camshaft Holding Tool Caution in Service Precautions.
4. Install the J44212 over the camshafts.
5. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when removing the camshaft sprocket bolts.
6. Remove the camshaft sprocket bolts.
7. Install the J 44213 (1) onto the front rail of the cylinder head.
8. Remove the right secondary camshaft drive chain shoe access plug.
9. Loosen the right secondary camshaft drive chain shoe bolt 2 full turns ONLY.
10. Slide the intake and exhaust camshaft sprockets onto the pins of the J 44213.
11. Alternately loosen the camshaft bearing cap bolts a few turns at a time until all valve spring pressure has been released.
12. Remove the camshaft bearing caps.
13. Remove the J 44212 from the camshafts.
14. Remove the camshafts.
15. Remove the camshaft followers.
16. Clean and inspect the camshafts.
Installation Procedure
1. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the roller pivot pocket (2) and valve slot areas (1) of the camshaft followers.
Important: The follower must be positioned squarely on the valve tip, so that the full width of the roller will completely contact the camshaft lobe. If the followers are being reused you must put them back in their original location.
2. Place the camshaft followers in position on the valve tip and the stationary hydraulic lash adjusters (SHEA) (1). The rounded head of the follower goes on the SHLA, while the flat end goes on the valve tip.
3. Clean the camshaft carriers with a clean, lint-free cloth.
4. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft carriers, camshaft lobes (1) and the camshaft journals (2).
5. Place the camshaft in the camshaft carriers with the camshaft sprocket drive pins near the top of their rotation and the camshaft lobes in a neutral position. The camshafts can be identified by a stamping near the rear journal. For example: R-EXH is defined as Right bank Exhaust.
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 to the front of the engine.
^ The number indicates the position from the front of the engine.
^ The "E" indicates the exhaust camshaft.
^ The "I" indicates the Intake camshaft.
7. Apply a liberal amount of lubricant GM P/N 12345001 or equivalent to the camshaft bearing caps.
8. Install the camshaft bearing caps according to the identification marks.
Notice: Refer to Fastener Notice in Service Precautions.
9. Install the camshaft bearing cap bolts in sequence.
9.1. Alternately hand tighten the camshaft bearing cap bolts a few turns at a time until all caps are fully seated.
9.2. Tighten the camshaft bearing cap bolts to 5 Nm (44 inch lbs.).
9.3. Tighten the camshaft bearing cap bolts an additional 30 degrees using the J 3666-A.
10. Align the camshafts.
Caution: Refer to Camshaft Holding Tool Caution in Service Precautions.
11. Install the J 44212 over the camshafts.
Important: Ensure the camshaft sprockets properly engage the camshaft sprocket drive pins and camshafts.
12. Slide the intake and exhaust camshaft sprockets off the pins of the J 44213 and onto the pins of the camshafts.
13. Tighten the right secondary camshaft drive chain shoe bolt.
^ Tighten the secondary camshaft drive chain shoe bolt to 25 Nm (18 ft. lbs.).
14. Install the right secondary camshaft drive chain shoe access plug.
^ Tighten the secondary camshaft drive chain shoe access plug to 4.5 Nm (40 inch lbs.).
15. Remove the J44213 (1) from the front rail of the cylinder head, while carefully holding the camshaft sprockets against the camshafts.
16. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when tightening the camshaft sprocket bolts.
17. Install the camshaft sprocket bolts.
^ Tighten the camshaft sprocket bolts to 120 Nm (89 ft. lbs.).
18. Verify the camshaft sprocket alignment.
19. Remove the J 44212 from the camshafts.
20. Install the camshaft position sensor.
21. Install the right camshaft cover.