Tools Required

J 37868 Oil Passage Plug Installer

1. Use the following steps to remove the oil passage plug:

1.1.	Using an 8.33 mm (21/64 in) bit, drill the oil passage plug.

1.2.	With a 10.0 mm (0.3937 in) bottoming tap, thread the plug.

1.3.	Install a 10.0 mm (0.3937 in) bolt into the plug and pull the plug out and discard.

2. Clean the oil passage plug hole.
3. Install the new oil passage plug. Use the J 37868 .
4. Inspect the camshaft sprockets.
5. Inspect the camshaft sprocket bolt threads.
6. Inspect the bearing surfaces, lobes and the camshaft position reluctor for the following conditions:

•

Wear

•

Galling

•

Gouges

•	Overheating and discoloration

Important: Do not attempt to repair the camshaft, replace it if it is damaged. If a new camshaft is installed, the valve lifters actuated by that camshaft must also be replaced.

7. With a micrometer measure the bearing journal diameter. Replace the camshaft if the measurement is out of specification.

Important: If a new camshaft has been installed, add Engine Oil Supplement GM P/N 1052367 or equivalent to the engine oil.

8. Coat the entire camshaft with Camshaft and Lifter Prelube GM P/N 12345501 or equivalent.