Valve Lifter Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Remove the Valve rocker-arm cover. Refer to Valve Rocker Arm Cover Replacement.
3. Remove the timing belt. Refer to Timing Belt Replacement.
4. Remove the camshaft. Refer to Camshaft Replacement.





5. Remove the six hydraulic valve lash (HVL) adjusters (1) from the cylinder head.

Installation Procedure





1. Pour engine oil through the camshaft journal holes (2).
2. Ensure that the engine oil flows out from the oil holes in the HVL adjuster bores.





3. Apply engine oil around the HVL adjuster.
4. Install the HVL adjuster (1) to the cylinder head.





5. Apply engine oil to the camshaft journal and around all of the cams.
6. Install the camshaft into the cylinder head so the pin hole (1) of the camshaft timing gear in the camshaft is at the lower position.





7. Apply engine oil to the sliding surface of each housing against the camshaft journal.
8. Apply GM P/N 12346240 or an equivalent to the mating surface of the number 1 and to the number 3 housing (1).These housings will mate with the cylinder head.

Important: The camshaft housing number 1 retains the camshaft in the proper position as to the thrust direction. First, install the housing number 1 to the journal number 1. Do not tighten completely.





9. Install the camshaft housing number 1 (1) to the camshaft and to the cylinder head. Install the camshaft housing so the arrow on the housing (2) faces the timing belt side.

Important: Before you secure the camshaft housings to the camshaft journals, apply a light amount of engine oil to the housing bolts





10. Install the two remaining camshaft housings (2, 3) to the journals of the camshaft.

Notice: Refer to Fastener Notice in Service Precautions.





11. Secure the camshaft housings with the housing bolts.
Gradually tighten the housing bolts in sequence. Repeat the tightening process 3 times or 4 times until the bolts are tightened to 11 Nm (97 inch lbs.).
12. Apply engine oil to the camshaft oil seal lip.
13. Press-fit the camshaft oil seal until the oil seal surface becomes flush with the housing surface.
14. Install the camshaft. Refer to Camshaft Replacement.
15. Install the timing belt. Refer to Timing Belt Replacement.
16. Install the valve rocker-arm cover. Refer to Valve Rocker Arm Cover Replacement.