Valve clearance setting procedure needed?

Hello Natasha,

The valve clearance on this engine is not directly adjustable.
The valve tappets determine the clearance, if not within specification they will need to be replaced

To check
Remove the valve/rocker cover
Rotate the crankshaft pulley in the direction of engine rotation, aligning the pulley groove with the 0 point on the cover, in order to set engine to TDC. See image 1
Measure the valve clearance at positions (1), (2), (6) and (8). See image 2
Rotate the crankshaft pulley 360 degrees in the direction of engine rotation.
Measure the valve clearance at positions (3), (4), (5) and (7). See image 2
If the measured values are not within specifications, replace the valve tappets. Use a micrometer to measure the tappet thickness. See image 3 and 5

Specifications

Inlet Side: 0.075-0.125 mm
Exhaust Side: 0.245-0.295 mm

Determine the tappet size. Refer to determining replacement tappet size.
. Remove the old tappet.
Measure the old tappet.
Perform the following calculation to determine the replacement tappet size:
Specifications

Inlet: value of removed tappet + measured clearance - 0.1 mm = new tappet size
Exhaust: value of removed tappet + measured clearance - 0.27 mm = new tappet size

Example:
- Old tappet = 3.20 mm, clearance was 0.30 mm, Intake clearance value is 0.1 mm
- 3.20 mm + 0.30 mm--0.1 mm = 3.40 mm
- 3.40 mm = 96449615 (part number)

In image 4 is a list of available tappets from GM, part numbers and clearances

Hope this helps.

Cheers, Boris

Hello Natasha,

Please let us know if you need any other information.

Cheers, Boris