Cylinder Head Assemble

Tools Required 

• J 8062  Valve Spring Compressor
• J 42073  Valve Stem Seal Installer

Important:  The exhaust valve oil stem seal has the letters EX (1) molded into the top of the seal. The exhaust valve oil stem seal material is brown in color (2) with a white stripe (3) painted onto the outside diameter of the seal, or the material may be red in color (2) with no paint stripe. The intake valve oil seal is black in color.

1. Assemble the valve into the proper valve guide.
2. Select the proper valve stem oil seal for the specific valve guide.
3. Lubricate the valve stem oil seal and the outside diameter of the valve guide with clean engine oil.
4. Assemble the valve stem oil seal onto the valve stem.
   Fig 1: Installing Valve Stem Oil Seal Onto Valve Guide

   Courtesy of GENERAL MOTORS CORP.
5. Using the J 42073  , install the valve stem oil seal onto the valve guide.
   1. 5.1. Tap the valve stem oil seal onto the valve guide until the J 42073  bottoms against the valve spring seat.
   2. 5.2. Inspect the valve stem oil seal. The valve stem oil seal should not be bottomed against the valve guide.

      There should be a 1-2 mm (0.03937-0.07874 in) gap between the bottom edge of the valve stem oil seal and the valve guide.

      Fig 2: Checking Gap Between Bottom Edge Of Valve Stem Oil Seal & Valve Guide

      Courtesy of GENERAL MOTORS CORP.
6. Install the valve spring (3).
7. Install the valve spring cap (2) onto the valve spring (3), over the valve stem.
   Fig 3: Installing Valve Spring Cap Onto The Valve Spring Over Valve Stem

   Courtesy of GENERAL MOTORS CORP.