Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 1998 >> Corvette V8-5.7L VIN G >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Cylinder Head Assembly >> Valve Spring >> Service and Repair
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Valve Spring: Service and Repair

REMOVAL PROCEDURE

^ Tools Required
- J 22794 Spark Plug Port Adapter
- J 38606 Valve Spring Compressor (Head-on)
- J 42078 Valve Stem Oil Seal Installer






1. Remove the valve rocker arm covers.





2. Remove the valve rocker arms, pedestal, and valve pushrods.
3. Remove the spark plugs from the cylinders to be serviced.





4. Install J 22794 into the spark plug hole.
5. Apply compressed air in order to retain the valves in the closed position.





6. Compress the valve spring (4) using J 38606.
7. Remove the valve stem keys (2).
8. Remove the valve spring (4).
9. Remove the valve spring cap (3).
10. Remove the valve stem oil seal (5).

INSTALLATION PROCEDURE

IMPORTANT: The valve stem oil seal alignment and position on the valve guide is critical.

An improperly installed valve stem oil seal may lead to excessive oil consumption, increased vehicle emissions, or component damage.





1. Install the valve stem oil seal (5) onto the guide (7)
1.1. Lubricate the valve guide (7) and valve stem (5) oil seal with clean engine oil.
1.2. Install the valve stem oil seal onto the valve stem. Push the seal down until the seal contacts the valve guide.
1.3. Use the J 42078 in order to install the oil seal.
Push or lightly tap the tool until the tool bottoms against the valve spring shim (6).






2. Measure the valve stem oil seal for the properly installed height.
There should be a 18.11 mm to 9.1 mm (0.712 inch to 0.752 inch) gap between the top edge of the oil seal body and the shim spring seat surface.





3. Install the valve spring (4).
4. Install the valve spring cap (3).
5. Install the valve stem keys (2).
5.1. Use grease to hold the keys (2) in place and remove J 38606.
5.2. Make sure the keys (2) seat properly in the groove of the valve stem (10 and 12).
5.3. Tap the end to the valve stem (10 and 12) with a plastic faced hammer to seat the keys (if necessary).






6. Disconnect the J 22794.





7. Install the spark plug.
^ Tighten the spark plug to 15 Nm (11 ft. lbs.).

8. Install the valve rocker arms, pedestal, and valve pushrods.





9. Install the valve rocker arm covers.
pro multis · About Operation CHARM