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Home >> Chevrolet >> 1997 >> Corvette V8-5.7L VIN G >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Service and Repair >> Engine Overhaul (Unit Repair) >> Cleaning, Inspection, Rework & Sub-Component Disassembly >> Cylinder Head Disassemble and Assemble

Cylinder Head Disassemble and Assemble

TOOL REQUIRED
^ J 8062 Valve Spring Compressor, or equivalent.
^ J 42078 Valve Stem Oil Seal Installer





DISASSEMBLY

NOTE: Remove the spark plugs from the cylinder head with the components at room temperature. Mark, organize, or sort the cylinder head components for assembly. Return the components to their original location during assembly. Do not remove the cylinder head valve guides (7), coolant core plugs (8), or valve seats (9), unless service is required.

1. Remove the spark plugs from the cylinder heads.





2. Use the Valve Spring Compressor in order to compress the valve spring (4).





3. Remove the valve stem keys (2).
4. Remove the valve spring cap (3).
5. Remove the valve spring (4).
6. Remove the valves (10, 12).
7. Remove the valve stem oil seal (5).
8. Remove the valve spring shim (6).





9. Remove the coolant sensor from the left cylinder head (if required).

ASSEMBLY
1. Clean the cylinder head valve spring shim area.

NOTE: When reusing the valves and related components, install the parts to their original location.





2. Install the valves (10, 12) into the proper port.
3. Install the valve spring shim (6).

CAUTION: 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.





4. Install the valve stem oil seal (5) onto the guide (7).
a. Lubricate the valve guide (7) and valve stem (5) oil seal with clean engine oil.
b. Install the valve stem oil seal onto the valve stem. Push the seal down until the seal contacts the valve guide.
c. Use the valve stem oil seal installer in order to install the valve stem oil seal. Push or lightly tap the tool until the tool bottoms against the valve spring shim (6).





5. Measure the valve stem oil seal for the properly installed height.

NOTE: There should be a 13.1-19.1 mm (0.712-0.752 inch) gap between the top edge of the oil seal body and the valve spring shim surface.





6. Install the valve spring (4).
7. Install the valve spring cap (3).





8. Compress the valve spring (4) using the valve spring compressor.
9. Install the valve stem keys (2).
a. Use grease to hold the keys (2) in place and remove the valve spring compressor.
b. Make sure the keys (2) seat properly in the groove of the valve stem (10, 12).
c. Tap the end to the valve stem (10, 12) with a plastic faced hammer to seat the keys (if necessary).





10. Measure the valve spring installed height using a ruler. Measure from the machined surface of the cylinder head to the top of the valve spring cap.

NOTE: If the installed height exceeds 46.25 mm (1.82 inch), install a valve seat spring shim of approximately 0.5 mm (0.020 inch) thick. Do not shim the valve spring to obtain less than the specified height. Do not assemble the components without a spring shim on the cylinder head.

11. Install the remaining valves (10, 12), springs (4) and other components.





12. Install the coolant sensor into the left cylinder head (if required). Tighten the coolant sensor to 20 Nm (15 ft. lbs.).
13. Install GM P/N 12345382 to the cylinder head core plug (8) holes.
14. Install NEW cylinder head core plugs (8) (if required).
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