Cylinder Head
TOOL REQUIRED^ J 36660 Torque Angle Meter
^ J 8062 Valve Spring Compressor
^ J 36017 Valve Guide Seal Remover
DISASSEMBLE
1. Remove the coolant outlet.
2. Remove valve train components.
NOTE: Ensure that the valve train components are kept together and identified in order for proper reinstallation in their original position.
3. Compress the valve spring. Use the valve spring compressor.
4. Remove the valve keys.
5. Slowly release the valve spring compressor from the valve spring assembly.
6. Remove the retainer.
7. Remove the spring.
8. Remove the spring seat (exhaust only) or valve rotator (intake only).
CAUTION: Do not damage the valve guide. Remove any burrs that have formed at the key groove by chamfering the valve stem with an oil stone or a file.
9. Remove the valve seal. Use the valve guide seal remover.
10. Remove the rotator with intake only.
11. Remove the valve.
ASSEMBLE
1. Install the new cylinder head plug. Coat the plugs with Head Gasket Sealer GM P/N 1050026 or equivalent.
CAUTION: In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.
2. Install the valve mechanism.
3. Install the valve spring retainers.
4. Install the coolant outlet. Tighten the bolts to 26 Nm (19 lb ft).
CAUTION: Clean the valve guides before reaming. Packing of chips or carbon may result in the reamer jamming into the valve guide or broken reamer flutes.
5. Use the following steps to measure the valve guide clearance:
a. With a hole gauge, measure the valve guide I.D. With a micrometer measure the valve stem. Compare the valve guide I.D. and the valve stem measurements. Refer to engine specifications for allowable clearance.
b. The valve guides may be reamed oversize and an oversized valve may be installed. Do not knurl the valve guides.
6. Inspect the valve springs. Refer to engine specifications for the tolerances.
7. Look for the following conditions when inspecting the valve springs:
^ Expanded height
^ Unparallel spring ends
^ Spring tension using valve spring tester.
8. Inspect the valve spring seating surface of the valve rotators and spring seats for wear or gouging. Replace as required.
9. Assemble the valves.
10. Use the following steps to measure valve runout:
a. Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are: an indication of concentricity of the valve seat.
b. Clean all traces of Prussian blue.
c. Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicate valve face concentricity.
d. Recondition the valve seat or replace the valves, if required.
11. Install the rotator.
12. Install the new valve seal. Fully seat the seals on the valve guides.
13. Install the spring seat (exhaust only) or valve rotator (intake only).
14. Install the spring.
15. Install the retainer.
16. Compress the valve spring. Use the valve spring compressor.
17. Install the valve keys.
18. Slowly release the valve spring compressor from the valve/spring assembly.
19. Inspect for proper valve key seating.