Escalade V8-6.0L VIN N (2002)
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6. Install J 22794 into the spark plug hole.
7. Attach an air hose to J22794.
8. Apply compressed air to J 22794 in order to hold the valves in place.
9. Use J 38606 in order to compress the valve spring.
10. Remove the valve stem keys (3).
11. Carefully release the valve spring tension.