G3516 Petroleum Engines Caterpillar

Removal Procedure

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Illustration 1	g00587197

1. Remove bolts (2), valve cover (1), and the seal.
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   Illustration 2	g01254714

2. Disconnect harness assembly (4) from transformer (3).

   Note: Some engines have a hold-down that must be removed from the transformer.

3. Lift transformer (3) out of the cylinder head.
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   Illustration 3	g01254715

4. Remove O-ring seal (5) from transformer (3).

5. Remove the spark plug from the cylinder head.

6. Repeat the steps for the remaining valve covers and the spark plugs.

Installation Procedure

1. Inspect the condition of the seals and the gaskets. Replace the seals and the gaskets, if necessary.

2. Inspect the condition of the thread on the spark plug. Apply Tooling (A), if necessary.

3. Install the spark plug in the cylinder head. Hand tighten the spark plug. Tighten the spark plug to a torque of 68 ± 4 N·m (50 ± 3 lb ft).
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   Illustration 4	g01254715

4. Install new O-ring seal (5) on transformer (3).
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   Illustration 5	g01254714

   Note: To prevent arcing, tighten the hold down machine screw.

5. Set transformer (3) in the cylinder head. Push down slightly in order to seat transformer (3).

6. Connect harness assembly (4) to transformer (3).
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   Illustration 6	g00587197

7. Install the seal and valve cover (1) on the cylinder head.

8. Install bolts (2).