Caterpillar 3406 — Adjust Valve Bridge

Adjustments · Engine Valve Bridge

For the Caterpillar 3406, from the Caterpillar operator's manual.

Applies to: Caterpillar 3406

Procedure

1. Valves must be fully closed.
2. If bridge was removed, put engine oil on the bridge dowel in the cylinder head and in the bore in the bridge.
3. Install the bridge with the adjustment screw toward the exhaust manifold.
4. Back off adjusting screw several turns (counterclockwise), making sure it is not in contact with the valve stem.
5. Firmly press straight down on the rocker arm above point of contact with bridge.
6. Turn the adjusting screw clockwise until contact is made with the valve stem. Turn the adjusting screw an additional 30° (one-twelfth turn).
7. Hold the adjusting screw in this position and tighten the locknut to 22 + 3 lb. ft. (80 = 4 Nm).
8. Put engine oil at the point where the rocker arm makes contact with the bridge.
9. After checking the bridge adjustment, make the valve lash adjustment.

Full service-parts list: Caterpillar 3406 →

Source: Caterpillar operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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