Caterpillar C-3406B / C-346 — Bridge Adjustment
Adjustments · Exhaust/intake valve bridge
For the Caterpillar C-3406B / C-346, from the Caterpillar service manual.
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Procedure
- Put clean engine lube oil into the bridge bore and install the Jacobs Exhaust Valve Bridges.
- Back off the adjusting screw several turns making sure it is not in contact with the valve stem.
- Press firmly and straight down on the top of the bridge.
- Turn the adjusting screw clockwise until contact is made with the valve stem, then an additional 20 to 30 degrees.
- Hold the adjusting screw and tighten the locknut to 24 lbft (32 N·m).
- Put clean engine lube oil on the area where the rocker arm contacts the bridge.
- Adjust the intake valve bridges at this time using the same procedure.
Specs & values
- Locknut torque 24 lbft (32 N·m)
- Additional turn after contact 20 to 30 degrees (1/4 flat of locknut)
Source: Caterpillar service 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.