Caterpillar C-3406B / C-346 — Valve Adjustment Procedure
Adjustments · Engine valves and slave pistons
For the Caterpillar C-3406B / C-346, from the Caterpillar service manual.
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Procedure
- With the engine at CYL. 1 TDC set the exhaust valves on cyl. 1, 3, 5, the intake valves on cyl. 1, 2, 4 and the slave pistons on cyl. 1, 3, 5.
- With the engine at CYL. 6 TDC set the exhaust valves on cyl. 2, 4, 6, the intake valves on cyl. 3, 5, 6 and the slave pistons on cyl. 2, 4, 6.
- Adjust the intake and exhaust rocker lever clearance to 0.015 in (0.38 mm) for intake and 0.030 in (0.76 mm) for exhaust.
- Torque the rocker adjusting screw lock nuts to 22 lbft (30 N·m).
- After setting exhaust valve clearance, with the exhaust valve closed and the bridge loose, set the slave piston clearance.
Tools required
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake lash 0.015 in (0.38 mm)
- Exhaust lash 0.030 in (0.76 mm)
- Lock nuts 22 lbft (30 N·m)
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.