Caterpillar — Engine Valve Rotators - Inspect
Maintenance
From a Caterpillar owner's manual covering: 3408C, 3412, 3412C. Check it applies to your exact model before use.
Applies to: Caterpillar 3408C, Caterpillar 3412, Caterpillar 3412C
Before you start
- Wear protective glasses or face shield and protective clothing to prevent burns.
- An improperly operating valve rotator will accelerate valve face and valve seat wear.
Procedure
- Perform after the engine valve lash is set, before valve covers are installed.
- Start the engine according to Engine Starting procedure.
- Operate the engine at low idle.
- Observe the top surface of each valve rotator.
- The valve rotators should turn slightly when the valves close.
- If a valve fails to rotate, consult your Caterpillar dealer.
Full service-parts list: Caterpillar 3408C →, Caterpillar 3412 →, Caterpillar 3412C →
Source: Caterpillar owner'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.