425-6612 camshaft assembly CAT engine spare part

Maintenance & Replacement Tips

1. Support the whole shaft during lifting, do not lift by gear to avoid gear shift and shaft bending
2. Mark timing position before removal, gas engine requires high timing accuracy
3. Clean all oil galleries thoroughly and remove debris to guarantee stable journal lubrication
4. Inspect tappets, push rods, valve springs and bearings; replace heavily worn parts together
5. Increase load slowly during break-in, monitor gas pressure, exhaust temperature and vibration to avoid knock

FAQ 

Q：Can 425-6612 gas camshaft assembly replace diesel 3516 camshaft?
A：Not interchangeable. Different gas injection timing and lift will cause engine knock and power loss.

Q：Can the camshaft be reused after light journal scratches are polished and measured?
A：It can be used temporarily if dimension stays within tolerance. Deep grooves require replacement to avoid bearing seizure.

Q：How to store this gas engine camshaft assembly properly?
A：Hang vertically, apply anti-rust oil on gear teeth and cam lobes, cover with moisture-proof film.

Q：Is oil and filter change recommended while replacing this camshaft assembly?
A：New engine oil and filter are recommended to protect new cam lobes from oil impurities.