In this video I walkthrough the step by step process of adjusting the valves on an overhead valve engine.

Always adjust the valves on a cool engine.

I am working on a Generac 998cc engine that is in a whole home generator. These steps can be used on essentially all OHV engines.

On this engine, adjusting the valves is required after the first 25 hours of operation and then every 400 hours going forward. Always consult your engine’s manual for specifications before starting.

Improperly adjusted valves can create knocking, clacking sounds, loss of power and poor efficiency. In extreme situations cause damage to the valve train, push rods, cam shafts, rocker arms, valve springs and the valves themselves. Out of spec valve clearances can lead to hard starts causing a over crank alarm 1100 .

Although this process may seem daunting, with a little bit of practice you will find it is not that difficult to do.

This video was made on request, as generators are often something that are overlooked until they are needed. Unfortunately some viewers were affected by this hurricane season, and their generators are now running 24/7. I hope this video helps keep you and your families safe during this tragic time.

As always, please do not hesitate to reach out with feedback, comments or questions in the comments section, and I will do my best to respond or to point you in the right direction.

Thanks for tuning in, and remember Repair It! Don't Wreck It.

Roger