Author Topic: TDC marks on a 24 hp. Onan (Read 1167 times)

joman · « **on:** January 27, 2018, 03:18:07 PM »

Does any one know exactly where these are located?

Kbeitz · « **Reply #1 on:** January 27, 2018, 03:53:26 PM »

The timing marks, should be visible on the front gear cover, (under the blower housing) it should show, 2 major marks, 25 degrees and 20 degrees plus 1 degree lines in between. Those marks/lines should line up to a timing mark on the flywheel itself. (If you rotate the flywheel slowly, you should see a long harsh mark on the flywheel)

joman · « **Reply #2 on:** January 27, 2018, 06:20:10 PM »

If I remove the hose that goes to carburetor filter housing and look down thru the hole at the fly wheel should I be able to see it or should I remove alt. Belt and pully then remove shroud over flywheel to see it in order to find Tdc to check valve adjustment?

sparks · « **Reply #3 on:** January 29, 2018, 03:37:09 PM »

Here's what I found in the Onan service manual.

joman · « **Reply #4 on:** January 30, 2018, 09:22:18 AM »

I found the Tdc mark on the fly wheel and adjusted the valves. Hopefully I did it correctly. The intake valves were good at .005 but the exhaust valves were to tight had to readjust them to .013

Kbeitz · « **Reply #5 on:** January 30, 2018, 12:00:11 PM »

They will even get tighter after the engine warms up.
I hope it's working good now.

joman · « **Reply #6 on:** February 03, 2018, 06:14:19 AM »

After adjusting the valves I put on a new carburetor and cleaned the breather valve. The engine started right up and seems to be running pretty good without any smoke.

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