Forum Discussion

Class_A_DP_1's avatar
Class_A_DP_1
Explorer
Feb 27, 2016

Onan Marquee Generator wont crank with plugs installed?

Hi, The starter on my Generator will crank and spin the engine freely with the plugs out. When I install the plugs it has good compression but will only spin the motor a 1/2 revolution or so then stop...
Class A
prstlk's avatar
prstlk
Explorer
Feb 27, 2016
I would suggest stuck valve(s). That would explain why it cranks with the plugs out. I am not familiar with this engine or how the valve train is set up. Pushrods, direct from cam, chain or belt. Maybe someone on this forum could shed more light on this theory.
Good luck and keep us posted on what you find.

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