Motor knocking

Henry Jr

Henry Jr

Forum Newbie
Snapper model 7800785 series 24 eleven years old
The motor knocks/bangs when I start it. Eventually calms down.
I must be missing some service operation?
 
First question, are you sure it's actually in the motor? Not in a drive or idler component?
 
Scrubcadet10 said:
the engine isn't rocking when you start it is it? sometimes loose engine mounting screws/bolts will cause a knocking noise.
Click to expand...
Just to add to what Scrub said, Normally the knocking will be at start up and shutdown, and sometimes with sudden load changes like engaging the deck. but will appear smooth otherwise while running
 
One last check is to remove everything from the PTO and see if the knocking goes away.
While you are under there get some one to either rotate the engine by hand or crank the engine and check the PTO shaft for wobble
With the engine off see if you can push the crank shaft up, it needs around .010" to .030" free play but any more or any side play indicates a worn case ,
Once you are sure that it s inside the engine the prime culprit then the counter weight would be the most likely cause .
 
You must log in or register to reply here.
Back
Top