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Strange noise

A

Anonymous-0

Well-known Member
My Super M has an unsual noise in the engine, most noticeable on the left side behind the manifold. Just a dull thud like sound. Doesn t really sound like rods or mains. Does vary with rpm, good oil pressure, runs good. Any ideas?? Piston slap, wrist pin?? Thanks in advance to any who care to comment.
 
Before digging too deep in the engine, I'd pull the valve cover & check what's going on up there. Could be valves need adjusted.
Then dig deeper. Could be a piston or rings going South. Wrist pin getting loose---that type of thing.
 
I agree with Brownie.
After eliminating the valve adjustment, and other easy to get at components, go inside.
Use an automotive stethescope to try to isolate the noise. Pull and ground one plug wire at a time to assess if it can be changed with, and isolated to one cylinder. Look at the front pulley to assess if the crank is moving excessively front to back (in and out)
have some one push on the clutch while it is being listened to. Pressure on the Forks pushes on the crank and can dampen the effects of loose thrust bearings.
Chipped constant mesh teeth in the trans can also have sound that dislocates to other places (clutch depression will check this as well.)
Wrench after diagnosis, not before. Jim
 
friend had an 'h' that had a noise sounding like a wrist pin. sometimes get loud with high rpm's. figured, when it get worse, rebuild. as oil got olded/thicker noise got quieter...i bought tractor, used for pulls, sold 5 yrs later, still running.
 
Make sure you haven't sucked up a screw from the carburator choke or throttle plate. We had that happen on an H and it was a knocking sound intermittently, depending on if the screw stuck to the piston on not. We removed the screw through the spark plug hole with a piece of wire and some grease on the end. Roger
 
I had the same thing happen on an M and a screw came out of one of the plates in the carb and got stuck on to of the piston .
I would pull the carb and see if any of them are missing.
 
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