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M vibration

A

Anonymous-0

Well-known Member
I just bought 46 M that was originally my wife's grandpa's. It is in good shape but it has enough of a vibration at anything over low idle to rattle the toolbox lid and drawbar. I was thinking that a bearing in the trans might be worn but this afternoon I was looking it over and found that the lip of the waterpump pulley on one side of the belt is broken off about a quarter way around. Would this be out of balance enough to cause a vibration? It is probably not good on a waterpump enyhow eh? How would you go about repairing that?
 
i have seen many of these pulleys broken, due to people not knowing how to change the fan belt.there is a set screw in the one half, that you loosen to turn that half to either tighten the belt or spread it to change the belt. but anyway, no its not going to give you the vibration your talking about.i would look from flywheel back.does it stop if you step on clutch?
 
Can rule out trans by pushing in clutch while running the motor. The pulley shouldn't vibrate the whole tractor.Sounds like maybe flywheel or something along that line out of balance. Hope this helps. Always remember free advice is worth half the cost.
 
It moderates a little bit but not much. There is also what I call gear noise most notably in reverse, not grinding just some noise.
 
In neutral clutch pushed in vibrates =flywheel forward {motor}. If it vibrates in neutral untill you push the clutch in then stops =flywheel back{transmition}If it only happens when tractor is moving not sure.
 
I vote for an issue with the Pressure plate in the clutch assembly. (the fan pulley needs to be replaced, buy a good one and study it, then (reading the manual) replace the broken one)
A bent or broken fan blade will cause the vibes, but that is pretty obvious.
The clutch can be removed out the bottom WO splitting the tractor. If you remove the clutch assembly you can start it to see if it still shakes. JimN
 
All H's and M's vibrate to a certain extent since they were new. The four cylinder engine is inhertlently unbalanced. Thats why modern four cylinder gas and diesel engines have balance shafts. My Super H and Super M both rattle the drawbar to some extent with the H being a bit worse.
 
Do not know how bad your vibration is but as has been said some vibration is normall. My earliest memory of tractors is our nieghbor stopping by on his near new F30 on his way to field and I was always fascinated by pins dancing in drawbar.
 

C-248 engine originally came equipped with cast iron pistons. Generally when replaced the new ones were Aluminum. If the engine is balanced for a heavier cast iron piston / rod assy then by going to an aluminum piston / rod assy will cause the rotating assembly to be out of balance. Generally at low rpm, such as these engines run, it isn't all that noticeable. Start pushing rpm up a bit, say the 1900 - 2000 rpm area and it becomes noticeable. My M w/ firecraters is exactly this way.

Over the years who knows what has been done to your engine. It very well might have a mixture of parts from bore to bore if maybe only one piston was replaced, etc. This would have a more adverse effect on harmonics within the engine.

An M is an internally balanced engine meaning that the balance is achieved via the crankshaft by removing or adding material to the crank throws to balance against the piston / rod assembly. There is no harmonic balancer on the front of the crank (unlike the majority of your car and truck engines) and flywheel balance is neutral.
 
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