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#1
02-17-2021, 10:02 PM
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High Pitch Rattle on a K321
So over the last few months I've been building a loader on my 149. Before I started pulling stuff off there was a fairly high pitched rattle. Not a real squeal or rattle but kind of a combination. The drive line was in poor shape and the pto was sorta seized sorta not and I was pretty sure that's where the noise was from. It sounded exterior, but I couldn't pin point where exactly it was coming from. I fixed the driveline and removed the pto completely. When I fired it up today, to my surprise and dismay, the noise was still there. It sounds a bit like a dry bearing. I loosen the SG belt and that didn't change anything.
The tractor is new to me since fall with just an hour or so of run time and the noise was there when I bought it. Didn't have my hearing aids in when I looked at it and I don't hear high pitches. I don't hear women or children well and I'm ok with that. I have no experience with Kohler's or actually any large single engines other than old motorcycles. Is there a likely culprit, something common with this engine? 
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#2
02-17-2021, 10:29 PM
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Your noise wouldn’t be the shroud screen bent or loose enough to make the sound you are hearing could it?
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#3
02-17-2021, 11:12 PM
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Try standing in front of the engine and listening for it and then stand behind the engine and listen for it. Like the Doppler Effect, you should hear it louder on one end or the other. Try disengaging your manual pto lever once it is running. Chances are it is in your front pto and it could just be the wear button.
EDIT: OOppsss......ignore my comment. I just re-read your post and realized that you have your pto removed from your engine so it cannot be that. Cub Cadet 123
__________________
Still don't know what I'm doing in OHIO?.....If you find me, then please point me back toward INDIANA. 
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#5
02-18-2021, 10:22 AM
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Have you had this engine apart?
1st thing that comes to mind... Cam end play not properly shimmed as in to loose? Take a long screwdriver and hold it tight to your ear and place the end on the engine. May help to ear plug the other ear while doing this. Try it on the cam side, front and back, may help to locate where the noise is coming from. BTW, I'm in the same hearing boat as you.
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#6
02-18-2021, 10:43 AM
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Perhaps the noise resides in your S/G? What is the condition of the brushes and bearing(s)?
Or maybe the head gasket is blown? Or one of the cooling shroud panels is loose? There's a lot of panels that could loosen up and rattle. Just throwing out some suggestions. These Kohlers do shake pretty good, the rattle could be coming from somewhere on the tractor frame rattling due to the engine vibration.
__________________
 '70 107 with k301 engine swap '71 106 with 38" deck '70 147R with factory replacement k321, 42" deck '61 Original with 38" timed deck '63 70 "pinkie" 1863 with 54" deck '46 Farmall H, '50 Farmall Cub 105 x2 (parts)
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