simon61
Forum Newbie
Posts: 5
Reg: 11-19-09
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 11-20-09 02:07 AM - Post#1809034
Hi, I just put my 61 K20 on the road for the first time and discovered I have a loud whining noise that appears to be coming from under my feet. Noise is not there if run on jackstands. It is a stock 6cyl set up. The noise goes away when I push the clutch in. Hopefully someone can diagnose the problem. thsnk you
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 Yellow63
"2nd Year" Gold Supporting Member
Posts: 1555
Age: 50
Loc: Lakeland, Fl
Reg: 11-30-08
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11-20-09 07:20 AM - Post#1809098
In response to simon61
Probably throw out bearing or trans input shaft bearing. Have you checked the trans lube for condition and level?
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Vaughn
"8th Year" Gold Supporting Member
Posts: 11062
Loc: Colorado Springs, CO
Reg: 08-08-04
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11-20-09 08:57 AM - Post#1809161
In response to Yellow63
If it is a low frequency whine, it may just be due to the gears in the transmission - which is normal, all truck transmissions of that era do that.
If it is a higher frequency whine, then that is probably the throwout bearing.
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fritz1990
Senior Member
Posts: 4365
Age: 48
Loc: Kansas
Reg: 02-16-03
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11-20-09 01:25 PM - Post#1809281
In response to Vaughn
Never mind, post without thinkin' 
Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.
Corvettes owned: '74 L48 '77 L82 '78 L82 Silver Anniversary
Don't have a nervous come together!
http://picasaweb.google.com/fritz199090
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Edited by fritz1990 on 11-20-09 01:29 PM. Reason for edit: No reason given.
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simon61
Forum Newbie
Posts: 5
Reg: 11-19-09
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11-20-09 01:47 PM - Post#1809287
In response to fritz1990
Tranny level is ok and does not appear to be dirty. It could be the throwout bearing, I hate to pull the tranny, but will if necessary. When it is in 2 wheel drive on the stands it does not make excessive noise. Today I put it in 4 wheel drive on stands and heard the noise, so I think the problem is in the front. Earlier this summer I had pulled the front cover and did a visual check, everything looked fine. No noticeable wear and nothing broken. Yes, I did refill it. If indeed the front end, what should I be checking for? Also, any idea how difficult is it to rebuild it, if needed. thanks for the replies
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simon61
Forum Newbie
Posts: 5
Reg: 11-19-09
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11-20-09 01:55 PM - Post#1809290
In response to simon61
Vaughn, sorry, I forgot to add, yes it is a high pitched whine that is there as long as the clutch is not pushed in. At about 2ooorpm it is almost unbearable.
Yellow63, what is the trans input shaft bearing? Just the name makes me think it is difficult to fix. thanks
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Yellow63
"2nd Year" Gold Supporting Member
Posts: 1555
Age: 50
Loc: Lakeland, Fl
Reg: 11-30-08
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11-20-09 06:07 PM - Post#1809434
In response to simon61
Thats the bearing in the front of the trans that carries the front input shaft. If thats bad chances are the rest of the bearings in the tranny are also. Hope its just the throw out bearing. 
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simon61
Forum Newbie
Posts: 5
Reg: 11-19-09
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11-20-09 07:03 PM - Post#1809462
In response to Yellow63
Yellow63, I agree, I hope it is the throwout bearing. If it is the tranny, I fear my wife will want to call the junk yard. Repair will depend upon the weather in New England as I work outside. I will post as soon as I am able to replace it.
again, thank you
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Jac
Contributor
Posts: 154
Age: 59
Loc: Northern PA
Reg: 04-04-07
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11-20-09 07:17 PM - Post#1809471
In response to simon61
Do you hear the sound rolling down the road and it goes away when you step on the clutch or is this happening at standstill?
Does the noise go away just as you begin to depress the clutch or do you have to completely disengage for the noise to quit?
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sidworks
Senior Member
Posts: 1835
Age: 65
Loc: Sidney, B.C.
Reg: 12-03-05
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11-20-09 07:24 PM - Post#1809473
In response to simon61
Hi, I just put my 61 K20 on the road for the first time and discovered I have a loud whining noise that appears to be coming from under my feet. Noise is not there if run on jackstands. It is a stock 6cyl set up. The noise goes away when I push the clutch in. Hopefully someone can diagnose the problem. thsnk you
check your drivers side eng mounts for being broken or loose as the only time that it is making a noise is when torque is being applied to the rear wheels when going down the road. when the clutch is in or on stands there is no resistance at the rear wheels. when the torque is applied the drivers side of the eng can lift up if the mounts are broken ore loose on that side. either something to do with your frt belt system or your d/shaft rubbing on something may be giving you a noise
unless you can be more specific that would be my guess as that is the only real thing that I can connect the dots to when the power is applied and your description of events
in regards to the release brg the only time that it is going to make a noise is when it is making contact with the pressure plate. if it is just sitting there with the clutch pedal released it should not be turning, therefore no noise. . if the clutch is not properly adj and the release brg is rotating under poewer then it should be making noise all of the time
stand to reason?
ron
does yor shifter lean to the right when you apply throttle when driving and come back towards you when you take your foot off the throttle
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Edited by sidworks on 11-20-09 07:46 PM. Reason for edit: No reason given.
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simon61
Forum Newbie
Posts: 5
Reg: 11-19-09
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11-21-09 12:51 PM - Post#1809778
In response to sidworks
To all replying to my initial post, my K20 is a 4x4  Sorry about the confusion.
Jac, the noise is very noticeable when if on jackstands I hit about 2000rpm in 4x4. Or when on the road at same rpm. It goes way down when I push in the clutch all the way. Sorry I don't know about while depressing.
Sidworks, I did check the rear mounts as suggested and had to tighten them. As for the noise, it did not matter if on or off the gas. Thank you
I think I have narrowed the majority of the noise down to the front differential, as I d/c'd the front drive shaft and took it for a spin. Very little of 'that' noise. When I drained the fluid it appeared to have some metallic tint to it after only about 5 miles of use, after a drain and fill this summer. I don't remember what that fluid looked like.
So, I think my next step is to pull the cover off the front differential and visually check. Other than missing teeth snd overly visable wear, what should I be checking for?
AS for bearings etc. any suppliers better than others?
Also,how difficult is it to put all new bearings in or should I be looking for a good used unit. If so anyone know what years fit?
thank you
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