Bus Conversions dot Com Bulletin Board
July 25, 2014, 01:49:44 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: This BB is intended for the sole purpose of sharing conversion and bus related information among visitors to our web site. These rules must be followed in order for us to continue this free exchange of info. No bad mouthing of any business or individual is permitted. Absolutely no items for sale are to be posted, except in the Spare Tire board. Interested in placing a classified or web ad, please contact our advertising dept. at 714-903-1784 or e-mail to: info@busconversions.com.

   Home   Help Forum Rules Search Calendar Login Register BCM Home Page Contact BCM  
Pages: [1]   Go Down
  Print  
Author Topic: Throw Out Bearing Noise  (Read 431 times)
tom120
Newbie
*
Offline Offline

Posts: 21




Ignore
« on: May 29, 2012, 08:56:00 PM »

my 47 Clipper has a throw out bearing that hums when the clutch pedal is depressed.  been that way for almost 20,000 miles with no change. anybody have the same issue? thanks
Logged
bevans6
Hero Member
*****
Offline Offline

Posts: 4535


1980 MCI MC-5C




Ignore
« Reply #1 on: May 30, 2012, 11:36:47 AM »

Not that I have a '47 clipper, or have any idea what kind of gearbox or clutch is in it, but yes, I have had a bad throw-out bearing before.  It can sometimes be confused with a bad pilot bearing.  The pilot bearing is in the tail of the crankshaft and the nose of the input shaft to the gearbox rides in it.  Throw out bearings can go bad such that they "sing" when they are under pressure with the clutch in, and they can hang up so they "sing" when the clutch is out.  The throw out bearing can be fine and the clutch can be bad - the discs can be loose or the fingers can be broken, or the springs can be bad.  Now, in my case (1980 MC-5C 8V-71 Spicer) I found that I had a bad throw out bearing (lack of lubrication, noticeable roughness when spun), an almost seized pilot bearing, some broken springs in the clutch cover and mis-adjusted clutch fingers.  No noise and it all worked just fine, I found it when I took the engine and gearbox out for another reason.  Moral of the story - sometimes you gotta look and see...

Brian
Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
tom120
Newbie
*
Offline Offline

Posts: 21




Ignore
« Reply #2 on: May 30, 2012, 07:01:00 PM »

good points all brian. this is a singer when pedal is down. otherwise everything sounds and works fine. will have to take a look i think. thanks. tom
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!