NISSAN PU 1995 4cyl Trans noise

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  #1  
Old 12-21-07, 10:05 AM
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NISSAN PU 1995 4cyl Trans noise

My truck is standard 5 speed. For quite a while whenever I press the clutch, there is a loud whining deep sound coming frm the trans. casing. It stop when I release the (engage) the clutch pedal. It sound like a gear lightly rubbing against another gear at medium rpm's. Speed or engine rpm will not change the tone (frequency) of the noise. It is an intermittent problem. Anybody familiar Nissan PU trans and this noise?? I suspect it is the throw out bearing but not sure.

PS I don't want to drop the trans to verify this...too lazy.
 
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  #2  
Old 12-21-07, 07:33 PM
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The only thing that would do that when you do what you're doing is the throw out bearing. That sort of sits between the clutch/pressure plate and the transmission.

If you don't replace it, there's a good chance you'll tear up your pressure plate at the pressure release fingers.

Hope this helps,

Bob
 
  #3  
Old 12-22-07, 05:51 AM
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Would his setup include a pilot bearing? Last tranny I had that made a similar noise (long time ago, '74 Celica), it needed pilot bearing replaced.

Either way, tranny has to come out of course.
 
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Old 12-22-07, 06:37 AM
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Pilot bearing or bushing, probably the latter. With the whining/rubbing noise I would say throwout bearing, but a pilot bushing in the flywheel completely gone would have some noise with it that could change with clutch engagement. I used to do a lot of 454 s that would lose the pilot bushing in the flywheel. Those things would really rattle around.

Like you say, TG the thing has to come out to fix it. At least he isn't dealing with a Muncie, he and a friend should be able to wrestle that one in there.
 
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Old 12-22-07, 11:02 AM
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And it's RWD; another plus.
 
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Old 12-23-07, 09:04 AM
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Thanks for your responses. My suspicions have been confirmed. I guess I must replace the TO bearing and the pressure plate since it might have incurred in some damage(pressure plate that is)??
 
  #7  
Old 12-23-07, 10:55 AM
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Let me clarify in terms of damage to the pressure plate. You wouldn't have damage to the pressure plate until the throwout bearing locks up and the race of that bearing which faces the pressure plate fingers grinds into the release fingers.

Since you have a problem in it's initial stages, at this point, you probably haven't damaged anything, except the bearing itself. Assuming the bearing is at fault (which would be my guess), that bearing is all you would have to replace.

Hope this helps,

Bob
 
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