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 Input Shaft Bearing?
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cation



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114 posts
S14
Knoxville TN
5-1-2008

  Input Shaft Bearing?


I recently bought a used 95 S14 that's an auto with a 5spd swap.

I know that when the clutch is engauged you are supposed to hear a slight whirring noise from the transmission as the input shaft is spinning inside. I've observed the sound in both my Si and WRX, only in the S14 it seems much louder. The sound goes away when the clutch is depressed/disengauged.

Also when I change gears at RPMs above 4k in 1st and 2nd gear I can hear a strange vibration sound come from the clutch area and I can feel it in the clutch pedal. I used to think that it was the exhaust as the car came with a fart can HKS Hi-power cat back, but now I'm affraid that I may have a wobbly input shaft and/or a bearing going bad inside the transmission.

Is what I describe symptomatic of bad internal transmission bearings?

Some one please help the nissan noob. Thanks!

doubled340



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5 posts

gulf breeze fl
12-3-2007

 « Re: Input Shaft Bearing? (cation)


its the throw out bearing
they probably didnt replace it when they put the 5spd in



daniel,
"thats so JDM"
carmo

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133 posts
92 Accord, 90 Civic, 90 Mustang, 89 240sx
Trying to protect personal investments Virginia
3-11-2008

 « Re: Input Shaft Bearing? (cation)


Does the whirring noise go away in fourth gear and come back again in fifth. This could indicate bad main bearings. Sound as though you may have a couple of problems.
cation



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114 posts
S14
Knoxville TN
5-1-2008

 « Re: Input Shaft Bearing? (carmo)


Quote, originally posted by carmo »
Does the whirring noise go away in fourth gear and come back again in fifth. This could indicate bad main bearings. Sound as though you may have a couple of problems.

Not that I have noticed. The slight whirring sound only occurs in neutral. Every MT car I've had does this, only the 240 seems louder. The vibration sound/feeling doesn't seem to occur in 3rd gear on up, but I usually don't make it much past 4k in either of those gears. I've discovered that I have a few exhaust leaks as well when I was under the car this weekend, so I may be hearing that as well. Another thing I noticed when I've been driving around with the windows down is that when I engage the clutch to shift I can hear a slight squeak/squeal which would support doubled340's theory of a bad TOB.


The car runs and drives fine, so I guess I'll just keep driving it until it gives up the ghost. I have a feeling its my TO bearing though... let's hope anyways, I don't feel like buying and installing another transmission before I go RB next year.

Thanks for the help!

Modified by cation at 5:17 PM 5/18/2008

drksolest
NICO's Crazy Cat Lady



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3976 posts
91 240sx coupe
Knoxville TN
12-18-2007

 « Re: Input Shaft Bearing? (cation)


Bump... you might want to put this in 240 forum to get more hits...




Quote, originally posted by krimsonviper »
i like halo. masterchief is the only guy i'd go gay for.

Rucca

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223 posts

Newark DE
7-19-2007

 « Re: Input Shaft Bearing? (drksolest)


Could also be runout in the flywheel for the vibration. Just drive it if you are going RB soon.

If or when it gets worse, it'll only be like $150 for a clutch kit and flywheel resurface if you can do the labor yourself.

cation



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114 posts
S14
Knoxville TN
5-1-2008

 « 


Thanks for the help guys, and gal...
 

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