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very slight gearbox whooooffff noise?
bajachris88 - August 25th, 2011 at 11:01 PM

i notice that when i have my baja on, if i engage the clutch, a very low volume, low pitch kinda smooth noise comes from the transmission.

It sounds almost the same as a failed wheel bearing on say a ricer fwd car, cept alot smoother, and faint.

If i disengage the clutch (motor no longer driving the gearbox) it stops. It this something i should be alarmed about?

could it just be noise being transmitted into the cabin because of the gearbox mid strap tensioned on the rear forks not having rubber? or because the shifter linkage is also solid mount allowing such noise to be heard?

all gears work, and didn't pop out when i took it for a spin. maybe it just needs a run in after sitting so long perhaps...

Anthiron - August 25th, 2011 at 11:13 PM

Throw out bearing (Probobly not)

My bad, read the question wrong.

Nicko

bajachris88 - August 26th, 2011 at 12:10 AM

hmm. was brand new. maybe flawed. Thanks Nick will have an investigation. :tu:

bajachris88 - August 26th, 2011 at 12:14 AM

wait i probably got my wording wrong... the throw out bearing wouldn't make that noise would it if i didn't have my foot on the clutch? or only if i did?

i put my foot on the clutch and it stops the noise...

HappyDaze - August 26th, 2011 at 08:14 AM

OK, so I'm no help........is it a 'dog' box?:lol:

1916baja - August 26th, 2011 at 08:41 AM

Pretty sure the throw out bearing will be noisy if you have your foot off the clutch, push it in, the noise goes away.... i think. I don't think i've ever had a completley silent throw out bearing... Always new ones. i think it probably amplifies the sound because of the way the gearbox is mounted. My kombi box was as noisy as hell, but i couldn't kill it!

Mick.

matberry - August 26th, 2011 at 09:02 AM

Sorry Chris, sounds like main shaft bearing in box to me. Not throwout, they will start thr noise as soon as the bearing contacts the running ring.

Clutch in, goes away, clutch out, noise, worse cold on initial start up.

Joel - August 26th, 2011 at 02:47 PM

Quote:
Originally posted by 1916baja
Pretty sure the throw out bearing will be noisy if you have your foot off the clutch, push it in, the noise goes away....


Other way around, the throw out bearing is only spinning when you have your foot on the clutch.

Agree with Matt, sounds like the main shaft bearing if it's doing it in all gears as well as neutral.

Silly question but did you check or change the oil before you started driving it?

bajachris88 - August 26th, 2011 at 06:06 PM

yea its got fresh hypoid gear oil :P, filled till the fill hole.

ah well... will just drive and see how long it lasts i guess lol.
the idea of it being a bearing inside doesn't sound very good at all!

I guess a kombi 3 rib lucky dip at $100 a pop would be the solution if it eventually becomes a problem. :)

bajachris88 - August 26th, 2011 at 06:16 PM

Quote:
Originally posted by matberry
Sorry Chris, sounds like main shaft bearing in box to me. Not throwout, they will start thr noise as soon as the bearing contacts the running ring.

Clutch in, goes away, clutch out, noise, worse cold on initial start up.


OUt of curiosity, later down the track what can i expect to happen to this 'dog' (:lol:) box if i keep driving?

I haven't taken it for a very long drive, i guess i will just play it by ear.

matberry - August 26th, 2011 at 07:57 PM

Quote:
Originally posted by bajachris88

OUt of curiosity, later down the track what can i expect to happen to this 'dog' (:lol:) box if i keep driving?




It'll get worse, how quickly is the point. Really depends on the failure, can be weeks or years, so suck it and see. It'll tell you every startup how it's going. The worse the bearing gets, the more damage occurs to other components from contaminants and the two shafts getting further apart causes the gears to wear excessively.