Gear box whine

[Barry72B]

Hi,
My 1972 MGB gear box whines when in neutral and engine idling, the noise goes away if I press the clutch in or roll the car back or forwards about 1 foot. clean castrol GTX 20w50 in it & up to the high mark.
What could it be?
Thank you,
Barry

 

[Ralph_Y]

Probably normal input shaft noise, if it is just loud enough to be annoying and not frightning.

 

[Barry72B]

Hi Ralph,thanks for the reply.
The noise is annoying and propebly a bearing,is it going to
damage other parts ?
Barry

 

[Ralph_Y]

I have the same type of annoying whine and am living with it until I have to pull the engine and or transmission for other work. One thing you can do is check to see if it is a throw out bearing problem. Car idling, transmission in neutral, reach in and push the clutch in until it <u>just </u>begins to make "contact". you should be able to feel/hear a substantial change if it is the throw out bearing. When I did this = no change. Others that i respect on the boards told me this more or less eliminated the TO bearing from consideration. Perhaps the real experts can correct or modify my advice.

If it is a bearing failure can possibly damage other items. Wait for people who have more experience than I to chime in for a a more definitive answer.

 

[Barry72B]

Thanks, I will test TO bearing & report back.
I also posted on MGB Experience board.
Any safe additive to quiet down the box ?

 

[jlaird]

No additives.

 

[Bugeye58]

Additives to quiet a noisy box are akin to turning the radio up to mask brake noise.
My opinion only, of course.
Jeff

 

[ronzet]

Or thicker oil to increase oil pressure...

The logic of avoiding the unavoidable....IMHO /bcforum/images/%%GRAEMLIN_URL%%/rolleyes.gif

 

[PAUL161]

My guess is with the rest. Input shaft bearing is worn. Mine has a slight bearing noise when idling, but not annoying yet. I wouldn't let it worry you. Naturally, if you have to pull the engine for any reason, I'd put a new one in.JMHO. PJ

 

[Barry72B]

Why dose the noise go away when I roll the car slightly ?
Thanks,
Barry

 

[jlaird]

Input shaft from the rear is turning something that is makeing a difference in the way it all fits together. Bet you knew that.

Shoot I am not a tranny expert or even a non-expert, leave the rebuilding to the pros.

 

[Barry72B]

Thanks Jack, just making sure.
Cheers