Third Gear Whine

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Third Gear Whine

Postby grim_b » 23 Apr 2007, 16:58

Hi all,

Long time no bother you :)

Got a new problem with the old girl. In third gear I get a whine that goes higher in pitch and lower in pitch when in motion. The rate of the noise is in time with the revs and I am worried that it means the end of the gearbox? Can you confirm this for me please?

(Standard 1256 with 55K on the clock. Gears are fine apart from 3rd.)

Also, can I get the third gear cog replaced, or am I looking at another gear box?

Don't want to drive the Mrs's BMW 318, please help :D

Thanks in advance, I hope your all well?

Grim. :D

PS, could this also be a fault with the alternator? not sure if that keeps same pace as engine through the rev range? Noise is louder than engine.... :(
I loved my car, but she has to go.... :(
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Postby Herbie_Flowers » 23 Apr 2007, 18:33

sounds like a bearing is on it's way out, just bypass 3rd if you're that worried :wink: :)
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Postby grim_b » 24 Apr 2007, 07:29

Hello Herb,

I am already bypassing third as I really want to keep the car... :)

Any ideas what I can do to fix it. Please keep in mind I am not very mechanical and have very little time (2 - 3 hours a weekend)

Cheers,
G.
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Postby Gordo » 24 Apr 2007, 07:31

First thing is to check the oil level. If that doesn't help, it would seem to be a bearing on the way out although they're usually more a growl. Whines tend more to be gears.
ttfn

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Postby grim_b » 24 Apr 2007, 07:45

Where are these bearings, can I replace them? How long to do it? etc.

Brilliant as usual people :) thanks.
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Postby Gordo » 24 Apr 2007, 08:40

grim_b wrote:Where are these bearings, can I replace them? How long to do it? etc.

Brilliant as usual people :) thanks.

First, do the oil thing.
If it is a bearing, you should also hear a noise in second and first, getting quieter in the lower gears. This would imply either a laygear bearing or spigot.
What year is the car? the early ones had a single row of needles for the laygear, the later double row.
If it just shows up in third, you may have worn gears or thrust washers.

It's not actually a difficult job if you've a manual, some mechanical sense and, unfortunately, access to a press for removing the gears and/or main (input and tailshaft) bearings.
TBH, I'd probably just overfill the box a little and live with it while looking for a complete box to swap. You may also find a gearbox reconditioner with one gathering dust on the shelves - but I'd be surprised. They may also be your best bet for replacement bearings/rollers.
ttfn

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Postby grim_b » 24 Apr 2007, 09:28

Great reply, thanks.

The car is an '82.

Sounds like I should pay someone to do this job. I don't have the confidence to go ripping the insides of my car out....

Any offers? :D

Thanks.
G.
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Postby Herbie_Flowers » 24 Apr 2007, 20:17

stripping a 'box is not for the faint hearted or mechanically inept and you won't have the right tools anyway. best bet is to get a second hand one for less than £50 and fitting it in place of yours, then you can open up the old one and "play".
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Postby CancerWagon » 29 Apr 2007, 23:22

A start to prolong the life is changing out the grarbox oil for some fresh stuff, getting any possible suspended metal out of the thing.

My 1978 had a "coffee grinder" 4 speed gearbox, 1 thru 3 were loud as all heck and 4th was perfect. Be gentle and it should last okay. A used gearbox in good nick is the easiest solution by far. Good time to install a fresh clutch too. :wink:
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Postby grim_b » 01 May 2007, 22:53

Bit of a cheeky question but can someone tell what oil they would recommend? Got a local Halfords, not much else though.....

:(
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Postby CancerWagon » 02 May 2007, 15:44

High quality 80-90w oil, unless otherwise specified. Most respectable parts shops should be able to look it up somehow. Be sure before you fill it!

Only exception for 80-90w to my knoledge:
5 speed gearbox for the 1600cc engine, whish uses 15w40 for some reason :?
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