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post #1 of 15 (permalink) Old 15-04-2017, 14:47 Thread Starter
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Back end 'whine'

Hi, I have a '98 MGF 1.8 VVC, less than 50,000 miles, which has what I would describe as a 'back axle whine'!!! It's speed related from about 30 upwards, not related to engine rpm and its not a wheel bearing or tyre noise. Have drained and refilled the gearbox with Granville Manual Transmission Gear Oil MTF 94 Lubricant Fluid API GL-4 . It occurs whether the engine is cold or hot and is most pronounced under engine load. Disappears when decelerating. Any suggestions would be welcome????

Trev
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post #2 of 15 (permalink) Old 16-04-2017, 09:45 Thread Starter
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No one any ideas?????
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post #3 of 15 (permalink) Old 16-04-2017, 11:34
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No one any ideas?????
Not really!

My 45000miles TF has a "whinier" first gear than when in higher gears, just like my old Midget actually...I changed the oil and it made no difference, so I will just live with it.

Probably more or less normal and every thing works, which is the main thing.

I am certainly not going to take the box out to see if there is a problem!

I suppose a lot depends on the volume of the whine..a muted light whine would be OK but a wailing Banshee type of whine would possibly indicate a bearing failure resulting in mis-meshing of gears, or something.
Also if it suddenly started whining loudly having been quiet before, then that could be cause for concern.
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post #4 of 15 (permalink) Old 16-04-2017, 12:19
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How can you be sure its not a rear wheel bearing, have you replaced both?

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post #5 of 15 (permalink) Old 16-04-2017, 14:07 Thread Starter
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Ian,
I am fairly sure with wheel bearing failures I have had in previous vehicles, the noise increases/decreases with side load, i.e on cornering one way or the other. I know a transverse engine does not have a 'differential' as such, or does it? The 'whine' is not like a banshee, just 'noticeable'! Would applying some Teflon/molybdenum 'additive' like 'Slick' to the gearbox improve matters or is that a no-no??
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post #6 of 15 (permalink) Old 16-04-2017, 19:31
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Personally I would be wary of such additives probably because in the old days there used to be tales of synchromesh, which relies on a certain amount of friction to operate properly, apparently, not functioning properly after introduction of an "anti friction" additive.

Perhaps these days these warnings are not so relevant if the products have been improved, but I would want more information before trying an additive.

There must be a differential in there somewhere! They certainly can whine in back axles but I have not "heard" of such a problem with a transaxle type of diff.
But I am no expert.
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post #7 of 15 (permalink) Old 16-04-2017, 20:39
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They have the "equivalent" of a diff, but built into the gearbox, then feeding the driveshafts.

May be worth trying a thicker grade of oil. or a racing grade fully synth.
Re wheel bearings. If one is just "starting" to fail, you may not get anymore noise when changing direction or loading the bearing.
May be worth just waiting a bit to see if the noise becomes more apparent, but I'd start with perhaps changing the gearbox oil as mentioned.
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post #8 of 15 (permalink) Old 16-04-2017, 22:23
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So, if you put it into neutral and rev the engine it doesn't make the noise?
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post #9 of 15 (permalink) Old 17-04-2017, 00:23
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Also worth noting that it could be the water pump or alternator. These can whine when under load as well. Especially the alternator bearings.
From the description, doesn't sound like wheel bearings or an engine issue though.
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post #10 of 15 (permalink) Old 17-04-2017, 03:45
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Upload a sound clip, lets hear it.

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post #11 of 15 (permalink) Old 17-04-2017, 16:16 Thread Starter
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So, if you put it into neutral and rev the engine it doesn't make the noise?
No only under load on driving CJJ.
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post #12 of 15 (permalink) Old 17-04-2017, 16:18 Thread Starter
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Also worth noting that it could be the water pump or alternator. These can whine when under load as well. Especially the alternator bearings.
From the description, doesn't sound like wheel bearings or an engine issue though.
Sid, thanks. Water pump changed a couple of hundred ago along with HG and belts. Will bear alternator in mind.
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post #13 of 15 (permalink) Old 17-04-2017, 16:20 Thread Starter
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Upload a sound clip, lets hear it.
Have tried to record it but drowned out by the wind-noise and general running. Its NOT that loud, maybe I'm paranoid!!!
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post #14 of 15 (permalink) Old 17-04-2017, 19:00
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Its NOT that loud, maybe I'm paranoid!!!
Join the club!

A bit of deafness can help, sometimes, to ease the paranoia!
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post #15 of 15 (permalink) Old 17-04-2017, 19:18
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Have tried to record it but drowned out by the wind-noise and general running. Its NOT that loud, maybe I'm paranoid!!!
Maybe just leave it a bit longer Trev and see if it get's worse?
May be easier to locate then.
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