Lotus Elan

Singing Diff

PostPost by: Stuart+2 » Thu Aug 21, 2008 12:40 am

My diff doesn't leak (PO has done seals & bearings etc) but starts to gently whine at 50mph on moderate throttle - either back off or hit the pedal and it stops.

It sounds like a bad alignment of pinion and crownwheel might be the cause but, in any case, I'm not sure how much of a worry this is.

Advice greatly appreciated.
Stuart - Sydney
1968 +2 50/1035
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PostPost by: ceejay » Thu Aug 21, 2008 9:31 pm

G'Day Stuart.
The diff (3.5) in my elan does the same... but it has done a big mileage, if a diff has been reco'd the preload setting may be the cause. But the 3.9 diff I sometimes use is very quiet at all times.

Several decades ago I had a triumph from new and the diff had a bad period whine at 100KPH... it was stripped and reset three times in the workshop... it made no difference, simply gave up on it in the end.

Col
From Victoria.
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PostPost by: miked » Fri Aug 22, 2008 1:39 pm

Stuart,

I just went through the same experience. I posted it.

New Drive shafts
New top diff mounts
New bottom mounts
In the end a fresh Diff' rebuilt by an expert
Red line oil.
Ran it in etc.l

I have virtually go rid but there is still a little whine as you say when not under heavy load or not coasting. I would live with It. Must have put ?650 into this. By the time I got the newer diff', the old one (that had been rebuilt) was starting to become more quiet.

If everything is sound in the area and you have no vibration, I would run it. You could try some Red Line diff' oil as Rohan suggested.

Regards Mike


PS Sorry, could not resist, what is it singing? Elvis :lol: :wink:
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PostPost by: Stuart+2 » Sat Aug 23, 2008 2:31 am

Thanks guys - I'll tuck the cash I would have spent into my ears.

Redline diff oil it is.

Mike - I think it was singing either "Across the Universe(al)" by John Lennon or "Ring(gear) Ring(gear)" by Abba
Stuart - Sydney
1968 +2 50/1035
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