Lotus Elan

Odd Noise

PostPost by: Matt Elan » Wed May 20, 2020 1:48 pm

Now I knoiw its pretty much impossible to diagnose noises over t'internet but I was wondering if the collective knowledge of the site can offer any suggestions. When I drive the Plus 2 I get a light, relatively high pitched rustling noise from the rear end but only when under power - it disappears on a neutral throttle and the overrun.
It sounds like a stone trapped in a disk dust shield - but there aren't any on the rear. As devotees will know I've had both calipers off to refurb them and the handbrake mechanism, and when turning the hubs didn't here the noise. The drive shafts are Hookes type universal joint type and have been very recently regreased, and I can't see anything wrong. It was there before I set about the calipers and greasing the shafts.
As I said its a very 'light' sound, not a bearing knock or grumble/rumble. Its hard to work out where its coming from but in the RHD car it seems to be from the left (near) side so I guess it could be the diff. Any ideas?
Matthew Vale - Classic Motoring Author
1968 Plus 2 - Somewhat cosmetically and mechanically modified
1969 Plus 2S - Currently undergoing nut and bolt restoration
Visit me on matthewvale.com
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PostPost by: oldelanman » Wed May 20, 2020 3:18 pm

Pinion bearing dirt shield touching diff nose?
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PostPost by: Chrispy » Wed May 20, 2020 10:36 pm

I blame the handbrake tree for most of the strange noises in the rear end! It's a bit of a weird design with too many things that have a small amount of movement. I'd start looking there.
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PostPost by: sprintsoft » Wed May 20, 2020 11:15 pm

Hi Matt,

Check if your diff is moving around under power due to soggy rubber bushes on the two bottom tie rods, or if the frustacones are going soft.

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