Vibration Free Lotus Sunny Days

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Vibration Free Lotus Sunny Days

Postby Fredjohn » Sun 18.06.2017, 19:52

At last, gorgeous hot sunny weather arrives to let us get out and enjoy the English country roads :D :D :D

A 100 mile round trip to Banbury and back through the side roads of Worcester and Warwickshire (and a bit of Oxfordshire too) proved to be very enjoyable and a decent test of the 2 new drive-shafts I have fitted. All the horrible vibration I had between 50 and 70 mph has disappeared to be replaced by smooth effortless acceleration in that important range for x country driving. What a joy: totally reminded me of what I love about our cars. Avoided the motorways completely, which would have been a lot quicker but completely boring.

Top down motoring at it's very best. :burnout: :burnout: Life can't get much better.......well it will after July 20th... :D :D :D
La vie passe vite: vivez la avec elan(s).

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Re: Vibration Free Lotus Sunny Days

Postby Giniw » Mon 19.06.2017, 10:29

:clap:

As for the vibration, mine too recently developed a vibration around 60 mph and while accelerating. Was that the same symptom you had?
I checked the shafts quickly, they don't look that bad in my own opinion but I am not a shaft specialist so ... The straight short shaft bearing on the right side might be a little loose, but again I don't know as I have no reference. Should it be radially rock solid?

(Incidentally, where did you find your shafts? :lol: )
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Re: Vibration Free Lotus Sunny Days

Postby Fredjohn » Mon 19.06.2017, 11:45

Giniw wrote::clap:

As for the vibration, mine too recently developed a vibration around 60 mph and while accelerating. Was that the same symptom you had?
I checked the shafts quickly, they don't look that bad in my own opinion but I am not a shaft specialist so ... The straight short shaft bearing on the right side might be a little loose, but again I don't know as I have no reference. Should it be radially rock solid?

(Incidentally, where did you find your shafts? :lol: )


Symptoms happened on acceleration between 50 and 70mph (80 and 112kph). If you look at WSM Section FF13 Page 35, these symptoms are described as being caused by worn INNER joints, not the outer CV joints which when worn "click" on full lock. Very difficult to check the fault by hand. I just trusted my judgement that both inner joints needed replacing. I am sure there is a way to tell which side is bad, but I don't know it!!! Anyone???

Parts are still listed at SJ Sportscars under: transmission: final drive. They list both sides, either full shafts, or half shafts which are the inner joint and shaft only without the CV joint/stub axle for the hub bearing.

Also check that the big block at the back of the engine, which holds the intermediate (jack) shaft bearing is tight. This is held on with 2 bolts into the engine block on your passenger side. These bolts can work loose and result in the jack shaft vibrating a bit. Tighten to torque setting the 2 bolts (17mm spanner I think).

Also check the obvious of tyre balance and wheels not buckled. If it is only on acceleration it probably is the driveshaft(s).

Bon courage mon ami!!!
La vie passe vite: vivez la avec elan(s).

Elan S4 DHC 1969
Elan SE turbo 1992
MB CLK 320CDi 2007
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Re: Vibration Free Lotus Sunny Days

Postby Giniw » Fri 04.08.2017, 12:37

Thanks Fredjohn, I haven't had time to address that already and was planning it more as a winter job but ... it may have been a bad idea to delay because it looks like only the LH side is available at SJS, isn't it? (and strangely the full LH side is cheaper than only the inboard part ... ?!)
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Re: Vibration Free Lotus Sunny Days

Postby markv » Fri 04.08.2017, 13:37

I had a vibration problem, but I think at slightly lower speed and while driving in a straight line. Turned out one of the front wishbones needed replacing, and that cured the problem, making the car much more fun to drive!
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Re: Vibration Free Lotus Sunny Days

Postby Giniw » Fri 04.08.2017, 13:50

Interesting, thanks! Did it have an obvious weakness structurally?
My RH lower front wishbone is indeed a bit rusty (a little hole in the lower plate :/).
I may have a closer look soon to check it's not gone worse than before!!

(I am still expecting it's just the intermediate shaft bearing but ... that's probably an optimistic guess. In the meantime as I drive it gently my fuel efficiency has suspiciously raised :lol: )
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Re: Vibration Free Lotus Sunny Days

Postby markv » Sat 05.08.2017, 00:52

Giniw wrote:Interesting, thanks! Did it have an obvious weakness structurally?
My RH lower front wishbone is indeed a bit rusty (a little hole in the lower plate :/).
I may have a closer look soon to check it's not gone worse than before!!

(I am still expecting it's just the intermediate shaft bearing but ... that's probably an optimistic guess. In the meantime as I drive it gently my fuel efficiency has suspiciously raised :lol: )

It was a long time ago, but I think mine was seriously rusty. I managed to source a second hand replacement from someone on here.
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