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1977 S1 - engine rubber mount swap instructions


hml_xy

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Dear forum,

i searched and found helpful informations regarding the engine stabilisers to get rid of the forces the engine is putting on the rubber mounts in cornering and also found the heat shield. But now I am in a situation that my Esprit S1 requires new rubber mounts and I´d like to use the nasty winter to get them replaced.

Being based in Germany, there are only a few "specialists" around that have experience with working on Esprits. And all of them are a couple of hours away from where I am based. I was lucky to find a small historic car garage that specialises in UK manufacturers and is often working on Jags, Rolls, Bentley etc. He´s also not afraid of working on the Esprit, but has never done the engine mount swap.

Does anyone have any hands-on tipps that I can forward to him before bringing my car over? E.g. is this definitely a task where the engine has to be removed?

I would also ask him to build me one of the stabilisers mentioned in the thread here, or is it easier to buy a kit from somewhere (SJ, ...? )

 

He will also then swap the timing belt and all other parts that are typically aging. Anything else to keep an eye on?

Thanks for your hints in advance!!

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Don't get the poly mounts as the exhaust one will melt. You can change them without taking the engine out.

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Lotus Esprit [meaning] a 1:1 scale Airfix kit with a propensity to catch fire

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I have a stabiliser fitted and can’t recommend it enough, easy to manufacture and fit.

Engine mounts can be done in place, little tricky getting enough lift so make sure you slacken the gearbox mounts off and check the bushes as they tend to fail allowing the inner bushes to move within the rubber. I remove the whole mount assembly rather than just the rubber as find it easier to pre assemble then slide in but I’ve seen it done just removing part or even the mount only.
Easier to remove the complete air box to assist with space/access.

Enjoy and remember the new mounts don’t have the locating dowel if still on the originals.

Dave :) 

Do or do not, there is no try! 

 

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Thank you very much, Paul and Dave!

Very helpful info and glad to hear that he won't have to get the whole engine out. 
 

@Paul Coleman when you say I should not get the poly mounts - what is the alternative? I've always just seen  polymer mounts as spare parts. Was aware of the exhaust heat issue and was planning to install a heat shield.

 

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OEM type rubber mounts are best.  The heat in that area is intense.

 

I'll ask the S1/S2 guys: are Turbo style heat shields OK to fit?  I have dimensions if they say YES.

IMG_1840.JPG

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Atwell Haines

'88 Esprit

Succasunna, NJ USA

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  • 2 weeks later...

Hello Rohan,

Your advice is much appreciated in this and I'm pleased you've checked in once again with that update on your results. It's remarkable that such a simple and straightforward alternative wasn't pursued by others, particularly in light of the price demanded by vendors for the Turbo mount conversion. 

Best regards

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What a fantastic share, now this is definitely worth looking into and identifying a supplier with link to make it simple for all.

I will do this on my S1 as need to pull the engine anyway.

Dave :) 

Do or do not, there is no try! 

 

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  • 4 weeks later...

The ones i used were the "FAP" 90 kg rated ones on page 12 of the Motherson  catalogue at the following link.  They are a local Australian manufacturer / supplier located in Melbourne.  I don't know if they sell in the US or Europe / UK.  I tried the 180kg rated ones for added stiffness but engine NVH was significantly greater for no noticeable handling difference so went back to the 90Kg ones.  BTR was the original supplier I source from in Australia and this company broke up a number of years ago  Lotus used Silentbloc mounts for many of its cars so they must orginally be of UK origin.

httphttp://www.motherson.com.au/UserFiles/File/pdf/Silentbloc-Catalogue.pdf

Some very similar / identical mounts from another Melbourne company on page 46.

ww.industrialbearings.com.au/uploads/catalogs/industweb_1343015500.pdf

Looks like Silentbloc UK was taken over by Deliner in 2020 I dont know if they still make the same product.

https://www.dellner-brakes.com/dellner-brakes/silentbloc/

 

I have also attached my original write up from 1995!

 

cheers

Rohan

 

 

 

 

S1MOUNT.DOC

Edited by rgh0
added file attachement
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I made I similar research about thirteen years ago developing a new system for more efficient engine mounts, after a lot of work I have ended with a new system that was perfect for someone and not for other buyers, if I recall correctly Matt Watts and Pete also bought the kit but they were never able to fit correctly, don't ask me why as two other esprit S2 owners bought the kit and the fitting was just perfect.

Hope your development would be better than mine :thumbsup:

here the topic I've started in 2008

G.

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HI Giorgio

 

Your design looks nice and uses a similar mount to what Lotus used on the differential on the Elan so very much in the Lotus tradition.  We both approached it from looking at how to get the mounts with rubber in compression in all modes of engine movement which is a basic critical feature for a vibration mount and one that Lotus seems to have ignored in the S1 / S2 Esprit's 😠

Not sure why some would work and some not as I believe all the S1 and S2 cars used the same engine mounts and arms and geometry but perhaps Lotus made some model specific changes we are not aware of. 

 

cheers

Rohan

 

 

 

 

 

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Thanks for giving a bump to this thread, Rohan! Giorgio's program would have been far easier than the work I'm doing fabricating Turbo style adaptation to the S2. 

Giorgio, what is your situation in regard to licencing the Esprit? Over on an American hosted forum we are reading complaints from others in the Schengen on draconian regulations impairing enjoyment of older hobby cars, rising import taxes in Denmark and refusal to licence a '79 Corvette in Belgium due to non-original engine tune.

Cheers 

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At the end the Italian rules allow to register and drive the car in my country so no probs until now.. that said my car still needs some details to be finished so at the moment it’s a garage queen. Don’t know if I would keep it or not.

G. 

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