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glynherron

Crankshaft shells - advice needed...

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Hi Guys again.....

Below are some pics of the shells from the mains and big ends.

What are the shells made from (metals and colours?)

How do I tell what size they are?

Please add comments from what you see and what further I need to check

Cheers

Big end shells (con rod side)

2011-06-20%25252019.57.48.jpg

2011-06-20%25252019.57.41.jpg

2011-06-20%25252019.57.35.jpg

2011-06-20%25252019.57.28.jpg

Main shells

2011-06-20%25252019.57.09.jpg

2011-06-20%25252019.57.03.jpg

2011-06-20%25252019.56.51.jpg

2011-06-20%25252019.56.57.jpg

2011-06-20%25252019.56.43.jpg

2011-06-20%25252019.53.49.jpg

2011-06-20%25252019.56.06.jpg

2011-06-20%25252019.54.43.jpg

2011-06-20%25252019.54.36.jpg

2011-06-20%25252019.54.22.jpg

2011-06-20%25252019.54.16.jpg

2011-06-20%25252019.54.08.jpg

Shell markings

2011-06-20%25252020.07.03.jpg

2011-06-20%25252020.08.15.jpg

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big ends and mains need replacing, the shells you have shown appear to be standard size. If they were undersize internally (crank gets ground therefore they're not technically over size) you'd see markings to that effect on the outer faces of the shells. Yoy can also get over-size which are enlarged externally (block needed enlarging to get it in line / remove damage).

The shells are gone, but far frm the worst I've seen, worth inspecting crank for visible damage (don't expect there to be any from those shells) and wear (if that's the original shells then again I don't expect it to have issues) but it may be worth running it to an engine shop to have it measured and possibly the journals polished (if they recommend it).

Also check end-float which is controlled by the thrust washers pictured in the fifth image. Hard to see if they are OK fom that angle.

Andy

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Looks like your filters have done a good job over the years which is heartening.

Check the shell backs too for witness marks of movement. If there is then the bearing crush specs need to be checked. If they're like your last photo it should be ok.


DanR

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As a matter of interest, can you tell us what oil you have been using?


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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Just out of interest, why do you not have a grooved main shell in the middle upper? Did they fit just fit a plain lower instead?.....


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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I've had this esprit for almost 3 years but not been used for a long while. I don't know its history for the previous oil, but I use the lotus recommended, from opie oils, but I can't remember the name of it, or the spec!

So in my list of parts I'm going to order standard mains and big ends. Should I buy from lotus or from for example mr kemp etc? Genuine our not?

Thanks for you continued support and interest

Glyn

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Just out of interest, why do you not have a grooved main shell in the middle upper? Did they fit just fit a plain lower instead?.....

Can't recall if #3 main feeds the big ends or their supply is from the other mains. Need to check the oil passages to confirm.


DanR

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Dan is correct. The groove is the feed for big end oil via the drilling in the crank. A 4 cylinder engine with a 5 bearing crank only requires 4 grooves to feed 4 big ends. As an aside, a cross drilled crank (2 oil holes) then uses a pairing of one plain and 1 grooved to increase the bearing area. If the crank is not cross drilled (1 oil hole) then the groove must exist in each side of the pair, reducing bearing area.

Edited by 910Esprit

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quite nice wear really !the end float needs a looksy,as said already, and the contact area at the end of <crankshaft too end float shim> this is a area of concern look for excessive wear there also<on the crankshaft itself> . :sofa:

pics of crankshaft :detective:

Edited by mc21.8

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In aswer to what they are made from they are copper covered in white metal usually.

The white metal is a very soft alloy that will wear into the crank rapidly and catch hard particles before they damage the crank.


Lotus Esprit S4 - Work in progress

Porsche 924 Turbo - Parts chaser

Smart Roadster Coupe - Hers

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I have heard from Garry Kemp that the original bearings were a high quality Lead/Bronze material made by Vandervell – their VP2 material which is a race quality bearing.

These are no longer available so an alternative ACL bearing which is of Aluminium / Tin construction is being supplied.

Does anyone know of anywhere where I can buy the high quality shells from..

Cheers

Glyn

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If Gary hasn't got them there is a fair chance they are not available, I think most of the UK non-genuie suppliers will be using/ supplying the ali/tin ones. You could try dropping Mike Taylor a mail or call, he may know of somewhere he caould get some if they are still made.

Lotus still do genuine shells, are they not original spec materials?

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