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SP250 Engine oil seals; cork or rubber?

wadams
Posts: 22
Joined: Wed Feb 01, 2017 4:07 pm
Location: Pontypridd

SP250 Engine oil seals; cork or rubber?

Post by wadams » Fri Mar 15, 2019 8:55 am

Hi
Does anyone have experience of using engine oil seals made of rubber instead of cork for the SP250 please?
Thanks

timmartin
Posts: 33
Joined: Wed Feb 17, 2016 1:37 pm
Location: Berkshire

Re: SP250 Engine oil seals; cork or rubber?

Post by timmartin » Fri Mar 15, 2019 9:32 am

I am assuming that you are referring to sump oil seals.

I do not have the personal experience to comment, but Russ Carpenter (who is currently rebuilding my engine) told me as recently as this week that he now prefers cork as it reacts to the oil better over the long term.

I have been told by both him and Philip Glenerster (spelling?) that it is easier than you might think to snap the sump when bolting it back on. Not something that I would have guessed, but might be irritating.
Tim
Blue 1964 SP250 in Berkshire

Big Col
Posts: 338
Joined: Tue Feb 16, 2016 12:45 pm
Location: Leeds

Re: SP250 Engine oil seals; cork or rubber?

Post by Big Col » Fri Mar 15, 2019 10:36 am

Cutting to the correct length is the trick and can be a trial and error operation.
As they compress radially to seal they expand laterally thus causing difficulties to get the length right. If too long then the sump does not pull up to the block face and can crack the sump if too much torque is applied to the retaining screws. If it is too short then gaps appear at the ends although they can be bodged with sealant.
Rubber can be difficult to push into position as it is a tight fit but a little grease can help. Cork should not be greased or oiled prior to installation as it will expand unevenly and swelling will make it difficult to fit.
Over time rubber may shrink but in saying that it is a consumable item that has a life span. Cork will shrink if it is not kept damp over long periods. All types of seals on all types of engines will never last for ever.
Colin,
I may be slow but I’m rough as well !

wadams
Posts: 22
Joined: Wed Feb 01, 2017 4:07 pm
Location: Pontypridd

Re: SP250 Engine oil seals; cork or rubber?

Post by wadams » Fri Mar 15, 2019 11:27 am

Thanks for the great info on the seals guys, it is certainly really helpful.

wadams
Posts: 22
Joined: Wed Feb 01, 2017 4:07 pm
Location: Pontypridd

Re: SP250 Engine oil seals; cork or rubber?

Post by wadams » Fri Mar 15, 2019 5:04 pm

One more question, can the seals be replaced with the engine insitu if you have the car on a ramp?
Cheers

Big Col
Posts: 338
Joined: Tue Feb 16, 2016 12:45 pm
Location: Leeds

Re: SP250 Engine oil seals; cork or rubber?

Post by Big Col » Fri Mar 15, 2019 6:04 pm

I have done it but it is not straight forward. The sump (my brother referred to it as the “camels ump”) catches on the chassis and back plate so the engine has to be lifted until the top of the bell housing touches gearbox tunnel. The engine internals stop you getting a good angle to manipulate the sump out. If memory serves me accurately a little metal removal was required as well.
Colin,
I may be slow but I’m rough as well !

Reedweaver
Posts: 25
Joined: Sun Feb 21, 2016 2:20 pm

Re: SP250 Engine oil seals; cork or rubber?

Post by Reedweaver » Sun Mar 17, 2019 3:49 pm

My SP sump came off with little trouble using adjustable ramps. I dropped both exhaust manifolds off at the same time as one was cracked. The starter was removed as well and replaced.

I couldnt believe the amount of sludge caught in the sump trap! The cork seals were leaking badly, but they were 25 years old!

I am going with rubber seals this time.
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wadams
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Joined: Wed Feb 01, 2017 4:07 pm
Location: Pontypridd

Re: SP250 Engine oil seals; cork or rubber?

Post by wadams » Sun Mar 17, 2019 10:45 pm

Hi Reedweaver
Thank you for your comments and pictures. Much appreciated.

Reedweaver
Posts: 25
Joined: Sun Feb 21, 2016 2:20 pm

Re: SP250 Engine oil seals; cork or rubber?

Post by Reedweaver » Mon Mar 18, 2019 11:03 am

You might as well drop the oil pump as well while you are at it. Mind you, not much goes wrong with it I am told. It throws a fair amount of oil around and needs little maintenance. Andrew from Carpenter Racing can refurb and rebiuld to exceed OEM spec but it wont cure low oil pressure due to bearing wear or other issues.

A few more pics...
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John-B
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Re: SP250 Engine oil seals; cork or rubber?

Post by John-B » Mon Mar 18, 2019 11:21 am

Reedweaver wrote:
Sun Mar 17, 2019 3:49 pm
I couldnt believe the amount of sludge caught in the sump trap!
I'd rather not look at mine. Are flushing oils any good at getting rid of sludge there?

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