Author Topic: Shellac for Sealing Crankcase  (Read 819 times)

Offline NickSR

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Shellac for Sealing Crankcase
« on: 19.01. 2012 19:48 »
Hi Everyone

Sorry not BSA related, my friend is having problems with a Royal Enfield crankcase someone has suggested painting the inside of the crankcase with shellac to seal them?

Any advice would be great.

Regards
Nick
1962 Super Rocket
1955 BSA C11G
1998 BMW R850R

Online bsa-bill

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Re: Shellac for Sealing Crankcase
« Reply #1 on: 19.01. 2012 21:07 »
Is shellac stable in an oil rich environment, I visualise it peeling off and gumming up gauzes  and oilways
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online trevinoz

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Re: Shellac for Sealing Crankcase
« Reply #2 on: 19.01. 2012 21:48 »
Nick,
             There is a product here known as "crankcase paint".
I know one bloke who uses it in his oil tanks with no problems.
I have seen it used in hydraulic system tanks, also.
Is the oil actually seeping through the aluminium casting or the joints?
I have built several RE single engines and the crankcase joint MUST be sealed with a high quality sealer or oil will seep out of the bolt holes around the actual crank section from the oil tank section.

  Trev.

Offline NickSR

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Re: Shellac for Sealing Crankcase
« Reply #3 on: 19.01. 2012 23:04 »
Hi Bill & Trev
                 Problem with 1960 Bullit big end bearing only done 10,000 miles by a very well know company in the UK, they have suggest alumimin particales my have caused the wear.

They also have suggested sealing inside the crankcases with shellac?  there is gasket shellac on Ebay UK ?.

To fair to the company they have reduced the cost of the repair by a fair bit.

Again thank you for your advice.

Regards
Nick.
1962 Super Rocket
1955 BSA C11G
1998 BMW R850R

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Re: Shellac for Sealing Crankcase
« Reply #4 on: 20.01. 2012 21:50 »
Nick,
            The question is, where is the aluminium coming from?
Doesn't seem logical that it is from the cases but more likely the con rod or the oil pump housings.

  Trev.

Offline NickSR

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Re: Shellac for Sealing Crankcase
« Reply #5 on: 20.01. 2012 22:22 »
Hi Trev
Thanks for your comments, I agree with you its coming from another sourse.

Regards
Nick
1962 Super Rocket
1955 BSA C11G
1998 BMW R850R