I am reassembling my A65 motor and was wondering which, if any case sealant is best. I have seen Three Bond stuff on the web, but not locally. Anyone with advice/knowledge who'd like to weigh in on the subject, I'd sure appreciate it. Thanks, Dave
Check the mating surfaces for burrs and make sure they are cleaned of oil and any schmootz. I've used Indian Head Gasket Shellac for case sealing for over 20 years without any problem. Put on a thin coat. You can get it at any auto parts store for about $1.50. Stay far away from silicone red, blue sealers on any surface anywhere near an internal engine component.
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Re: Case sealant? Yes/no- which one?#48406 07/29/0612:14 pm07/29/0612:14 pm
John is right. IMHO, 99% of engine sealing is in the prep work. I scrub my mating surfaces with fine Scotchbrite or other kitchen scouring pad and lacquer thinner. It's got to be flat, clean, and absolutely free of oil. Use lots of thinner and compressed air.
Given a choice, a light grey sealer will be invisible after the job is finished. A red or blue sealer sticks out like a sore thumb for years.
Don't hide 'em, Ride 'em !!
RF Whatley Cornelia, GA
"Shop Boy" at Rodi British Bikes
Re: Case sealant? Yes/no- which one?#48407 07/29/064:02 pm07/29/064:02 pm
Threebond is great but John RGS is correct, poor or dirty sealing surfaces are a recipe for failure. The case joint is the first one you put togeather and if that leaks you strip all the rest to go back there.
1969 TR6R 7.62 x 51 is not a maths puzzle.
Re: Case sealant? Yes/no- which one?#48412 08/03/062:24 am08/03/062:24 am
i use a product call mopar gasket maker,part number 4318083 its an anarobic sealer,works great never had an issue,use it sparingly, it little goes a long way,any dodge chryler jeep dealer should have it.i tube lasts for years.
Re: Case sealant? Yes/no- which one?#48413 08/03/064:20 am08/03/064:20 am
The secret to a good seal is to make sure that both halves of a casing are "Totally" flat. I actually used an engineers table and some engineers blue (a sort of paste) to flatten the crankcases on a B40. When I first put them on the table they actually wobbled?!!! This was down to burrs around the holes where the fasteners fit, and poor casting technique? The burrs can be removed using a large drill bit, and the procedure to flatten the cases takes alot of work, but is well worth it! If you get it right then all you need is a thin smear of "Hylomar". This stuff is available on the web, and endorsed by Rolls Royce. I have even seen a set of Goldstar crankcases that were so 'true' after re-work that they only required a smear of vaseline to seal!! Food for thought?!!
Re: Case sealant? Yes/no- which one?#48414 08/03/0612:43 pm08/03/0612:43 pm
OK, may as well add another idea.... Try the clear silicone adhesive sealant (like aquarium sealant). It resists oil, and won't show as it is clear. Yes it will be a bit harder to get the cases apart next time, but not that bad....