crankcase sealant

maccas · Post by **maccas** » Tue Jul 20, 2010 11:40 am

hi everyone, i built my kr1 engine back up a couple of months ago to find that the granville clear silicone gasket sealant i had used as soon as it came in contact with petrol went all stringy and came away from the joints

so the engine is now back in bits ready for another go, this time i have bought some permatex ultra grey ( nearly £8 a tube) after seeing that it is recommended on the pj engineering website, however after reading the back of the tube it says not recommended for cases in contact with petrol, so i'm guessing this will be no good once again? or has anyone used ultra grey with success?

if it is no good what do you guys use that is easily available?

cheers, maccas

Yatsushiro · Post by **Yatsushiro** » Tue Jul 20, 2010 1:06 pm

This is all you need:

http://cgi.ebay.co.uk/Threebond-1194-11 ... 1726wt_911

I'm sure that there are others, but I've used them in my TDR race engines for 3 years now, no issues at all.

maccas · Post by **maccas** » Tue Jul 20, 2010 1:14 pm

thanks very much, i will get some ordered

maccas

smithyrc30 · Post by **smithyrc30** » Wed Jul 21, 2010 4:00 am

These are silicone based sealants.

They will go hard and leave stringy bits.

I prefer the anaerobic sealers like the 3bond 1103 or loctite 515 or 518 sealers.

They do mo go hard until you exclude the air, so when you bolt up the cases they seal and the excess that squeezes out just gets washed away into either the gearbox oil or out the ports. The loctite stuff will do gaps up to about 1mm so if you have gouged or damaged cases it will seal that as well. The 3 bond is a little bit thinner and will only do about 0.5mm, but you do use less as it comes out the tube easier.

Never ever had a leak with them.