rebuilding engine crank cases

[Peirre]

when re-joining crankcases together would you use a fancy gasket compound, cheapo silicon or other to make the joint??
and would you use copperslip on the crankcase bolt threads to stop them siezing in later on

[iain]

i use stuff called wellseal,which i have had for years.got it from les williams in kenilworth(triumph guru)never use silicon on anything but baths,it spews out of joints and forms lovely little balls which block oilways and it looks naff in bright colours.copperslip is good stuff,good for high temp work.dont use black grease as it hardens up with heat.

[ForestFred]

I can vouch for copperslip in high temps .We use it at work to lubricate rollers .that form parralell tubes in to taper tubes for street lights using elctor magnetic heat induction( plays havoc wiv anyone who has a pacemaker fitted)

[smeghead]

i use three bond on crankcases,the grey one good stuff

[Big Pete]

Mornin POB, I use normal clear gasket silicon usualy,but be sparing with it. I also have some anearobic stuff that I use when there is a risk of getting in it oilways, but I don`t know where you would buy it outside of a specialist bearing/seal place.

[trykerdon]

i usually use HYLAMER i think thats how you spell it it is certified for use on rolls royce cars and i have used it for more than ten years although i still cant spell the bloddy stuff but any compound you chose should be put on very thinly just till the cases have a very thin blue line covering them and it is always sensible to wipe the insde 1mm of the casing clean to allow for the compression fit when bolted togetherso the comp doesnt get inside the other thing to look for is on most boxes of goo it will say suitable for all oils etc but read it closely it also says not suitable for continuous contact with petrol etc hope this is helpful

[Peirre]

thanx for the info, the cases are now back together and the engine has just been put back in the frame, all that is left to do is put the oil in the engine, put some paint on the rusty bitz of the exhaust that sits under the engine. and fire it up.


though I`ll still have to source a spare alternator for the CB900f to get that running right :rolleyes: looks like I`ll be rummaging around the autojumble at newark showground this weekend 23rd- 24th oct