CC002 POST-WAR OIL LEAKS/CHAINCASE

What is the correct length for the "Inner" Chaincase distance piece (i.e. F310 - The item which fits directly onto the fixing bolt)? - Alan Stevenson 27/10/2000.

(Earlier discussion of the spacer tube that keeps the two halves of the primary chaincase apart follows:
Velocette overall list:
FK205 Distance tube inside chaincase Venom etc (and presumably a very early model - which?)
FK205/2 Distance tube inside chaincase MOV, MAC, GTP
FK205/3 Distance tube behind chaincase KSS 1932-5
Anyone know the formal dimensions of both F310 and the FK205 family? - TW 28/10/2000)

According to the parts books the FK205 series were first used on the 32-35 cammys.
FK205 is used on the rigid MSS/Mk2 KSS/KTS as it is basically the same chaincase as used on Venom etc.
The length is 1.125 inches.
FK205/2 is used on the rigid MOV/MAC/GTP and is the same length but the internal diameter is smaller. I make mine to 22mm which seems to work FK310 ( I believe I have an original one) is 11/16 inches - eleven sixteenths. I do not have an example of FK205/3. We need to look at someone's Mk 1 cammy. We could also do with a comprehensive list of the SL60 series, which are mainly footrest spacers used on the rigid models. I will try to compile one when I have some spare time. - Roger & Jane Franklin 4/12/2000

FK205 is 1.125 inches long, 1.250 inches outside diameter and 1.125 inches inside diameter. I make my own up using aluminium with two "O" rings to seal against the lips of the chain case inspection hole. I make the inner spacer as an integral part of the device. It appears to do a great job of helping keep the oil in the pcc.
Incidentally I hade a problem sealing the inspection cover cap, the cork insert was useless and it didn't mater what I did, it would always leak. The solution that finally worked was to punch out a 1 inch disc of neoprene 2 to 3 millimetres thick and use this. - Dai Gibbison 14/12/2000.

I read somewhere a long time ago that if you melt some tallow & pour it into the chain case before adding the oil that would seal it. It seems logical to me. The ends of the case will be sealed easily by the pressure of the band, the top run doesn't really need much sealing & the molten tallow would run into the seal at the bottom before setting. Doesn't matter if the chain touches it because any surplus would get dispersed in the chain case oil. I've not tried this method myself mind because I can usually get a reasonable seal by careful assembly similar to that described in CC006. - Bill Couzens| 10/8/2006