SOHC.co.uk Forums > CB750

Oil Filter thread size

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hairygit:
That said, I take it that the thread in the crankcase is dodgy if you're looking for a tap, do it properly with a Wurth insert, damaged threads in alloy will not hold for long!

philward:
I agree Hairy - and doing an insert on a thread that size with hand tools may not be that accurate - probably need a machine shop to carry out that job?

hairygit:

--- Quote from: philward on April 06, 2017, 07:22:18 PM ---I agree Hairy - and doing an insert on a thread that size with hand tools may not be that accurate - probably need a machine shop to carry out that job?

--- End quote ---
  To be 100% safe about it, yes, a good engineering firm will be needed.

Tomb:
If it helps find a tap, electrical conduit size is M20 x 1.5

captaink:
Thanks for the replies.
Got an M20 x 1.25 to clear the thread.
The thread wasn't damaged but the process of aqua cleaning it, it needed clearing and as I did all the 6mm threads in the casing it was worth doing this one as well.
Because most of the threads had bolts put in some 40 years ago they should be ok but the oil filter has most likely been apart a few times , so could suffer from wear.
If it was worn I would most likely have fitted a spin on oil filter adaptor as supplied by Cycle X. which would eliminate the need to remove the adaptor fitting from the casing.
I may even fit one anyway, but not sure !

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