Hitchcocks Forum

Morning All.just stripped primary inner and outer to renew oil seals and my query is regarding the crankshaft breather bolt which is fitted with a brass bush with a metal disc.I have dismantled this assembly and cleaned and re assembled it but I can blow through the bolt, but I can also suck, surely the logic behind the metal disc is to provide a one way flow, which it isn't. Should I replace the assembly? Thanks all. (Mark!!)

metal disc

Blank it off. That's what I have done on my Connie

I believe our hosts do a replacement bolt without the breather!

That's what I had on my 59..

Tom

Thanks guys, but my concern then is where is the crankcase pressure to go without a working breather.?

you need all the breathing you can get, if your existing unit is faulty?, replace it.

Hi, early connies/super meteors do not have the breather bolt but a plain stud to hold the alternator rotor, look at the parts list. The change over seems to be 59/60. Vince

As Dezzy as asked,how do the the later models breath,RE obviously found the previous 58-'59 breather not up to the job
so went to the crankshaft breather,(fitted to the '50-'51 500 twin) so he can't simply close that off without an alternative
breather.By the way you can blow and suck through a duck bill,and you can do the same with my 500 twin breather as the 10 thou
thick disc has a hole in the center.
http://accessories.hitchcocksmotorcycle ... ather+bolt

The early ones without the crankshaft breather used the breather on the top of the crankcase the later twins have a slot cut into the crankcase faces joining the crankcase to the oil tank, the breather then is fed to a union in the oil tank top Enfield stated that this was no longer a breather it was simply an oil drain. The crankcase breather is needed on the later bikes.

That should be crankshaft breather is needed.