Monty Crankcase Copper Washers Position
- Thread starter Gbarnes3
- Start date
piranha-bro2
Hero member
- Location
- Melbourne
Not seeing any replies, I'll try and help (but have no direct experience of the smaller twins). The copper washers will fit somewhere where oil is able to enter a stud or bolt eg a stud passage that doubles as an oil supply. Determining that would be a lot easier on a motor in bits.
Maybe a genuine 'cogninscento' will turn up who can give you a much better answer.
Maybe a genuine 'cogninscento' will turn up who can give you a much better answer.
Robin Webster
Hero member
- Location
- Silverstone
It?s been a while but the grey mists say that under the sump are two long brass closed nuts. The copper washers go behind those as far as I remember.
Robin
Robin
Linda's 1977 Alpino *12--* has no copper washers on crankcase bolts/studs. They are all steel.
This bike has less than 2,000 miles from new on it and only 8 fasteners show any signs of a spanner being applied, and they were on the carbies.
The two larger studs with washers and a closed nut on the top, rear of the crankcases have steel washers.
The only copper washers I found are under the socket head screws on the cam cover, and four on the socket head screws holding the plastic cover over the starter motor.
Parts diagram and list does not call any up either.
this is not to say that later series bikes did not have a copper washer on M8 studs, but the early, pre-balance shaft bikes didn't - at least ours doesn't.
you may find your bike has had them added to cure a leak. As has been stated previously, copper washers and blind head nuts have been used on both twins and triples where oil migrates along the stud.
Hope this helps
This bike has less than 2,000 miles from new on it and only 8 fasteners show any signs of a spanner being applied, and they were on the carbies.
The two larger studs with washers and a closed nut on the top, rear of the crankcases have steel washers.
The only copper washers I found are under the socket head screws on the cam cover, and four on the socket head screws holding the plastic cover over the starter motor.
Parts diagram and list does not call any up either.
this is not to say that later series bikes did not have a copper washer on M8 studs, but the early, pre-balance shaft bikes didn't - at least ours doesn't.
you may find your bike has had them added to cure a leak. As has been stated previously, copper washers and blind head nuts have been used on both twins and triples where oil migrates along the stud.
Hope this helps
Fitz
Senior member
- Location
- Cheshire UK
Never seen any copper washers on any of my engines, i've just rebuilt mine for this season