General Category > General Discussion
Over pressurized crankcase Cal III
bigbikerrick:
My 76 Convert puked oil a couple of times out of the breather, I was able to resolve it by adding a sump spacer,and installing the breather cannister meant for a loop frame bike, with the newer style ball valve on top of the crankcase. The stock airbox/breather setup, was hard to service,and a poor design IMHO.
Rick.
Vecchio Lupo:
Well, my frame box seems to flow fine, none of the hoses are blocked, the ball valve looks ok and I can blow through one way but not the other, so that seems right. I took some photos just now and I saw where my distributor has shifted a bit. I can’t imagine that affects crankcase pressure. What do you boys think? ?
Vecchio Lupo:
--- Quote from: bigbikerrick on February 07, 2025, 08:57:21 AM ---My 76 Convert puked oil a couple of times out of the breather, I was able to resolve it by adding a sump spacer,and installing the breather cannister meant for a loop frame bike, with the newer style ball valve on top of the crankcase. The stock airbox/breather setup, was hard to service,and a poor design IMHO.
Rick.
--- End quote ---
Shout out to BigBikeRick for all his great advice and help with my Convert Police bike. She turned out great. Im disappointed that the Meltdown European Motorcycle Show in N C is canceled this year. I figured I had a good shot at best Italian.
pehayes:
--- Quote from: Vecchio Lupo on February 07, 2025, 01:11:05 PM ---I took some photos just now and I saw where my distributor has shifted a bit. I can’t imagine that affects crankcase pressure. What do you boys think?
--- End quote ---
Please explain that "...shifted a bit."
A distributor clamp is supposed to be adjustable. You may have to rotate the distributor one way or the other every time you tamper with or replace the ignition points.
Have you checked the static and dynamic timing recently?
If your ignition timing is way off you could be igniting the mixture long before the piston reaches TDC. If so, I would suspect that combustion chamber pressure is going to be higher than normal and could blow into the crank chamber.
Patrick Hayes
Fremont CA
Vecchio Lupo:
Well I noticed the retaining clamp was loose on one side (the slotted side) and was off the bolt. The other side was tight but the distributor could have moved. Previous owner installed DYNA electronic ignition, so points gone. I will check that next.. thanks for the help
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