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The engine crankcase is under slight pressure, vapour from fuel contamination can build inside the cap, which is full of sparks as they jump between the contacts, and of course the vents help with condensation.
Regards
Dave
I'm sorry, maybe you can elaborate. How does any pressure in the crankcase affect the interior of the distributor? They're completely independant of each other. A gear at the bottom of the distributor shaft is turned when assy is installed in engine block. Shaft turns the workings inside the distributor.The engine crankcase is under slight pressure, vapour from fuel contamination can build inside the cap, which is full of sparks as they jump between the contacts, and of course the vents help with condensation.
Regards
Dave
Try viewing this thread for some other info. Stock set up should be fine, unless you're needing to seal it because of water intrusion from deep submersions or other water source. You can't seal distributor completely due to corrosion from condensation, so a vent system is needed. Usually connected to sealed air cleaner system with snorkel to allow it to breath.Dumb question - Why does the distributor need a breather? Did it not come with one from the factory?
Bloody hell! Just seen how old this thread is.
Anyway found these:
Distributor fire - Jaguar Forums - Jaguar Enthusiasts Forum
My distributor cap exploded!!! - Pelican Parts Forums
Cap must be vented regardless if its to remove condensation or flammable fumes
Regards
Dave