Coffee talk dumb question of the day - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 57 (permalink) Old 07-13-2019, 11:39 AM Thread Starter
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Coffee talk dumb question of the day

Ok here I go again... stock, rebuilt,4000miles on the clock 68 Bonneville. Can’t get primary to seal. Did the glass method to flatten, thick gasket... thin gasket. Doesn’t drip a drop, ride it and it leaks like a Harley Davidson. Could it be pressuring up ? If so how and why... thoughts ? Let me know what other details you need to start forming theory’s.

Steven
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post #2 of 57 (permalink) Old 07-13-2019, 11:48 AM
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How much oil in the primary?
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post #3 of 57 (permalink) Old 07-13-2019, 12:02 PM
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Sounds like your crankcase breather is dripping. Is the engine wet sumping? If it's not wet sumping then I have no idea what the heck is wrong. Did you replace the oil pump during the rebuild?
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post #4 of 57 (permalink) Old 07-13-2019, 12:05 PM Thread Starter
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Correct amount with fill plug and tried with the old “it takes a little below the inspection plate” method. But drains to the point over time that clutch malfunctions. ATF and 30w does the same
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post #5 of 57 (permalink) Old 07-13-2019, 12:07 PM Thread Starter
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Breather on a 68 T120R Codeman ? Where is that located
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post #6 of 57 (permalink) Old 07-13-2019, 12:11 PM Thread Starter
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Oh codeman it does puke a little occasionally out the oil tank breather deal under the fender... sorry to use all these technical terms on you.

Steven
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post #7 of 57 (permalink) Old 07-13-2019, 12:13 PM
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has it leaked since the engine rebuild or has it just started ?
Exactly where is the leak ? one localised spot or over a wide stretch of gasket ? ---- you have flattenend the cover - but is the crankcase face clear / without nicks ? - how are you fitting the gasket -- clean / greased / with additional sealant

if i remember right the 68 breather pipe comes out the crankcases by the engine sprocker then a rubber pipe attatches - is that breather clear
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post #8 of 57 (permalink) Old 07-13-2019, 12:15 PM
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If you are using ATF, the leak will be red. If brown, it might be the breather, located under the engine in front of the drive gear. Hard to see, might have a hose attached to it. If the oil stinks, might be gear oil.
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post #9 of 57 (permalink) Old 07-13-2019, 12:22 PM Thread Starter
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Oh it’s no question it’s the primary oil leaking from gasket joint on lower side. Assembled dry,one gasket, then thick gasket, then Honda-Bond ( only brand I could find locally) fender breather deal is foamy yellowish/white

Steven
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post #10 of 57 (permalink) Old 07-13-2019, 12:41 PM
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There is a good article on the GABMA web site technical articles by Richard Watley on primary leaks. It might be worth a read.
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