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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-20-2012, 07:59 PM   #1 (permalink)
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5TA/3TA Engine Vent

I am refurbishing a 1961 5TA Bathtub with the hope of riding it around town this summer. My question is where does the engine vent hose that is behind the drive sprocket go? To the air cleaner? The bike I am refurbishing had it blanked off and made vent stub on the primary oil fill port.

Hopefully the answer is not to route the connecting hose under the bike just in front of the rear tire? Should be fun in the rain!!

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Old 11-20-2012, 10:26 PM   #2 (permalink)
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On my '66, it tees off. One end of the 'T' goes to the oil tank, the other end was ran along the rear fender and is used to lubricate the chain. Mine is currently venting a lot of oil and not many fumes!! Some say you don't even need a hose as long as you lube the chain.


Hope this helps...
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Old 11-21-2012, 03:05 PM   #3 (permalink)
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You need to find out where the crankcase is actually breathing.It sounds like it has been changed.
For the breather on the chaincase to be working,the drive-side mainshaft seal would not be fitted.This is normal for '70 onward bikes;they use no seal and have 3 drain holes in the crankcase to drain any excess oil from the primary back into the crankcase.

Your original breather may or may not still work.If you still have the drilled camshaft and the disc valve and spring are fitted,you could go back to using it.You would need to test if the disc valve is in there and working.

If you use the early breather,you could either
1./ Leave the bearing seal still out and the drain holes still drilled,and just use engine oil in the chaincase.
2./ Fit the seal,plug the drain holes (if any),and use ATF in the chaincase instead of engine oil.
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Old 11-21-2012, 04:46 PM   #4 (permalink)
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Good point Mr. Pete. Based on my "discoveries" so far I would not be surprised to find the crankshaft seal still in place and no holes for oil transfer.

I will investigate Thanksgiving Day.
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