1966 500 Crankcase Breather Questions?? - Triumph Forum: Triumph Rat Motorcycle Forums
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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-10-2012, 10:23 AM   #1 (permalink)
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1966 500 Crankcase Breather Questions??

I hooked my breather pipe up to the crankcase nipple under the engine by the forward sprocket. Tough lil bugger, anyway. I ordered the breather 'T' from ebay. My question is where exactly does that 'T' fit, and how much oil should be exiting the motor via this breather?

I hooked the line up straight to the top of the oil tank without the 'T' so I can start to tune it. I checked the oil tank after starting and a pretty good stream of oil is now returning via this breather. Have I done something wrong?? Have I added to much oil?? Do I have a leaky seal someplace?? The manual is not a lot of help on this matter?? Can someone help me understand what is going on here?? Is it safe to run?? That's the important question.

One more thing, I might have a leaky petcock on left side. Changing both petcocks and the oil before I proceed any further!!!

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Old 11-10-2012, 05:38 PM   #2 (permalink)
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You've now got the return pump pumping oil+crankcase fumes back into the oil tank,and the breather hose pumping crankcase fumes into the oil tank.Where do those fumes escape from the oil tank?
A few drops of oil per mile or per minute coming out the breather hose wouldn't be a big concern.It sounds like you have a lot more than that,so there is likely to be too much oil in the crankcase.

The return pump should take care of that after you've run the engine a few minutes.All that extra oil should return to the tank,and the tank level will rise.See if you're getting good oil return to the tank.If the oil level is dropping when you run the engine,you definitely have a problem with the return pump.The return pump should eventually pump back air as well as oil to the tank.You should be seeing air bubbles in the return oil.

Then oil should stop pumping out the breather hose.

The Y-piece runs across the frame in front of the battery,with the smaller diameter leg on top,facing back toward the oil tank and connecting to the oil tank breather.You can join the crankcase breather to the larger leg beneath it.

Then just run another hose off the remaining leg of the Y-piece.You can run that down to the ground or out along the primary side of the rear mudguard.
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Old 11-11-2012, 12:08 AM   #3 (permalink)
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Thx Mr. Pete

You have been a great help. I am just so worried about damaging it before I get to play with it a bit. Just being cautious. Say it runs for a bit.....and the oil keeps flooding the crankcase, out the breather??? Where do I go from there?? Is that rare?? I have not ran the bike more than 10 minutes at a time, for 3 times. When it runs, it sounds great!! Some more tuning of the carb, rebuild kit etc... and it sounds as if
is roadworthy. It's just that oil keeps pumping out the breather exit and into the tank. I am afraid to hook up the breather just yet???
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Old 11-11-2012, 05:46 AM   #4 (permalink)
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you shouldnt need a tube on the breater, no oil should come out only a mist now and then. you need to take the big plug out of the bottom of the crank case and drain the oil in case it as "sumped".once this is done no oil should come out of the breather if you look in the oil tank you should see oil pumping in to it, if you dont then you need to remove the oil pump, if it is pumping oil and it coming out of the breather then you need to take the inlet cam out and check the timed breather, there are two types for that year make sure you have the right one.
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Old 11-11-2012, 06:28 PM   #5 (permalink)
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If it doesn't come good,you should drain the crankcase;like 1963 wak says.
There may be 2 pints of oil in there,instead of less than 1/4 pint.

You can sometimes clear the oil return pump by blowing compressed air up the pickup tube and blowing the rubbish out of the pump and out the return line.The engine needs to be at the correct position to blow through the pump.Take off the return line at the tank,so rubbish doesn't go to the tank.

Put 100 ml of oil back into the engine through a rockerbox,to prime the crankcase.
It should pump out the return line when you start up.Then re-fit the return line.
If it still doesn't work,you need to look inside the pump.

You should be able to blow through the breather hose into the crankcase,when the pistons are at BDC.The valve should be closed at TDC,and you can't blow air through.
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