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

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Old 04-19-2009, 09:26 AM   #1 (permalink)
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Cloudy oil coming from breather tube???

I posted a question the other day about engine ventelation and have not received any responses. I have a 69 T100R. I have just rebuilt the engine, and it's running pretty good.
There is a cloudy oily substance coming out of the breather tube, someone told me that's not unusual for the pre-primary case vented bikes and you can do some things to help reduce it by re-routing the breather tube. I'm just curious if anyone has had this problem and a fix for it?
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Old 04-19-2009, 09:38 AM   #2 (permalink)
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Quote:
Originally Posted by 10drum View Post
I posted a question the other day about engine ventelation and have not received any responses. I have a 69 T100R. I have just rebuilt the engine, and it's running pretty good.
There is a cloudy oily substance coming out of the breather tube, someone told me that's not unusual for the pre-primary case vented bikes and you can do some things to help reduce it by re-routing the breather tube. I'm just curious if anyone has had this problem and a fix for it?
10drum,

Are you talking out a oil misting out of the vent system?
How long has it been since the rebuild?
Have you run it long enough of the rings to seat?

If the rings have not bedded in as of yet you will have more
blow by, and would cause this problem. I would do a normal
break in and then decide if there is a problem.

Pookybear
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Old 04-19-2009, 12:54 PM   #3 (permalink)
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Thanks for the reply.

Actually it is milky white drip of an oily substance out of the engine vent system when it's running. I'm sure it is condensation and an engine oil mixture. I have the vent from the engine vent tube next to the main sprocket to a T with the oil tank and a discharge tube to just below the frame between the frame and swing arm.

I have only 30 miles on the rebuild. This is my first motorcycle rebuild (I'm an old car guy). I'm sure I need more break in miles, but I'm wondering if I have the vent tubes routed correctly.

Thanks again for the reply.
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Old 04-19-2009, 01:03 PM   #4 (permalink)
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It's the oil tank froth. I'm currently trying to figure out what to do about it on mine. I might employ a catch can ...
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Old 04-19-2009, 03:24 PM   #5 (permalink)
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Quote:
Originally Posted by 10drum View Post
Thanks for the reply.

Actually it is milky white drip of an oily substance out of the engine vent system when it's running. I'm sure it is condensation and an engine oil mixture. I have the vent from the engine vent tube next to the main sprocket to a T with the oil tank and a discharge tube to just below the frame between the frame and swing arm.

Thanks again for the reply.
10drum,

Ah yes got the picture now, I do not about hose routing. But
yes milky white is water and oil mixture. It happens when the
engine is run and warm up, boiling out the water. Then when
the engine cools again it condenses the moisture in the air.

I have a condensor tank on my breathing system. Really just
a 1 1/4 inch diameter pipe six inch long with an endcap on each end.
Two 3/8 inch fittings and two choreboys stuffed inside. I just
have my vent going into one end of the pipe half way up and
the other end at the top, going to a filter. Every three days of
riding I get a few tablespoons of clear clean water out of this
thing. That is all moisture I have kept from going into my
crankcase. it also collects that little bit of oil vapor from blowby
at higher rpms as well.

Pookybear
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Old 04-19-2009, 09:18 PM   #6 (permalink)
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Well, there you go pookybear, You do know what I'm talking about.

You just built a moisture trap. Where do you install this trap? Next to the vertical frame rail?

I did re-route my breather tube from the crankcase straight up (bypassed the oil tank) and out by the rear fender. I drove it about 10 miles and no drips of cloudy goo. When the engine cooled I pulled the tube off and drained the moisture/oil (goo), so a moisture trap could work. I think you are probably right about the rings needing to seat. The bike is running better & better the more I ride it.

It's difficult for me to grasp an understanding of how the crankcase breather works. The vent valve rotates on the end of the intake cam shaft. I see how it vents out through the vent in the bottom of the engine but I don't see where it draws from (you know suction).

Well thanks for you help. I'm gonna keep expirementing.
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Old 04-19-2009, 09:59 PM   #7 (permalink)
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Quote:
Originally Posted by 10drum View Post
Well, there you go pookybear, You do know what I'm talking about.

You just built a moisture trap. Where do you install this trap? Next to the vertical frame rail?

It's difficult for me to grasp an understanding of how the crankcase breather works. The vent valve rotates on the end of the intake cam shaft. I see how it vents out through the vent in the bottom of the engine but I don't see where it draws from (you know suction).

Well thanks for you help. I'm gonna keep expirementing.
Hey 10drum,

I original had my moisture trap right up the one side of the
vertical frame rail just like you were thinking. However, I do
have a later bike and just got the air boxes and relocated
my trap under the carburators. Not the best setup, does not
hold as much water before it is draining time. Anyway, just
attach the vent from the crankcase to the fitting in the middle
of the condensor and then attach the vent to the rear of the
bike to the top of the condensor. Simple, cheap, and it works,
though not to pretty. I have been thinking maybe getting
something turned out at the machine shop, but you know
how that goes, I got it working so....

I came up with this little number because I was riding my bike
all winter here in NC. The morning could be 16 degrees F. and
the afternoon could swing up to 50 degrees F. my crankcase
became the moisture trap and would puke out all kinds of stuff.
The condensor put a stop to all of that, just clean oil now.
But I do have to drain the condensor every third ride. I was
surprised at how much water there was involved.

Anyway, glad the bike is running better with more miles, sound
like things are getting mated in better.

As for the venting system I have not worked on the earlier version
with the rotory valve, I got one of the primary breathers. I would
hope someone could chime in with some information. Always good
to get some more knowledge.

Pookybear
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Old 04-19-2009, 10:32 PM   #8 (permalink)
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I had a 71 bonneville with the primary case vent and didn't notice any moisture problems, but I didn't have it very long. It was a good bike, I just wanted a pre OIF and/or a 500 because of the size and weight. When I get this one in shape I'm gonna be looking for a 70 or older tr6. I think 70 is when Triumph started the primary case breather.

I thought about perhaps installing in the vent line a small valve on a T below the engine as a trap. We'll see how it does when it has a couple of 100 miles on her, before I do anything.

Thanks again for you help
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