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Harry Ferguson Tractors Discussion Forum
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Exhaust gasses coming from Breather tube.

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Jeff-oh

05-04-2004 08:48:26




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TE-20 with Z-120 engine:

Over the weekend I noticed a small amount of exhaust gas "smoke" coming from the breather tube on the left side of the engine. Is this something to be concerned over? All seems to run well.

Your thoughts please.

Jeff




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txblu

05-04-2004 12:19:14




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 Re: Exhaust gasses coming from Breather tube. in reply to Jeff-oh, 05-04-2004 08:48:26  
Pressure is building up in your crankcase. The up and down movement of the pistons equals out and the average value is zero.

Piston ring blow by however, will allow combustion pressure and gasses to enter the crankcase.

In the automotive industry, the Positive Crankcase Ventilation (PCV) system routed this gas back to the carburetor where it was burned with fuel. We never thought about it again.

What one doesn't realize is that engines still do it, you just don't see it.

I'd guess that you could go a hundred thousand miles (so to speak), with correct engine servicing, before you had to worry about new rings. If it is just now noticeable.

If it is a problem, I have routed it back to the intake manifold on several tractors with a hose slipped over the tube and the other end tapped into the manifold. Out of sight, out of mind and for me out of MY NOSE. IT STINKS.

Hope this helps.

txblu

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Jerry/MT

05-04-2004 13:10:15




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 Re: Re: Exhaust gasses coming from Breather tube. in reply to txblu, 05-04-2004 12:19:14  
Jeff,
That breather tube is for blowby gas (the stuff that leaks around the rings)and vapors from hot oil (including water, condensed from the atmosphere when the engine is cold, that evaporates from the hot oil, etc).Excessive blowby combined with low compression usually means your rings are worn. What's excessive? In my opinion, when it begins to look like your exhaust pipe flow ands your compression is at the lower service limit! Hope this helps.

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Jeff-oh

05-05-2004 05:49:08




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 Re: Re: Re: Exhaust gasses coming from Breather tu in reply to Jerry/MT, 05-04-2004 13:10:15  
Thanks,

That is what an A&P (Airframe and Powerplant) guy here was telling me. It is not too excessive. I guess I'll have to go and get a compression gauge.



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txblu

05-05-2004 09:53:39




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 Re: Re: Re: Re: Exhaust gasses coming from Breathe in reply to Jeff-oh, 05-05-2004 05:49:08  
What for? Are you just looking for something to do? Not being smart a$$ed but "if it ain't broke don't fix" unless you are bored with deep pockets.

Just Askin'.

Mark



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Jeff-oh

05-05-2004 12:26:26




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 Re: Re: Re: Re: Re: Exhaust gasses coming from Bre in reply to txblu, 05-05-2004 09:53:39  
The reason why is to see if it is Broke before it gets broke more. Possibilities include a blocked oil passage to a clogged oil filter. Could be light blow by or excessive blow by. Testing is easy enough.

Jeff



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Jeff-oh

05-05-2004 12:28:32




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 Re: Re: Re: Re: Re: Re: Exhaust gasses coming from in reply to Jeff-oh, 05-05-2004 12:26:26  
Also, we may be discussing two different areas. the breather tube I am looking at comes out of the valve cover not the crank case.



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Jerry/MT

05-05-2004 21:12:00




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 Re: Re: Re: Re: Re: Re: Re: Exhaust gasses coming in reply to Jeff-oh, 05-05-2004 12:28:32  
The breather tube comes out of the valve cover but if you remove the valve cover you'll see large "slots" cast in the head that go through the similar "slots" cast in the block that connect to the crankcase.



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