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  #11  
Old 23rd May 2019
Four Speed Four Speed is offline
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Quote:
The umbrella valve doesn't really do much except ensure some circulation in the upper rocker, instead of the same stale air staying stagnant
This is a 1988 engine; there are no head breathers. And, non-return valves do affect crankcase compression.
There seems to be oil misting from several gaskets and seals. Excessive crankcase compression could well be an issue
as could blow-by. It may not turn out to be the PCV but is easy to check and eliminate.
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  #12  
Old 23rd May 2019
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Quote:
Originally Posted by Four Speed View Post
And, non-return valves do affect crankcase compression.
There seems to be oil misting from several gaskets and seals. Excessive crankcase compression could well be an issue
as could blow-by. It may not turn out to be the PCV but is easy to check and eliminate.
That's what struck me first was all of them leaking at the same time pointing to cc pressure being too high.
I'd check the cam chest breather as mentioned and if it turns out to be OK, then move to a compression test as mentioned.

If this engine has sat for a number of years, the seals 'could' have some settled weepage.
But, cleaning that off and seeing it come back leads to other things.
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  #13  
Old 24th May 2019
Four Speed Four Speed is offline
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Quote:
That's what struck me first was all of them leaking at the same time pointing to cc pressure being too high.
Exactly. That points to at least two possibilities.
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  #14  
Old 24th May 2019
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Quote:
Originally Posted by Four Speed View Post
This is a 1988 engine; there are no head breathers. And, non-return valves do affect crankcase compression.
There seems to be oil misting from several gaskets and seals. Excessive crankcase compression could well be an issue
as could blow-by. It may not turn out to be the PCV but is easy to check and eliminate.
My bad, I thought it was the same setup as the later style, since my 86-03 manual shows every model with umbrella valves in the rocker box. I still don't think it could affect compression measurably, though, unless your rings aren't sealing.
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  #15  
Old 24th May 2019
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Compression is not the issue.
Compression is measured on top of the pistons.
Crankcase pressure is on the bottom of the pistons.
There is a balance of cc pressure.
We need some of it to move oil around in the engine.
It's increased with worn rings (blowby) as more of the compression runs down into the crankcase.
Rings never seal fully. There is the matter of clearances and the split in the rings.
Some blowby actually assists cc pressure. Too much blowby would be an issue.

It's also increased with a breather valve not opening and closing properly.
If the pressure can't leave the valve faster than more pressure is created in the crankcase, internal pressure is raised.

If the breather doesn't close down when the pistons rise, vacuum pulls back air in the engine from outside then that air is added to the piston downstroke.
Then you get oil puking out the breather also.

Last edited by Hippysmack; 24th May 2019 at 14:44..
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  #16  
Old 24th May 2019
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........plus more aeration of the oil in the oil pump. And oil seepage at the gaskets and seals; which is what it looks like here.
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  #17  
Old 24th May 2019
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Wow thanks for all the info guys. I will do a compression test and see what I checked the breather valve and it did seam to be working correctly. The oil gets to 90 C or around 194 F.
Will buy a new breather valve anyway if there getting rare!
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  #18  
Old 24th May 2019
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Good, the breather should only flow one way. Let us have the compression figures when you can.

The umbrella valve is: 26856-82. Note it is NOT the same as the later head breather valves.
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  #19  
Old 24th May 2019
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I'm not sure when they changed but my 05 doesn't have the umbrella valves.
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  #20  
Old 25th May 2019
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It was 04 Gunner.
All breathers have an umbrella valve.
Depending on year model, it's basically just packaged differently.
Here is the Sportsterpedia page on crankcase venting for all Evos with pics:
http://sportsterpedia.com/doku.php/t...:evo:engmech07
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