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Oil in the intake passages.

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nondem

05-14-2008 20:04:21




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I got the new manifold in today and installed it - sure is quiet now :) Layered aluminum foil sure sealed up the clamp area well....

I've run the tractor about two hours and changed the oil 3 times - the last two times I used 40W. Oil pressure is good at any temp. The tractor doesn't smoke hardly at all when started but it increases...When running the tractor it's very minor except when under load - it gets worse under load. Hasn't fouled a plug...runs/starts good - has more power than the tires can deliver. I would describe the smoke output to equal to what you would expect to see out of a similar diesel tractor.
When I pulled the old manifold I noticed that the intake passages in the block had wet motor oil in them. both of them had it but one had a bit more than the other. There is no oil coming into the carb from the air-cleaner. What does this mean?

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nondem

05-15-2008 09:42:16




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 Re: Oil in the intake passages. in reply to ZANE, 05-14-2008 20:04:21  

Bob said: (quoted from post at 11:47:16 05/15/08) I agree with you Dunk.

Not only is a "flatty" a different "animal", in that the valves are upside-down compared to on OHV meaning the oil has to travel UPHILL to get past the guides, but also there's just not much oil in the "tappet boxes" low down on the side of the block. On an OHV, the valvestems are BATHED in oil, dripping down from the rocker arms, and it even tries to sneak downward past the valvestems after the engine is shut off!


I don't see how oil that got passed the rings would run uphill and against strong airflow through the intake valve hole. Of course I'd like to qualify that by pointing out that I'm someone who has no experience w/flatheads beyond the briggs and stratton variety :)
I did think of another possible cause - I had every part of this engine soaking in various lubricants while it was seized and while the engine has 2+ hours on it now - it's never gotten very hot. Maybe it's just residual...but it sure looks/feels like the same stuff swimming around the crankcase right now....

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souNdguy

05-15-2008 06:08:34




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 Re: Oil in the intake passages. in reply to nondem, 05-14-2008 20:04:21  
My guess is she is just pumping a bit of oil.. perhaps a bad oil control ring in a cyl.. etc.

soundguy



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nondem

05-15-2008 05:04:28




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 Re: Oil in the intake passages. in reply to Hobo,NC, 05-14-2008 20:04:21  

Dean said: (quoted from post at 07:12:16 05/15/08) ND:

Remove your air cleaner and clean it.

More than likely the mesh is badly clogged with debris, the oil cup has too much dirt in the bottom and/or is overfilled or some combination of the above.

Dean


No oil is coming from the air cleaner - the pipe from it to the carb is dry and the carb throat is too.

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Dean

05-15-2008 04:12:16




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 Re: Oil in the intake passages. in reply to nondem, 05-14-2008 20:04:21  
ND:

Remove your air cleaner and clean it.

More than likely the mesh is badly clogged with debris, the oil cup has too much dirt in the bottom and/or is overfilled or some combination of the above.

Dean



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old

05-14-2008 20:59:48




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 Re: Oil in the intake passages. in reply to nondem, 05-14-2008 20:04:21  
Seals on the valve guides might be old and letting some oil by. Exhaust valves don't have the o-ring sort of seals but the intakes do and when they get old they can leak some oil. But as long as its running well and doesn't foul plugs I would probably just leave them alone till the oil causes problems



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Dunk

05-14-2008 20:11:10




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 Re: Oil in the intake passages. in reply to nondem, 05-14-2008 20:04:21  
That is an amazing thing..

That would seem to mean that the valve guides are worn.

But on a flat head engine, I have trouble seeing it suck that much oil thru them...

I may be wrong though...



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Bob

05-15-2008 08:47:16




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 Re: Oil in the intake passages. in reply to Dunk, 05-14-2008 20:11:10  
I agree with you Dunk.

Not only is a "flatty" a different "animal", in that the valves are upside-down compared to on OHV meaning the oil has to travel UPHILL to get past the guides, but also there's just not much oil in the "tappet boxes" low down on the side of the block. On an OHV, the valvestems are BATHED in oil, dripping down from the rocker arms, and it even tries to sneak downward past the valvestems after the engine is shut off!

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