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Oil in intake

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RB(VA)

06-10-2004 11:07:30

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Have a '51 8n that has been fouling plugs after 10 to 15 hrs of run time on a set of autolite 437's. This is the third or fouth set now.
Removed the manifold to access the valves to check clearances and both intake runners had oil in them.
The tractor does not use oil, I can run it for 8 hrs pulling a bottom plow and the oil level does not change.
The exhaust does stay smutty though.
I know there is too much play in the dist. bushing.
Any idea where the oil could be coming from?
Roy

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ZANE

06-10-2004 19:33:17

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Re: Oil in intake in reply to RB(VA), 06-10-2004 11:07:30

The only way that oil can get into the intake is from the oil bath air cleaner. May be over full or the oil may be displaced by a cup full of dirt instead of the oil.

Could also be a varmit made a nest in the intake of the air cleaner. I have seen both wasp nests and dirt dobber nests in the air intake of the air cleaner and it will make the engine run like the choke is out all the time no matter how the carburetor is adjusted.

Take the hose off the intake and see if that corrects the fuel supply problem. If it does then look to the air cleaner/filter.

Do not run the tractor very long with the intake hose off the carburetor as the dust can ruin the rings in short order.

Zane

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RB(VA)

06-11-2004 05:19:57

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Re: Re: Oil in intake in reply to ZANE, 06-10-2004 19:33:17

Thanks, guys
I had not given the air filter a thought, I'll check it out. I know that the filter element(mesh) in it is not the original.
I'll let you know what I find.
Roy

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Dell (WA)

06-10-2004 18:17:37

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Re: Oil in intake in reply to RB(VA), 06-10-2004 11:07:30

Roy..... ...you write "any idea where oil in the intake manifold comes from?"..... how about overfull oilbath airfilter?

Nevertheless, I'd do the dreaded "compression test" to rule out pumping oil past yer piston rings. Ford specs: 90 psi min (dry)..... ...Dell

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Dan

06-10-2004 12:06:15

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Re: Oil in intake in reply to RB(VA), 06-10-2004 11:07:30

It is possible you are drawing oil up through your intake valve guides on the intake stroke. Do you know if you have seals on your intake valve guides?

Good luck,
Dan

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souNdguy

06-10-2004 11:12:29

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Re: Oil in intake in reply to RB(VA), 06-10-2004 11:07:30

Does it smoke blue? If not.. the sooty exhaust may be rich carb. Sooty plugs foul just as bad as oily plugs.

That said.. how's your compression? Might have a bad oil control ring.. but not too bad if it doesn't smoke.

Can't help you with the valves.. not my area.

Soundguy

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RB(VA)

06-10-2004 11:30:00

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Re: Re: Oil in intake in reply to souNdguy, 06-10-2004 11:12:29

souNdguy,thanks for the quick reply, but no, it doesn't smoke, but I have suspected a rich mix because the stay chain at the exhaust stays a sooty black.
The carb power jet seems to either be rich or lean with no adjustment in between. It is set at about 7/8 turn which gives the smut. If I lean the mix I get a hesitation when I open the throttle and a drop off in power.
Any thoughts here?
thanks, Roy

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souNdguy

06-10-2004 11:37:07

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Re: Re: Re: Oil in intake in reply to RB(VA), 06-10-2004 11:30:00

That telltale softsooty black stay chain is a giveaway for a rich mixture. Perhaps a carb cleaning/rebuild is in order.

If it were oil.. anitfouling adapters would bandaid it a bit.. but soot from a rich mixture will find the plugs in the anti-fowlers as well.

I would look to the carb first, especially since it doesn't smoke blue or use oil.

Soundguy

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