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8N Blowing oil out filler tube

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Robert Hargis (

06-01-2007 06:16:28




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I have recently changed the oil, oil filter, plugs, points and condenser on the '51 8N. It has now started blowing oil out the filler tube... Could this be caused by because I didn't set the timing, firing before the valves are fully down, and forcing the gasses into the crankcase? I can't imagine that the oil filter, or changing oil would cause this...




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mad farmer

06-01-2007 14:26:17




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 Re: 8N Blowing oil out filler tube in reply to Robert Hargis (TX), 06-01-2007 06:16:28  
Is the oil level correct? If you overfilled crankcase that can spashing up into the filler tube.



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roger '40 9n

06-01-2007 10:10:21




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 Re: 8N Blowing oil out filler tube in reply to Robert Hargis (TX), 06-01-2007 06:16:28  
Iffn it was firing with the valves open it would blow exhaust out the exhaust pipe or into your carb and air intake not into your crankcase.

You have worn rings letting the exhaust gas get past 'em and into your crankcase. That is why modern cars have crankcase ventilation valves (PCV) so as to re-burn the smoke.

Is somewhat normal. Do A compression test to see what is happening....

Roger iN MichigaN

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Dell (WA)

06-01-2007 07:31:20




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 Re: 8N Blowing oil out filler tube in reply to Robert Hargis (TX), 06-01-2007 06:16:28  
Tex..... ...ya write..... ."Could this be caused by because I didn't set the timing, firing before the valves are fully down, and forcing the gasses into the crankcase?"..... ..not really, but a very imaginative miss-understanding of engine operation.

You write..... "I can't imagine that the oil filter, or changing oil would cause this"..... .wanna bet??? ..... Heres the deal..... .you did "sumptin" (change oil, thats good to do) and now yer hyper-sensitive for non-normal engine operation (smokin' out breather) Welp, smokin' out the breather is "normal". (semi-normal ennyways) Yer just seeing it for first time 'cuz ya been "sensitized".

It could be something as simple as cool morning air condensing water vapor from combustion.

Or..... it could be clean oil "washed" away gunk around yer very worn piston rings and now yer seeing the effect (smoke) of worn tired out engine that is down on power, that you gave a tune-up to. (to restore power) The ONLY WAY to check this is by the DREADED compression test. Ford specs: 90psi, min (dry). Then do a "wet" test to check the ring seal-ablility.

Iff'n you don't know how to do a compression test, ask, or read instructions ...or... brouse the archives of this great N-Board..... ..Dell

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arthur ward

06-02-2007 04:59:25




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 Re: 8N Blowing oil out filler tube in reply to Dell (WA), 06-01-2007 07:31:20  
forgot to mention, i did my compression test first also. i didn't believe that the rings were worn because i had 122 or so across the board. well, the builder told me that is because the rings are so worn that the oil slipping past the rings was actually giving me a "wet" test all the time. i scratched my head on that one but he was correct. total wear of the rings and i requested my old parts after rebuild. my oil rings were per tin ear worn completely out.

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arthur ward

06-01-2007 07:18:28




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 Re: 8N Blowing oil out filler tube in reply to Robert Hargis (TX), 06-01-2007 06:16:28  
I believe they call that blow by and sounds like you may need a ring job. Just went thru this with my 49 8n.



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AnvilheadTX

06-01-2007 09:38:49




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 Re: 8N Blowing oil out filler tube in reply to arthur ward, 06-01-2007 07:18:28  
This happened to an 8N I purchased that had sat for 10 years. The blow-by was pretty severe. I followed Dell's (and others) advice and did the compression test. The results was low compression (30 psi) in one of the cylinders. I now refer to this tractor as my "project tractor" and will one day shortly get to experiecne learning about the inner workings of an engine block.



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