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Ford Tractors Discussion Forum
Show Parts for Model:

Smoking Naa with Very Good Compression

Author  [Modern View]
KCTractors

10-15-2012 17:47:20
166.181.3.126



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This is a NAA 134 engine, it has 125 lbs of compression in every cylinder, but smokes blue when running. Would it be the oil rings that bad only or anybody have any other ideas. The engine runs good but smokes.Just picked this thing up.




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ericlb

10-18-2012 07:52:01
75.107.64.57



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
does squirting a little oil into the cylinder before putting the compression gauge on it change the readings? if it does significantly, it probably has worn rings, if not there is another issue going on and will need further investigation, pull the valve cover off and see what the top of the head looks like, clean ect or nasty causing oil to not drain back down to the pan and probably fouling the valve guides

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soundguy

10-16-2012 06:04:51
184.246.120.224



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
as the others siad.. could be LOTS of things.

COULD be oil rings

COULD be valve guides.. etc.

and yeah.. an oily cyl likely DOES have good compression due to oil sealing the rings. same as a wet comp test.



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GVSII

10-17-2012 13:41:56
74.71.178.71



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 Re: Smoking Naa with Very Good Compression in reply to soundguy, 10-16-2012 06:04:51  
Quoting Removed, click Modern View to see


Seen them smoke like a chimney from burning oil.Do a compression check and pass with flying colers.



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36 coupe

10-16-2012 03:48:55
66.186.169.176



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
An engine that is pumping oil can show good compression.Oil will usually seep out of the spark plug threads and the plugs will foul often.I dont know how oil gets past the plug gaskets but it does.Cured a smoky Farm All A with an oil change and a pint of MMO.Put it to work raking hay and the smoking backed off.Engines with worn valve guides will smoke if idling long be cause vacuum is highest at idle.

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George Marsh

10-15-2012 19:01:03
50.104.232.125



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
KCTractors
When you choke any engine it will burn oil because the rich mix washes oil off cylinder walls. Is it possible your carb is too rich? Take a look at your plugs. If you are burning oil, there should be deposits on plugs instead of a clean gray look.

Had a 70 dodge spirit with bad exhaust valve guides. It was a problem with the 3.0L engine design. It would produce a smoke screen. So as mentioned, it could be a valve guide problem. If it's exhaust guide, the plugs will not show it's burning oil, because the oil only gets into the hot exhaust gasses.

I have a 20 hp kohler engine. Had to go with the next hotter plug to keep carbon off plug. Engine doesn't use a drop of oil in 75 hours. After that it starts using oil. Time to change oil. It too will give off a puff of smoke when I choke it.

Keep looking, you will find the problem.

George

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KCTractors

10-15-2012 19:40:43
166.181.3.44



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 Re: Smoking Naa with Very Good Compression in reply to George Marsh, 10-15-2012 19:01:03  
George, you might have hit the nail on the head , it does need some carb work. Thanks



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George Marsh

10-17-2012 18:45:43
50.104.232.125



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 19:40:43  
KC,
If I recall your carb has two adjustments. One of the adjustments is backwards, meaning the more you screw it outwards, the leaner it gets. Again, I can't remember. Look at your manual. There are many here who don't suffer from CRS like me. They can give you better info about carb adjust on the Naa.

I know for a fact, my IH C has only one adjustment, someone screwed it all the way in and the fuel mix was way too rich.

George

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ErnieD

10-15-2012 18:24:01
67.253.193.102



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
Poor drain down from rocker area, flooding guides.



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Dean

10-15-2012 18:18:34
152.216.3.5



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 Re: Smoking Naa with Very Good Compression in reply to KCTractors, 10-15-2012 17:47:20  
It could be the oil control rings but more likely it is worn intake valve guides and/or defective or missing seals.

Check the oil in the air filter before doing anything else.

Dean



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