272 Smoking when shut off? - Ford Truck Enthusiasts Forums



272 Smoking when shut off?

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Old 07-14-2014, 09:13 AM
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272 Smoking when shut off?

I rarely open the hood of my 56 F100 after driving because it's such a PITA. But yesterday I opened the hood after taking it for a 5 mile run. There was a pretty fair amount of smoke coming from the ole 272's oil filler cap. I started the engine again and no smoke, stopped it and it started smoking again. The truck has a road draft tube (no PCV) and both the screen in the road draft tube & the filler cap are new (less than 100 miles).

Is this an indication something's wrong? Any opinions or solutions?
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Old 07-14-2014, 04:24 PM
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I'd bet it's not smoke, just hot vapors. What kind of condition is the motor in? Dennis
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Old 07-14-2014, 04:30 PM
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Not sure. It ran well 25 years ago then sat until last year. I changed the oil & Filter, replaced the fuel pump, road draft screen and oil cap, cleaned out the fuel tank & carb. Started right up. Ran it for about 50 miles and changed the oil and filter again. Seems to have plenty of power, starts right up. Has a 4 barrel ford manifold with a 390 CFM Holley.
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Old 07-14-2014, 06:52 PM
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A pcv system would probably take care of that. Personally I like the smell in the garage when I bring the truck or car in. Dennis
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Old 07-14-2014, 08:25 PM
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It only smokes after I shut it off. Been thinking about changing over to a PCV system but was afraid the smoking might mean that the ole gal is getting too hot. I did have the radiator repaired and changed the water pump, hoses & thermostat.
Also added Petronix electronic ignition and coil.
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Old 07-14-2014, 08:42 PM
85e150six4mtod 85e150six4mtod is offline
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Engines of that era produce lots of blow-by fumes, vaporized or misted oil and steam from condensation in the crankcase "burning off".
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Old 07-16-2014, 09:48 AM
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Quote:
Originally Posted by 85e150six4mtod View Post
... lots of blow-by fumes, vaporized or misted oil and steam from condensation in the crankcase "burning off".
That is exactly why you should install a PCV system to get rid of all the "blow-by fumes, vaporized or misted oil and steam from condensation" from your crankcase.

Your engine will love you for it. Good for the environment also.
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Old 07-16-2014, 06:15 PM
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It's normal for that era. The road draft tube mechanism only works efficiently when moving. Not a cause for concern.
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Old 07-16-2014, 08:46 PM
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Here's what the ole Gal looks like.
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Old 07-16-2014, 09:19 PM
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Yep. Nice looking mill ya got there!
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Old 07-17-2014, 02:05 AM
85e150six4mtod 85e150six4mtod is offline
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No surprise there. Maybe a bit on the high side. How long did it run before it was shut down there?
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Old 07-17-2014, 10:18 AM
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Maybe 20 mins. I just took it for a drive. I had some carb problems and had just replaced the old Holley 4 Barrel (390CFM) with one I had just rebuilt.
Funny thing is the cooling system was still cool enough I could stick my finger in it and not get burnt.
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