Blowing oil smoke
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Blowing oil smoke
I recently installed a fairly fresh 390 into my F100 recently, and was having a hell of a time figuring out why I was burning oil in it before I threw a cap for the crank in it on a test drive.
The 390 was out a '68 mustang and looked very clean when I bought it..There was still plenty of cross hatches in the engine, and when I added a couple ounces of oil to all the bores and left it over night, the same oil was there in the morning. The guides in the heads were pretty shot, so I sen the heads in to my machine shop and the guys put new valves, guides, exhaust seats in and resurfaced the head .006
In my thought process, I figured it can't be heads, because they are fresh, and I had smoke initially when I lit it off before doing the heads.
This makes me think rings...but my leak test with the oil tells me otherwise.
Is there any other way oil can be introduced to the combustion chamber?
help
The 390 was out a '68 mustang and looked very clean when I bought it..There was still plenty of cross hatches in the engine, and when I added a couple ounces of oil to all the bores and left it over night, the same oil was there in the morning. The guides in the heads were pretty shot, so I sen the heads in to my machine shop and the guys put new valves, guides, exhaust seats in and resurfaced the head .006
In my thought process, I figured it can't be heads, because they are fresh, and I had smoke initially when I lit it off before doing the heads.
This makes me think rings...but my leak test with the oil tells me otherwise.
Is there any other way oil can be introduced to the combustion chamber?
help
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Intake manifold gaskets.
Do this: Put the tranny in 2nd (or 3rd if it's one of those 435NP's with a granny first). Rev it up to 4000+RPM, let off and coast down to 1000RPM or so, then gun it again.
If it let's out a huge PUFF of blue smoke when you get back on the go-pedal, it's the intake gaskets sucking oil under vacuum.
Been there, done that, got the t-shirt
Do this: Put the tranny in 2nd (or 3rd if it's one of those 435NP's with a granny first). Rev it up to 4000+RPM, let off and coast down to 1000RPM or so, then gun it again.
If it let's out a huge PUFF of blue smoke when you get back on the go-pedal, it's the intake gaskets sucking oil under vacuum.
Been there, done that, got the t-shirt
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