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Hi,

I'm posting these questions here because everything indicates my 47 Roadmaster is just a continuation of the 1942's.

My 320 spits out some black oil on the back wall of my garage upon start up, but does not burn oil under way except during de-celeration - very noticable long downhill grades. Would this be symptoms of valve guide leakage rather than rings?

The manual in 1947 calls for 20 weight oil and I run 10W30. I'm a little reluctant to run anything heavier to cut down the smoke. Any opinions?

Also there is no evidence that this car ever had an oil filter, yet I see them on most Buicks of that era I encounter. You would think the top of the line car would have one.

Thanks for the help.

Sherlok

I just love driving this big hog !!! <img src="http://forums.aaca.org/images/graemlins/smile.gif" alt="" />

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One other place to check is the vacuum section of the fuel pump. Remove the vacuum line that goes into the manifold, and check for oil.. If any is present, the diaphragm on the vacuum side of the pump is leaking permitting oil to be burned. Just replace the fuel pump, and have yours rebuilt.

Suggest Parts Cellar.

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haha this is funny because i get something similar that my mom always scolds me about but i dont know what to do (well actually i could remove the turndown tip at the end of the tailpipe but man, i like it!)

when i first start my '38 special and especially if i rev it just a little, it spits out a spray of which i determined to contain soot and water. i guess condensation inside the exhaust takes some of the carbon deposits off and then when it gets shot out brings the cabon with it? well whatever the case its always funny, to fire it up, then walk out behind it and see what looks like the result of my car having eaten too many spicy tacos for lunch. <img src="http://forums.aaca.org/images/graemlins/shocked.gif" alt="" />

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In answer to Thriller, it is indeed oil as I have to add a 1/2 quart every 200 miles or so. It maybe running rich as well, but I would like to control the oil problem. I'll check the fuel pump too as Straight Eight suggests. Good points fellows.

Thanks,

Sherlok

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My '41 mod 46 is also a member of the BSCA (Black Soot Club of America). But I have one distinct advantage over the posters to this thread. I have a Y pipe dual exhaust, so I have the pleasure of two black soot marks which don't quite make it to the garage wall because my work bench is in the way. It is a little frustrating to squeeze between the rear of the car and the work bench with a pair of light colored pants and to look down at the pants and say, Aw ----!"

Had the front carb rebuilt, and when that only caused a 7 mpg (8 to 15) increase but no reduction in soot, decided it was time for an engine rebuild (106K miles). Will update with a posting when I get it back from the rebuilder. I will not be a happy camper if it turns out to be still a pant leg blackener.

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Unclefogey, I have a bad feeling you'll still be in the Black Soot club...but, you won't be in the haze of oil from the draft tube in your rearview mirror when somebody is tailgating you at night with their headlights on club! That has to be a good club to be in!

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