Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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Joined: Aug 2021
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Grease Monkey
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Grease Monkey
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I have been working on cleaning up the engine and transmission and dealing with the oil leaks I find. One engine leak has me puzzled. The copper line that runs behind the carburetor (I believe is the oil feed) seems to have oil leaking from around where it goes into the block. There is no signs of any grommet or seal. Oil runs down from this area pretty substantially after a two or three mile drive. I get nice flow of vapor from the valve cover vents so I suspect it is not a case of too much internal pressure. Any ideas how this was sealed or if a sign of a different cause? Would I mess something up to clean the area and put a little silicon around the pipe where it enters the block.

Thanks

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Filling Station


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The pipe that goes into the block is the oil supply line for the rocker arms. It does fit loose in the hole. Thats why when installing the line it should be running up hill in the block so oil does not follow it on the outside (of the line) and drip on the outside of the engine..

Last edited by Chev Nut; 05/25/22 04:34 PM.

Gene Schneider
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Agree with Gene, i just rebuilt my 1929 engine and when installing hte feed line, i put a droop (like under your sink) on the passenger side of the engine under the push rod cover, and sloped it from the drivers side downward towards the droop. there will be oil running down this tube from the head. lots of oil flowing around to lube up the rocker arms & shafts. the casting is sloped outwards toward the cover and towards the center of each side where the drain back hole for hte oil to return to the oil pan. if hte line is not sloped and have a low spot the oil will run to hte lowest point, collect, and then run off.

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Excellent photos showing a simple fix for one potential oil leakage spot.


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At 14:48 into this video, you see the worker installing and bending the loop on the oil line with what looks like a box end wrench used for leverage.

https://www.loc.gov/item/mbrs02297907


Bill Masters

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