1969 Deville oil leak

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The Classic Cadillac Forum Discussion, 1969 Deville oil leak in Past Cadillac Vehicle Discussion; Hello people I'm new here and I need advice. So i have oil leak on one cylinder it's going out ...
  1. #1
    Bigcaddy69 is offline Cadillac Owners Member
    Automobile(s): 1969 cadillac deville
    Join Date
    Oct 2013

    1969 Deville oil leak

    Hello people I'm new here and I need advice. So i have oil leak on one cylinder it's going out through exhaust. My shop guy wanna make more money out of it I believe . It was running car before I brought the car to shop I didn't have that problem now I do. He replace the gaskets after that it's start leaking and now he is saying that piston or bad u gotta rebuild the engine because the car was standing for long time which it's was not my fault that car was standing there for long time like 3 month. I'm trying to take to other shop well before that I decide to get advice from you guys what could be the problem . It's could be the piston or something else thank u

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  3. #2
    Jeff R's Avatar
    Jeff R is offline Cadillac Owners Enthusiast
    Automobile(s): 1970 Coupe De Ville//Cessna 172
    Join Date
    May 2013
    St. Louis

    Re: 1969 cadillac deville oil leak

    If there is so much oil that it is in the exhaust then you may have an issue. The first thing you need to do is determine how much oil is in the cylinder. If there is a lot, do not run the engine. Oil will not compress like air and you could have a hydrulic lock situation which would damage the rod,etc. Pull the plugs and ID which cylinder it is by the oil on the plug. Then see if the cylinder has compression. The cheap way is to slowly rotate the engine (in the correct direction) while you ave a finger over the plug hole and see if you get air blowing out and then air sucking in. Now I'd say pull all the other plugs so there is no compression and the engine will be easy to rotate. Rotate it by hand to be on the safe side. With all the plugs out there will be no compression and most importantly, it will not fire Key off of course. If the cylinder has compression, then you don't have a hole in your pistion. There are many other reasons the cylinder could be full of oil but if it has been sitting for a while you could have stuck rings or the drain holes in the cylinder head could be plugged allowing oil to drip in from the top thru the valves. I'm sure there are threads on that issue. Be sure to mark which plug wire goes to which plug or you will have a long day ahead of you. Most importantly, if you are going to be working by the fan/fanbelts,etc trying to rotate the engine, you need to be sure there is no way the engine could fire.
    Good luck.
    70eldo likes this.

  4. #3
    twiztedlacs is offline Cadillac Owners Member
    Automobile(s): 1969 Convertible
    Join Date
    Sep 2013
    What was the reason you took it into the shop for and what gaskets did he replace?

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  6. #4
    77CDV's Avatar
    77CDV is offline Cadillac Owners 10000+ Posts
    Automobile(s): 77 CDV, 06 DTS III, 69 FWB
    Join Date
    Mar 2006
    Newbury Park, CA

    Re: 1969 cadillac deville oil leak

    So let me understand this. You drove the car to the shop and it was running with no oil leak issues. Now it's leaking oil into one or more cylinders and does not run. What gaskets were replaced and why? Need more information.

  7. #5
    SWEENDOG1969 is offline Cadillac Owners Member
    Automobile(s): 90k 1969 Cadillac Hardtop Sedan Deville
    Join Date
    May 2005

    Re: 1969 cadillac deville oil leak

    so what gaskets did he replace? If it ran good or bad it should run good or bad when it came out. I.M.O. its sounds like they are trying to hose you. Unless they dropped something in there and f'd it up and dont want to say anything. And will it run on 7 cylinders long enough for you to get it home/will it damage the engine doing so? I was wondering this because i've crossed the plug wires on mine and drove it (forget cadillac was different order than chevy). But if you left the plug out or wire off/plug out could it be limped home and do your own research as the cause or have a different shop look at it.

  8. #6
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
    Join Date
    Sep 2005
    Dutchman in Germany

    Re: 1969 cadillac deville oil leak

    Where are you located?

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