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1976 Eldorado oil leak
10-31-2013, 04:14 PM
Post: #1
1976 Eldorado oil leak
I just bought a 76 cadillac eldorado that has a small oil leak somewhere. I haven't looked into it too much, but I was wondering if anyone could tell me where the oil could be leaking from.

I'm assuming it's just a matter of replacing an o-ring somewhere, but I am very new to this and don't know where the leak even could be coming from exactly. I was hoping to replace a lot of connections anyway for prevention sake, so if there are any other o-rings or seals that should be replaced that you're aware of, please let me know.

Thanks for your help guys!
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10-31-2013, 08:58 PM
Post: #2
RE: 1976 Eldorado oil leak
It could take a long time to tell you where the oil “Could” be coming from. First of all, is it Motor oil, Transmission oil, Power Steering oil, Brake Fluid, A/C lube oil… ? You are going to have to narrow things down a little. You may have to wash things off due to the fact that the oil can be blown around by the fan & air from road speed. Once clean you can start it up and let it warm up and watch to see if you can get an idea of where it’s coming from. It could be something as simple as a loose clamp or bolt to something as complex as a warped head.

Check it out a little better and get back to us.

Thanks for using the forum,
Garner

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10-31-2013, 11:15 PM
Post: #3
RE: 1976 Eldorado oil leak
Hint... if you park in the same spot each night then lay down a large piece of clean cardboard under the suspected area. This will narrow down where the leak is and also help identify the color of the fluid. Each fluid is a different color and some even have their own smell and feel.

Another hint: brake fluid and coolant will wash off your fingers with plain water.

Last hint: whatever you have been adding is probably what's leaking. What have you filled up recently?

The more you can tell us the better we can help you!
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11-01-2013, 04:02 AM
Post: #4
RE: 1976 Eldorado oil leak
(10-31-2013 11:15 PM)Rupe Wrote:  Hint... if you park in the same spot each night then lay down a large piece of clean cardboard under the suspected area. This will narrow down where the leak is and also help identify the color of the fluid. Each fluid is a different color and some even have their own smell and feel.

Another hint: brake fluid and coolant will wash off your fingers with plain water.

Last hint: whatever you have been adding is probably what's leaking. What have you filled up recently?

The more you can tell us the better we can help you!

to be honest, I just bought this car yesterday. I haven't put anything in it but gas, but the previous owners told me about the leak. The oil is not on full, but it's far from empty. It's last oil change was mid July. I believe I might have found it though.

I was looking under it and saw that the crankshaft was extra oily, and some parts underneath seem to be coated in oil as well. to me, it looks like it needs a new crankshaft seal, does that sound like something that could cause a slow oil leak?
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11-01-2013, 11:14 AM
Post: #5
RE: 1976 Eldorado oil leak
Yup, that's very possible.

What I would do is clean the area then watch it for a few days to see if it returns in the suspected location. It may be the front seal (behind the pulley) or it may be the timing cover gasket. Either one can be a chore to replace.

Things to consider: There are replacement seals made with a slightly different off-set so if the mating area on the pulley is worn it will not ride in the same place. If the area in question is too worn then a new pulley may be required. If a new pulley or off-set seal is not available then there are "wear sleeves" that can be pressed into place to solve that problem.

BTW, sometimes it's not the front seal at all. On many vehicles there's a timing sensor in that general location and it's sealed up with an o-ring. When they leak it looks just like the front seal has gone bad but it will take a sharp eye to spot it. If you have low miles I would go there first. It's an easy fix all things considered. Usually one or two bolts then remove the clip and pull it out by hand.
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11-17-2013, 04:40 PM
Post: #6
RE: 1976 Eldorado oil leak
Just fixed this yesterday, here's what happened for future reference.

It turns out that my harmonic balancer had developed a nice groove in it after 37 years, so it was no longer as snug as it should have been. This messed up my front seal a touch, resulting in a small oil leak. To fix this, I replaced the front oil seal, and purchased a harmonic balancer repair sleeve from rockauto.com for around $30 so I won't have to replace the seal again for a long time.

Here's the repair sleeve if anyone needs to see it. That installation sleeve was a joke though, I wound up have to press it on using random sockets to make contact with the sleeve.

http://www.rockauto.com/catalog/moreinfo...cc=1409385

I could see as I too the balancer off that oil was leaking from the front seal directly. It was a small leak like I was told, and an oil sealer would have probably fixed it for a while, but I figured I would do it right.

Thank you for all of your help guys!
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11-17-2013, 04:59 PM
Post: #7
RE: 1976 Eldorado oil leak
Thanks for the follow up and that "wear sleeve" is exactly what I was talking about.

Oh, and you are correct in that certain cases the "install tool" they supply doesn't always work. Guessing 50% of the time I wind up using a hammer and punch or a socket. (carefully) Glad you were able to figure things out.
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