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> Oil leak, What could it be???
jdamiano
post Feb 14 2019, 05:13 PM
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Big oil leak. Changed the cooler seals and pressure switch. Cleaned everything completely and oil everywhere again after a 15 minute drive. I changed my ac belt at the same time I did the seals and pulled the fan to do it. Everything seemed dry behind the ac pulley. Oil galley plugs?? Where the heck are those and how do I check them??
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76-914
post Feb 15 2019, 10:18 AM
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Gasket on oil fill tower; push rod tube seals; valve cover gaskets? IIRC, you need to pull the trans to access the galley plugs.
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rhodyguy
post Feb 15 2019, 10:37 AM
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Clean it, start it, watch it. The galley plugs live behind the fly wheel. Doubt it's them. No way is oil going to migrate to the oil filter area of the case from RMS or GPs
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Dave_Darling
post Feb 15 2019, 11:21 PM
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There are oil gallery plugs behind the fan and fan shroud as well.

Oil pressure switch is a popular leak location. The oil drips down and the blows back. Also if there is no thermostat pulley, the mounting bolt hole can dump a lot of oil because it goes through into the case.

--DD
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jdamiano
post Feb 16 2019, 07:53 AM
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QUOTE(Dave_Darling @ Feb 16 2019, 12:21 AM) *

There are oil gallery plugs behind the fan and fan shroud as well.

Oil pressure switch is a popular leak location. The oil drips down and the blows back. Also if there is no thermostat pulley, the mounting bolt hole can dump a lot of oil because it goes through into the case.

--DD

I have replaced the pressure switch and cooler seals and they look dry. Oil is getting into the shroud. Can I see and replace the galley plugs behind the fan from under the car?
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rhodyguy
post Feb 16 2019, 07:57 AM
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Is there a puddle of oil on top the filter?
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Mark Henry
post Feb 16 2019, 08:20 AM
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QUOTE(jdamiano @ Feb 16 2019, 08:53 AM) *

QUOTE(Dave_Darling @ Feb 16 2019, 12:21 AM) *

There are oil gallery plugs behind the fan and fan shroud as well.

Oil pressure switch is a popular leak location. The oil drips down and the blows back. Also if there is no thermostat pulley, the mounting bolt hole can dump a lot of oil because it goes through into the case.

--DD

I have replaced the pressure switch and cooler seals and they look dry. Oil is getting into the shroud. Can I see and replace the galley plugs behind the fan from under the car?


Sorry no, if it's a galley plug you have to take the fan shroud off to repair.
You would have to tap 3/8th NPT and install pipe plugs. This can be done on an assembled engine by going slow, greasing/cleaning your drill bit and tap plus cleaning often as you go.
There's 5 plugs I do every rebuild, 3 behind the flywheel and two near the filter console.

I agree with cleaning and trying to isolate the leak location.
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jdamiano
post Feb 16 2019, 08:23 AM
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QUOTE(rhodyguy @ Feb 16 2019, 08:57 AM) *

Is there a puddle of oil on top the filter?

There is oil there for sure as well as dripping around and down around filter. Seems like a lot in the middle of the engine. I had the fan and ac pulley off and it was dry behind the ac pulley and seems to start below that.
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jdamiano
post Feb 16 2019, 09:12 AM
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Is this a picture of the plugs. One in and one missing.


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mgphoto
post Feb 16 2019, 09:45 AM
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That looks as if someone used a punch and knocked the lower plug inward.
This is one of the places that are tapped and plugged but also used to bypass oil filter in some trick engines.
There should be threads if it was tapped, but I don’t see any.
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Mark Henry
post Feb 16 2019, 11:21 AM
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QUOTE(mgphoto @ Feb 16 2019, 10:45 AM) *

That looks as if someone used a punch and knocked the lower plug inward.
This is one of the places that are tapped and plugged but also used to bypass oil filter in some trick engines.
There should be threads if it was tapped, but I don’t see any.


No that's normal.
It's a double duty drilling, it's an oil galley plugged (inner plug) and then the oil console feed that is again plugged (outer plug).
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jdamiano
post Feb 16 2019, 12:32 PM
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QUOTE(Mark Henry @ Feb 16 2019, 12:21 PM) *

QUOTE(mgphoto @ Feb 16 2019, 10:45 AM) *

That looks as if someone used a punch and knocked the lower plug inward.
This is one of the places that are tapped and plugged but also used to bypass oil filter in some trick engines.
There should be threads if it was tapped, but I don’t see any.


No that's normal.
It's a double duty drilling, it's an oil galley plugged (inner plug) and then the oil console feed that is again plugged (outer plug).

So those two locations are possible sources for my leak? I’m thinking of pulling the oil filter console to change its gasket and see if I can tell if my leak is coming from those galley plugs while the console is off.
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sixnotfour
post Feb 16 2019, 01:07 PM
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QUOTE(Mark Henry @ Feb 16 2019, 10:21 AM) *

QUOTE(mgphoto @ Feb 16 2019, 10:45 AM) *

That looks as if someone used a punch and knocked the lower plug inward.
This is one of the places that are tapped and plugged but also used to bypass oil filter in some trick engines.
There should be threads if it was tapped, but I don’t see any.


No that's normal.
It's a double duty drilling, it's an oil galley plugged (inner plug) and then the oil console feed that is again plugged (outer plug).



yes your missing the outer plug


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jdamiano
post Feb 22 2019, 03:51 PM
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OK what next. I cleaned everything off real good and laid under the car while it was running for about 30 minutes. Not gonna lie even with my safety pinned jack stands that is scary. It didn’t start leaking until it got up to temp but once it started it leaks bad. It is coming from the center of the engine and flowing right down the case center seam then down the passenger side engine mount. Anything up there other than the main and if it’s the main how hard is that?
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wndsrfr
post Feb 23 2019, 08:32 AM
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QUOTE(jdamiano @ Feb 22 2019, 01:51 PM) *

OK what next. I cleaned everything off real good and laid under the car while it was running for about 30 minutes. Not gonna lie even with my safety pinned jack stands that is scary. It didn’t start leaking until it got up to temp but once it started it leaks bad. It is coming from the center of the engine and flowing right down the case center seam then down the passenger side engine mount. Anything up there other than the main and if it’s the main how hard is that?

Hmmm....not leaking when oil is cold then leaking when it's hot....doesn't the oil bypass the cooler when it's thick & pressure is high then goes thru the cooler when warmed up or some such so unseated cooler seal might be a culprit? Just a thought. Otherwise sounds like front main seal.....
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TheCabinetmaker
post Feb 24 2019, 08:03 AM
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Front main seal! About the only way for oil to get in the fan shroud
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jdamiano
post Feb 24 2019, 01:35 PM
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I just replaced the front main seal. Not too bad a job. The AC adds a bit of work to the project. I really think that should fix the leaking. I could see the oil coming out of the old one before I replaced it. Thanks to everyone who posted responses.
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Rand
post Feb 24 2019, 02:19 PM
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My only experience with a galley plug fail is when it dropped out while sitting in my winter garage and all my oil was all over the garage floor. This makes me think that galley plugs either work perfectly or fail catastrophically and extreme temperature fluctuations exasperate it. This is why I hate pressed plugs of differing materials that expand at different rates vs upgrades that will absolutely secure them.

Point being, if a galley plug fails, it's likely to exit and drain a ton of oil, not just spew some oily misty spray about. Hopefully your seal fixes it. Please update after running it a bit.
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