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dirty oil Leak

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Old Mar 31, 2022 | 06:12 PM
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Mike Matthews's Avatar
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dirty oil Leak

Would I be looking at new rocker gaskets for this dirty looking oil sitting in here



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Old Mar 31, 2022 | 06:14 PM
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Re: dirty oil Leak

Is that oil or coolant? Maybe it’s the camera, but looks red like Dexcool.
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Old Mar 31, 2022 | 06:17 PM
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Re: dirty oil Leak

Originally Posted by TransamGTA350
Is that oil or coolant? Maybe it’s the camera, but looks red like Dexcool.
That's what I was wondering. Dexcool, or rusty. Not saying it is coolant, but in that location I'd be suspicious.
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Old Mar 31, 2022 | 06:18 PM
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Re: dirty oil Leak

I cleaned it of with a paper towel and sure looked like oil but yeah strange tint to it thats why I wasn't sure about it.
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Old Mar 31, 2022 | 06:19 PM
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Car: 1989 IROC-Z
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Re: dirty oil Leak

Does it taste like oil or coolant? It does look suspiciously coolantish.
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Old Mar 31, 2022 | 06:33 PM
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Re: dirty oil Leak

To me it looked more like rusty oil but maybe time to dig around to see where its coming from




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Old Mar 31, 2022 | 06:53 PM
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Transmission: T56
Axle/Gears: Borg Warner 3.70:1
Re: dirty oil Leak

The crust around the intake manifold to head connection looks a lot like dried coolant. Could be an intake gasket or thermostat gasket. Do you have dexcool (red/orange) coolant or plain old green?
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Old Mar 31, 2022 | 07:00 PM
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Re: dirty oil Leak

Originally Posted by TransamGTA350
The crust around the intake manifold to head connection looks a lot like dried coolant. Could be an intake gasket or thermostat gasket. Do you have dexcool (red/orange) coolant or plain old green?
Thats next job on the list to drain and flush the coolant as the header tank looks like the coolant aint been changed in a long while (it looks quite sludgy) , tho temps on the car have been fine and heater runs well
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Old Mar 31, 2022 | 07:23 PM
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Re: dirty oil Leak

You need to identify that fluid. If it's coolant, you've got a leaking thermostat gasket, or leaking intake manifold gasket. Would be a shame to do a flush, then flush again to replace the gaskets. A pressure test would tell you for sure, or get the engine to full hot and have a real close look.
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Old Mar 31, 2022 | 07:26 PM
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Re: dirty oil Leak

Originally Posted by Mike Matthews
Thats next job on the list to drain and flush the coolant as the header tank looks like the coolant aint been changed in a long while (it looks quite sludgy) , tho temps on the car have been fine and heater runs well
If your coolant is dark and sludgy, it needs to be flushed. If standard (green) and Dexcool (red) were mixed, it makes a brown sludgy mess. I would do a flush kit with straight water until you get it all out. Then, drain the radiator and block, fix the intake and thermostat gaskets (if that is in fact the leak), replace the thermostat and refill with 50/50 mix of coolant and distilled water.
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Old Apr 4, 2022 | 02:19 PM
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Re: dirty oil Leak

I get oil (100% verified it's oil) that pools up in the exact same spot. I've been told the intake manifold (or maybe the valley cover) isn't torqued on tight enough so the oil splashes up there under normal operation. I've never bothered fixing it in the four years I've owned my car, I just wipe it up every once in a while.
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Old Apr 4, 2022 | 05:28 PM
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Re: dirty oil Leak

Originally Posted by DoctorStoopid
I get oil (100% verified it's oil) that pools up in the exact same spot. I've been told the intake manifold (or maybe the valley cover) isn't torqued on tight enough so the oil splashes up there under normal operation. I've never bothered fixing it in the four years I've owned my car, I just wipe it up every once in a while.

Think you are dead right I aint had time to dig any deeper yet but what I wiped off was defiantly oil and I think it had a small amount in that place when I bought the car, since wiping it away nothing has come back yet so looks like a slow leak what ever it is. So a job for some time this summer.
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Old Apr 4, 2022 | 06:19 PM
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Re: dirty oil Leak

The Viscosity of that fluid tells me that I am not looking at Oil.

Also Dexcool dries and oxidizes in a particular way which looks like the Fluid in the Images.
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Old Apr 4, 2022 | 06:49 PM
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Re: dirty oil Leak

Yup. Looking at all that crusty GOOK around the coolant port of the intake manifold, somebody EFFFFFED UP and put Dex-Cool in it A LONG TIME AGO; and it's been oozing out of that gasket and around that bolt, as Dex-Cool always will since that kind of gasket is incapable of containing Dex-Cool, and some has been drying into that crust and some has been dripping off into that lovely pool.

Dex-Cool is GREAT stuff. I like it ALOT. Unfortunately however, its molecules are VERY small, and they go RIGHT THROUGH paper gaskets such as the 1955 design small block Chevy has, even more so than the water does. It's a SEVERE mismatch to these motors. Wonderful for a motor that's designed for it (aluminum-plate or plastic gaskets with silicone rubber O-rings, for example) around EVERY coolant port; UTTER FAIL for a motor with paper gaskets. Wrong application for the product.

My advice would be, remove the manifold and replace the gasket. Then CAREFULLY AND COMPLETELY drain & flush the radiator, the block by removing the thermostat and block drain plugs, and the heater core by removing the hoses and forcing water through it, to get EVERY TRACE of Dex out of everything; then fill it back up with DISTILLED water (NOT tap, NOT RO filtered) and old-skool green coolant, between 50/50 and 70/30 water to AF, depending on your location. Might also want to do away with those stoooooopid Torx head bolts, once you manage to get them out. I'd suggest regular hex-head stainless. 3/8"-16, 1¼" long. Lowe's has the best stainless collection among places of that general sort.
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