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Old 11-08-2017, 09:16 PM   #1
Chrisohki
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Default Cracked head?

I bought a 96 SC and was told it had a cracked head. When I asked how they knew the answer I got was it was spraying oil out right above the AC compressor.

I decided I could either swap the head or the engine.

I checked the oil and it shows no signs of coolant in the oil, and I don't see any oil in the coolant so...

My question is, is there any thing else that would cause the oil to spray out?

I tried to look up some of the possibilities but really haven't come across anything solid.

I figured I would ask before I tore apart half an engine.

Thanks

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Old 11-08-2017, 09:22 PM   #2
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Default Re: Cracked head?

Spraying out?
Maybe the previous owner was guessing, or mistaken or correct?

I doubt that if the AC compressor were damaged somehow, that even that would not cause it to spray out PAG oil and appear to come from the engine head.

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Old 11-08-2017, 09:28 PM   #3
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Default Re: Cracked head?

The quote he used was "it sprays out right there" pointing just above the AC bracket, which was followed with it dumps out oil about as fast as you can pour it in.

The Exhaust manifold is coated in engine oil as well as most of the right side of the engine.

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Old 11-08-2017, 09:30 PM   #4
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Default Re: Cracked head?

Quote:
Originally Posted by Chrisohki View Post
I bought a 96 SC and was told it had a cracked head. When I asked how they knew the answer I got was it was spraying oil out right above the AC compressor.

I decided I could either swap the head or the engine.

I checked the oil and it shows no signs of coolant in the oil, and I don't see any oil in the coolant so...

My question is, is there any thing else that would cause the oil to spray out?

I tried to look up some of the possibilities but really haven't come across anything solid.

I figured I would ask before I tore apart half an engine.

Thanks
There is an oil gallery that runs along the head on the exhaust side above the exhaust manifold and over torquing those A/C bracket bolts can cause it to crack or overheating severely will do it. Usually it cracks between #3 and #4 ports. If it is over to the right it is an over torqued A/C bracket and the only fix is a new head. Fill the oil to normal level and start it up and watch and see if there is a leak-spray.

From your description the gallery is cracked.

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Old 11-08-2017, 09:33 PM   #5
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Default Re: Cracked head?

This is what is involved in a head swap. Do not deviate from the steps for chain remove-replace. Head replacement and chain remove-replace
http://www.saturnfans.com/forums/sho...d.php?t=168496

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Old 11-08-2017, 10:01 PM   #6
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Default Re: Cracked head?

Thanks for the info.
I removed the valve cover and the AC bracket. I'll do most of the tear down tomorrow.

I'll post pictures as I go,

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Old 11-08-2017, 10:36 PM   #7
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Default Re: Cracked head?

Forgot to mention the plug on 1 was filled with oil as well,

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Old 11-08-2017, 11:09 PM   #8
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Default Re: Cracked head?

That may be nothing but a cam cover leak.

The definitive test is to fire it up and look. The gallery is that rounded bulge above the exhaust ports.

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Old 11-09-2017, 11:28 AM   #9
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Default Re: Cracked head?

Quote:
Originally Posted by OldNuc View Post
From your description the gallery is cracked.
My first thought was that it might be a cam cover crack, but that wouldn't be a "spray" "as fast as you can pour it in" kind of thing, whereas the oil gallery would be pressurized.

I'm gonna guess the answer is, "no" since you didn't suggest it, OldNuc, and because of its location, but is this something that could be welded in situ by a talented person?

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Old 11-09-2017, 12:16 PM   #10
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Default Re: Cracked head?

Almost need to pull the motor to get access to it, and being aluminum of virtually unknown mixture it's nearly impossible to weld even when you get decent access to it. If someone knows or can figure out the aluminum mixture then there's probably a comparable stick that can be used, but it's bound to restrict the oil gallery and possibly cause oil-pressure issues.

I'm not convinced it's from over-torquing the A/C bracket to the head, but it's defiantly related to the A/C bracket. Probably more from being hauled out of the car on the "inboard" side of the A/C unit rather than the proper "outboard" (timing cover) side...the single motor I've had this issue on was sourced by someone else and bought from a JY. IMO, I've pulled & installed too many motors before that with 0 issue for the lone broken one, not pulled by me, to be my fault...

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Old 11-09-2017, 12:25 PM   #11
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Default Re: Cracked head?

step 1; find the source of the leak

Highmile
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Old 11-09-2017, 01:00 PM   #12
Chrisohki
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Default Re: Cracked head?

Well I started to clean more today and I did find the crack.

I would post a pic but I can't link or post pics yet. It's to the right of the AC mount. I'm going to move on and replace the head.

Fun times ahead.

Thanks for the info.

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Old 11-09-2017, 02:53 PM   #13
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Default Re: Cracked head?

The cost to attempt a weld repair will exceed the cost of a JY head and the proper head rebuild.

The gallery crack also extends into the head proper, it is not confined to just the external gallery area. Sometimes you also get a coolant leak. As to how it happens carefully look at that A/C bracket mounting along with the compressor and it becomes obvious. If the timing cover has ever been off then all of the A/C bolts have been out and back in. It is remotely possible it is a timing cover crack but the mess is too large and the original owner description leads to a pressurized source. There have been several cases of that identical failure in that area. If you are interested careful google searching of this site will find them.

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Old 11-09-2017, 03:51 PM   #14
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Default Re: Cracked head?

drive.google.com/file/d/1YfI7RCbwiWQToYKfJJayiEw2kVKvEPuU/view?usp=drivesdk

drive.google.com/file/d/1WAJ2mIpuFGWYD7ofmf61FF2DdPPJT6eN/view?usp=drivesdk

Google drive image link of the crack

You'll have to copy and paste it.

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Old 11-09-2017, 04:16 PM   #15
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Default Re: Cracked head?

https://drive.google.com/file/d/1YfI...2kVKvEPuU/view

https://drive.google.com/file/d/1WAJ...DdPPJT6eN/view


Direct links to crack pictures.

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Old 11-09-2017, 04:44 PM   #16
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Sad Re: Cracked head?

Thanks! I can't post links yet

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Old 11-09-2017, 07:35 PM   #17
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Default Re: Cracked head?

Its nice that the previous owner was honest about the car needing a new head and not giving out that it could be fixed with like JB Weld (which can't help).

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Old 11-09-2017, 07:37 PM   #18
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Default Re: Cracked head?

Agree! The guy was pretty straight forward with me about the car.

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Old 11-09-2017, 07:48 PM   #19
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Default Re: Cracked head?

A head swap can be done with the engine in the car but it is a PITA compared to pulling it out. If a manual you pull both engine and trans but an auto you can pull just the engine.

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Old 11-09-2017, 09:45 PM   #20
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Default Re: Cracked head?

Quote:
Fun times ahead.
Fun is why we are here! A full rebuild is a lot of fun.

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