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Old 09-02-2005, 11:22 PM   #1
Mike1967
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Default Does this look like a blown head gasket ?

I have pulled both my heads tonight to inspect for a suspected blown gasket. Unfortunately I have no idea what a blown head gasket looks like. Hoping somebody who knows what to look for can give me some feedback on the following photo's.

Thanks in advance for your help !!!

--------------------------------------------

This is the left side head just removed from the block with the gasket still intact.



Another photo of the head with the gasket removed



Here is a closeup of the area that I think was the culprit of my overheating problem. This is a closeup of the head with the gasket still installed.



---------------------------------------------
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Last edited by Mike1967; 09-02-2005 at 11:32 PM.
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Old 09-03-2005, 09:37 AM   #2
kheff46
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pics are hard to see on my comp. mike. can you lighten them somehow? might help someone else spot the same culprit!-keith
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Old 09-03-2005, 09:43 AM   #3
Storm
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It seems reasonable that the area you highlighted is where the gasket failed. Sometimes you can't exactly see where it happened. Check the surface of the head for flatness. No coolant got into the combustion chambers.....they would be steamcleaned in appearance.

Jay Storm
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Old 09-03-2005, 10:19 AM   #4
Mike1967
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Quote:
Originally Posted by Storm
It seems reasonable that the area you highlighted is where the gasket failed. Sometimes you can't exactly see where it happened. Check the surface of the head for flatness. No coolant got into the combustion chambers.....they would be steamcleaned in appearance.

Jay Storm
Jay

Yes, it appeared that the oil was getting into the coolant rather than the coolant getting into the oil. (this dialogue is reminding me of an old reeses candy commercial )


I did walk across both heads with a straight edge and feeler gauges after thoroughly cleaning the heads with a putty knife. Not 100% confident of my findings....but I saw warp as high as .005"......002" is where it should be.

The worst area (.005") was in the area of the head that I suspected from the photo's above.

I am going to get the heads pressure checked and milled next week. There are no machine shops open currently due to labor day weekend.....so work is halted until I get the heads checked out.

Do either of you guys know what the max amount of thickness that can be milled off the head surface ?
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Old 09-03-2005, 11:19 AM   #5
t3hWIT
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pretty
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Old 09-03-2005, 11:57 AM   #6
2003Baja
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sorry to hear about you problem. here is a slightly rendered pic to help people out.
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Old 09-03-2005, 01:10 PM   #7
Lethargic1
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Quote:
Originally Posted by Mike1967
Jay

Yes, it appeared that the oil was getting into the coolant rather than the coolant getting into the oil. (this dialogue is reminding me of an old reeses candy commercial )


I did walk across both heads with a straight edge and feeler gauges after thoroughly cleaning the heads with a putty knife. Not 100% confident of my findings....but I saw warp as high as .005"......002" is where it should be.

The worst area (.005") was in the area of the head that I suspected from the photo's above.

I am going to get the heads pressure checked and milled next week. There are no machine shops open currently due to labor day weekend.....so work is halted until I get the heads checked out.

Do either of you guys know what the max amount of thickness that can be milled off the head surface ?
This seems as good a time as any to learn something. What exactly was warped .005"? Where is the measurement taken from?
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Old 09-03-2005, 01:19 PM   #8
Kawikid20o2
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Mike just out of curiosity what engine are we looking at? even though its hurting right now, its closed deck is pretty sexy!
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Old 09-04-2005, 12:59 PM   #9
Mike1967
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Quote:
Originally Posted by Kawikid20o2
Mike just out of curiosity what engine are we looking at? even though its hurting right now, its closed deck is pretty sexy!
This is a 2.5 SOHC
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Old 09-04-2005, 01:07 PM   #10
Mike1967
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Quote:
Originally Posted by Lethargic1
This seems as good a time as any to learn something. What exactly waswarped .005"? Where is the measurement taken from?

You take a straight edge and put it against the surface of the head. You then take a feeler gauge and try and slide it between the surface of the straight edge and the head surface.

You run the feeler gauge all along the length of the straight edge to test for warpage along the length of the head that is under the straight edge.

I took two diagonals and I took perpendiculars. I did about 6 perpendiculars by walking it down the face of the head from left to right.

The feeler gauge I bought has about 50 gauges of varying thicknesses. In many places I was able to get a .004" feeler gauge to clear between the bottom of the straight edge and the top of the head. In otherwords, in some places there was a gap of .004" between the straight edge and the head surface. This gap is defined as warp.

The worst place I located was warped at .005".

The maximum warp in .002" +/- .0002. So I exceeded the max warp by X2 on some area's of the head.

Now...having said this....taking measurement with a straight edge and feeler gauge is probably not an exact science....but I am very confident that I have excess warp which requires that the heads be milled.

I am taking these into a reputable machine shop next week to be pressure tested for cracks and to be milled.
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Old 09-04-2005, 01:25 PM   #11
Lethargic1
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Default

Quote:
Originally Posted by Mike1967
You take a straight edge and put it against the surface of the head. You then take a feeler gauge and try and slide it between the surface of the straight edge and the head surface.

You run the feeler gauge all along the length of the straight edge to test for warpage along the length of the head that is under the straight edge.

I took two diagonals and I took perpendiculars. I did about 6 perpendiculars by walking it down the face of the head from left to right.

The feeler gauge I bought has about 50 gauges of varying thicknesses. In many places I was able to get a .004" feeler gauge to clear between the bottom of the straight edge and the top of the head. In otherwords, in some places there was a gap of .004" between the straight edge and the head surface. This gap is defined as warp.

The worst place I located was warped at .005".

The maximum warp in .002" +/- .0002. So I exceeded the max warp by X2 on some area's of the head.

Now...having said this....taking measurement with a straight edge and feeler gauge is probably not an exact science....but I am very confident that I have excess warp which requires that the heads be milled.

I am taking these into a reputable machine shop next week to be pressure tested for cracks and to be milled.
Ok, thanks for the response. I think I understand it a little better now.
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