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Old 03-08-2019, 11:51 AM
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High spot on engine block

After weather delays Iím going back in to reinstall my cylinder head and found what may be a problem/source of my gasket failure. I found about a dimed sized high spot on the top of the block. Itís noticeable enough to feel just running my finger over it. Iím certain itís tall enough to cause a gasket sealing problem.

The block is in the car and I have no intention of pulling it. Is there a method to rub it down?


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Old 03-08-2019, 11:58 AM
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I'm sure there is a method to achieve what you want like using a knife sharpening stone. I would search YouTube for examples. Probably use some blue dye to determine progress.

I would probably secure some thin metal shim on the sides of the high spirits and use a stone to shave it down to the level of the shims then remove the shims to finish the job.

Just an educated guess of what would be done. I would try to find some YouTube videos first.
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Old 03-08-2019, 12:12 PM
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I don't know how that could happen since the block is faced when built. I would set the head on the block without the gasket and verify there is a gap with feeler gauges or use a dial gauge to measure how bad it is. Might correct the problem if there is a thicker head gasket available. If it needs to be corrected I would have it done by a professional. If you go too far it will be a much bigger issue. Was there always a problem with the head gasket or was it OK at one time?
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Old 03-08-2019, 12:26 PM
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Donít know the answer, when I acquired it the gasket was bad. Iím going to re-examine it later today, hoping it was mostly my imagination. I will be installing a 1.0 mm headgasket when the weather warms up.


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Old 03-08-2019, 12:27 PM
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High spot on engine block

How it got there? I would suspect corrosion from interaction with the coolant or oil that was leaking through the gasket. Aluminum will definitely swell when corrosion takes root.

The concern is: if you try to remove the bump will you create a pit? Is the bump basically a big flake about to peel off and leave a big hole?
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Old 03-08-2019, 12:29 PM
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Quote:
Originally Posted by andrewwynn View Post
How it got there? I would suspect corrosion from interaction with the coolant or oil that was leaking through the gasket. Aluminum will definitely swell when corrosion takes root.

The concern is: if you try to remove the bump will you create a pit? Is the bump basically a big flake about to peel off and leave a bif hole?


I should take a closer look before I post. Needs to be about 10 degrees warmer and damned if itís not sprinkling rain again.


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Old 03-08-2019, 01:09 PM
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Quote:
Originally Posted by andrewwynn View Post
How it got there? I would suspect corrosion from interaction with the coolant or oil that was leaking through the gasket. Aluminum will definitely swell when corrosion takes root.

The concern is: if you try to remove the bump will you create a pit? Is the bump basically a big flake about to peel off and leave a big hole?
Coolant has additives to protect from corrosion. Water by itself can corrode aluminum but it is very weak agent. Oil prevents corrosion. Aluminum blocks are an alloy that are less prone to any type of corrosive agent. Regardless, corrosion deteriorates the surface, pitting the aluminum creating a low spot rather than a high spot.
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Old 03-08-2019, 01:31 PM
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You should get a dial indicator on it and find out just how tall the bump is. You may be able to feel it, but I've found fingers can be quite sensitive to small height differences depending on conditions. It may feel worse than it really is.
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Old 03-08-2019, 01:33 PM
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Hopefully it's not a plug that was used to repair a crack.
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Old 03-08-2019, 05:12 PM
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Quote:
Originally Posted by Fifty150hs View Post
You should get a dial indicator on it and find out just how tall the bump is. You may be able to feel it, but I've found fingers can be quite sensitive to small height differences depending on conditions. It may feel worse than it really is.
Fingers can feel very small height differences. Nanometers, thousandths of millimeters. Thatís far smaller than would give problems for a gasket.

https://www.sciencedaily.com/release...0916110853.htm
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