Proper block prep for heads? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 22 (permalink) Old 04-16-2015, 10:42 PM Thread Starter
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Proper block prep for heads?

Short of pulling the motor and bringing it to a machine shop to check for flatness and then get it cleaned up, what is the best way to make sure there is no warping and clean it up in preparation for new head gaskets?
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post #2 of 22 (permalink) Old 04-16-2015, 11:18 PM
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Re: Proper block prep for heads?

I use a whetstone. Use as wide and as long as you can get and make sure it is fine. I also use them 2 at a time and use them to clean and resurface themselves. Mine are about 3" wide x 12" long.
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post #3 of 22 (permalink) Old 04-16-2015, 11:31 PM
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Re: Proper block prep for heads?

I use the green fiber 3M 2" discs.

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post #4 of 22 (permalink) Old 04-17-2015, 05:53 AM Thread Starter
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Re: Proper block prep for heads?

I've read that you don't want to take any metal off though, and both of those will take some metal off, correct?
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post #5 of 22 (permalink) Old 04-17-2015, 08:14 AM
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Re: Proper block prep for heads?

Yes. It takes a very small amount over a very large area when done right with a large stone. You see your high and low spots. That's the way I've done all my engines for the past 45 years without a problem.
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post #6 of 22 (permalink) Old 04-17-2015, 12:30 PM
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Re: Proper block prep for heads?

The key is the FIBER discs, not the brown cookies. The fiber discs are not aggressive and will only really remove gasket material from steel and cast iron. The brown cookies are much too aggressive for the block surface. Green fiber is for steel/iron and the yellow is for aluminum.

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post #7 of 22 (permalink) Old 04-17-2015, 02:39 PM
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Re: Proper block prep for heads?


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post #8 of 22 (permalink) Old 04-18-2015, 04:00 AM Thread Starter
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Re: Proper block prep for heads?

Great, now I'm hungry! lol

I'll have to see how affordable a wetstone that size is....or see if the machine shop I'm using has an alternative.
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post #9 of 22 (permalink) Old 04-19-2015, 01:36 AM
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Re: Proper block prep for heads?

Quote:
Originally Posted by lenzhotrod View Post
I use a whetstone. Use as wide and as long as you can get and make sure it is fine. I also use them 2 at a time and use them to clean and resurface themselves. Mine are about 3" wide x 12" long.
What is the "grit" size of whetstone that you use ? Are there different grades ?
Does this procedure shed any grindings ? I'm not used to performing a job like
this without complete disassembly for cleanliness purposes . Any special tricks
to stop debris from getting the bores etc. ?
Any details would be appreciated and I'll take 45 years of experience any day .

Thanks
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post #10 of 22 (permalink) Old 04-19-2015, 03:31 AM
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Re: Proper block prep for heads?

Mine are like a 600-800 grit. I use a crosshatch pattern and lint free rags for clean up. Go in one direction, then when it is all clean cross and go in a second direction. This will show any high or low spots. I use 2 stones to keep the surfaces flat and clean by rubbing them together.
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