DIY head surfacing after gasket failure - Page 2 - Snowblower Forum : Snow Blower Forums
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post #11 of 14 Old 01-02-2017, 07:57 PM
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Originally Posted by toroused View Post
For those who have done something like this before, about how much time did it take to wet sand the head in the article - 20 minutes, 30 minutes, an hour? Even more?

Also, as far as the directions stating to turn this thing periodically during the process, what is the best method - turning from say 6:00 to 9:00 then to 12:00 etc. in some type of specific, circular sequence?
ive done this to numerous ob motor heads, and there is no " how much time". a slightly warped head can be done in less than a half hour. a really twisted one may take close to 2 hrs. i do figure 8's and rotate the head 180 now and then...all depends on what you see on the mating surface.

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post #12 of 14 Old 01-02-2017, 08:38 PM Thread Starter
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The amount of time it takes would depend on how badly it's warped. You can always take a magic marker and color the surface before you start sanding to make sure you have it flat. Usually the sanding itself will make the metal look bright so it's pretty easy to see. I'd rotate it 90 degrees each time.

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post #13 of 14 Old 09-04-2017, 08:35 PM
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The amount of time it takes would depend on how badly it's warped. You can always take a magic marker and color the surface before you start sanding to make sure you have it flat. Usually the sanding itself will make the metal look bright so it's pretty easy to see. I'd rotate it 90 degrees each time.
that's how i mark mine. blue or black magic marker unless your lucky and have some machinist blue laying around to mark the surface
i also use lapping compound in place of sand paper using 3 grades course med fine to get a better surface,
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post #14 of 14 Old 09-05-2018, 10:24 AM
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Originally Posted by nwcove View Post
ive done this to numerous ob motor heads, and there is no " how much time". a slightly warped head can be done in less than a half hour. a really twisted one may take close to 2 hrs. i do figure 8's and rotate the head 180 now and then...all depends on what you see on the mating surface.
I'll second the figure 8 pattern. I do mechanical assembly and whenever we have to lap a part that is the recommended way.

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