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Old 02-04-2020, 03:48 PM   #1
35fordtn
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Default Mercury head gasket question

I have not run into this before... On a 1941?? Mercury engine.
It is a 3-3/16" bore, with the early type Water passage openings (triangle on top circle in middle and trapazoid shaped bottom one) Nobody makes this gasket. Can a 59A 46-48 gasket be used even though the water passage shapes are different?
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Old 02-04-2020, 04:11 PM   #2
JWL
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Default Re: Mercury head gasket question

Yes.
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Old 02-04-2020, 04:21 PM   #3
JSeery
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Default Re: Mercury head gasket question

Quote:
Originally Posted by 35fordtn View Post
I have not run into this before... On a 1941?? Mercury engine.
It is a 3-3/16" bore, with the early type Water passage openings (triangle on top circle in middle and trapazoid shaped bottom one) Nobody makes this gasket. Can a 59A 46-48 gasket be used even though the water passage shapes are different?
Not sure what the water passage shape/size has to do with the gasket openings? Most of the passages are way oversize to help in the removal of the casting core, the gasket controls the water flow.
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Old 02-04-2020, 04:24 PM   #4
Russ/40
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Default Re: Mercury head gasket question

I believe an 81A copper will work too.
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Old 02-04-2020, 04:36 PM   #5
35fordtn
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Default Re: Mercury head gasket question

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Originally Posted by JSeery View Post
Not sure what the water passage shape/size has to do with the gasket openings? Most of the passages are way oversize to help in the removal of the casting core, the gasket controls the water flow.
I assumed there would be no issue, but wanted to be sure I was not missing something.
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Old 02-04-2020, 04:39 PM   #6
JSeery
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Default Re: Mercury head gasket question

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Looks like the pro's have spoken (that's not me!) LOL.
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Old 02-05-2020, 03:15 AM   #7
34fivewindow
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Default Re: Mercury head gasket question

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Originally Posted by 35fordtn View Post
I have not run into this before... On a 1941?? Mercury engine.
It is a 3-3/16" bore, with the early type Water passage openings (triangle on top circle in middle and trapazoid shaped bottom one) Nobody makes this gasket. Can a 59A 46-48 gasket be used even though the water passage shapes are different?
Try this gasket its what i use on a 40 Mercury block, Fel-Pro # 7548 - B
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