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Old 04-07-2021, 06:05 AM   #1
36coupe
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Default How to repair damage to a deck

How can a flathead block deck be repaired? I have a gouge from a valve seat to the coolant port on the sealing area to repair about a 1/4 wide and a 1/32-1/16” deep.
JB weld would be too easy, I don’t think it would hold.
Can it be bronzed? A couple dabs with the mig and filed down? Would silver solder be too hot? I’ve repaired an exhaust manifold with a nickel rod on the arc welder but it was much thicker and I would be way to nervous to strike out an arc on the block.
Thanks
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Old 04-07-2021, 06:25 AM   #2
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Default Re: How to repair damage to a deck

I would like to see a picture.
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Old 04-07-2021, 07:36 AM   #3
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Default Re: How to repair damage to a deck

Not one of my better days. Fighting stuck valves.
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Old 04-07-2021, 07:41 AM   #4
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Default Re: How to repair damage to a deck

Damage
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Old 04-07-2021, 07:47 AM   #5
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Default Re: How to repair damage to a deck

JB Weld is supposed to be good for up tp 400 degrees F. However if the damage goes into the seat I would put a new insert in that seat. But I would reserve judgement until I could see a photo.
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Old 04-07-2021, 07:51 AM   #6
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Now that i've seen the photos. I would not be afraid to use JB weld, provided there is not a crack that goes deeper than the pictures show.
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Old 04-07-2021, 08:58 AM   #7
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Default Re: How to repair damage to a deck

Agreed JBWeld should work fine. A bit more substantial fix might be to paint the gouge with a tinplating solution. Then drip soft solder to fill the void. Jack E/NJ
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Old 04-07-2021, 08:59 AM   #8
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Default Re: How to repair damage to a deck

Quote:
Originally Posted by fordwife View Post
Now that i've seen the photos. I would not be afraid to use JB weld, provided there is not a crack that goes deeper than the pictures show.
No crack, self inflicted.
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Old 04-07-2021, 09:04 AM   #9
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Default Re: How to repair damage to a deck

Quote:
Originally Posted by Jack E/NJ View Post
Agreed JBWeld should work fine. A bit more substantial fix might be to paint the gouge with a tinplating solution. Then drip soft solder to fill the void. Jack E/NJ
Okay. I have a few different solders that melt at different temperatures from repairs to Indian gas tanks
I like the idea of solder
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Old 04-07-2021, 12:47 PM   #10
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Default Re: How to repair damage to a deck

I agree with Kay. My old eyes can't discern those unclear photos. Did you use the MACRO setting on your camera for clarity?
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Old 04-07-2021, 02:31 PM   #11
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Default Re: How to repair damage to a deck

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Old 04-07-2021, 02:33 PM   #12
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Default Re: How to repair damage to a deck



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Old 04-07-2021, 02:40 PM   #13
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Default Re: How to repair damage to a deck

You have to determine if the crack goes all the way down into the valve chamber before any method of repair can be done ( if possible)
Otherwise you are SOL.
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Old 04-07-2021, 03:35 PM   #14
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Default Re: How to repair damage to a deck

Quote:
Originally Posted by 51 MERC-CT View Post
You have to determine if the crack goes all the way down into the valve chamber before any method of repair can be done ( if possible)
Otherwise you are SOL.
It is not a crack, it’s a gouge caused by me.
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Old 04-07-2021, 04:08 PM   #15
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Default Re: How to repair damage to a deck

What caused that deep of a gouge? Chisel?
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Old 04-07-2021, 06:07 PM   #16
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Default Re: How to repair damage to a deck

I'm thinking epoxy won't take the heat in that area and will eventually fail. Silver solder doesn't work well for a filler. Brazing with bronze rod may be the best method to fill it without imparting too much heat and distortion. That's a tough spot, due to the uneven thickness and hole edge. Good preheat and slow cool will be the most important things for success.
Good luck!
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Old 04-07-2021, 09:02 PM   #17
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Default Re: How to repair damage to a deck

Quote:
Originally Posted by Doublepumper View Post
I'm thinking epoxy won't take the heat in that area and will eventually fail. Silver solder doesn't work well for a filler. Brazing with bronze rod may be the best method to fill it without imparting too much heat and distortion. That's a tough spot, due to the uneven thickness and hole edge. Good preheat and slow cool will be the most important things for success.
Good luck!
Okay thanks
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Old 04-07-2021, 09:03 PM   #18
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Default Re: How to repair damage to a deck

Quote:
Originally Posted by Tim Ayers View Post
What caused that deep of a gouge? Chisel?
Recep saw
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Old 04-07-2021, 09:27 PM   #19
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Default Re: How to repair damage to a deck

Solder or brazing likely better than JB weld. Although that is some tough stuff properly installed. Patched a lowerUnit on outboard Motor that lasted years in tough saltwater conditions.
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Old 04-07-2021, 09:31 PM   #20
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Default Re: How to repair damage to a deck

I would stitch it, from the water hole, to just inside the fire ring.
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