Diamond Block Valve Chamber Damage
 

I am in the process of rebuilding a diamond block motor that we found on a farm in northern Okla. Other than me snapping a head stud everything other than this damage to the valve chamber makes this a good block. It is a 20 over block that I will take to 40 if this damage does not make it unusable. This tunnel feeds the front of the block but because the oil flow not pumped to the front of the motor as long as the tunnel is clear will it be ok. Trust me it looks much better after we have started to clean it up.

Re: Valve Chamber Damage
 

Being a novice with these motors, and it having been over a year ago when I did my motor, I don't know the function of that tunnel, but as to repair, a sheet metal patch could be JB welded over that area, and it would be fine. There is no high oil pressure to worry about.

Re: Valve Chamber Damage
 

Silver solder will work fine...
As for JB weld, I wouldn't put anything in there that has a chance of coming loose
and getting in the oil or mechanical parts. Instant death.

Re: Diamond Block Valve Chamber Damage
 

The problem with welding or solder is making sure the tunnel stays open, so put a piece of metal over the hole first, and solder in place. I've had good luck with JB weld.

Re: Diamond Block Valve Chamber Damage
 

You know our first thought was to cut a piece of copper tube in half and lay over the damaged area and then braze it. I am just trying to make sure the logic is sound.

Re: Diamond Block Valve Chamber Damage
 

Jim,
Why not remove part of the dam in the front(above the front cam journal), drill
out the oil line, replace the oil line and the dam. No welding...less BS..

Re: Diamond Block Valve Chamber Damage
 

Wonder how much would be left after an acid dip. A blocks are not worth enough to make dealing with any damage a good plan. It is a matter of confidence. I try to use good parts, not patch stuff that is arguably scrap. How long have we been this desperate? Good Luck: Fred A

Re: Diamond Block Valve Chamber Damage
 

Not desperate just trying to not have to repour the mains as they are in great shape. I would have hot tanked it but for that reason. This is going to be a spare motor for the shop.

Re: Diamond Block Valve Chamber Damage
 

I am up for D.J.'s repair, just sleeve it and be done with it. That's how I'd do it.