Block salvage Corrosion on machine surfaces

B

Bluebell

Well-known member
I have a C69a block that was salvaged from a paddock. It has passed a crack test, but is badly corroded on the water pump mounting face and on the face at the back of the block where the cover for the idler gear mounts.
Has any body faced these surfaces or has any body had success in repairing them?
 
Have never had any that were so bad that an application of the appropriate
gasket sealer did not address the problem.
 
Can the block be blasted and filled with j-b weld? the w/p mount surface It may work, as for the oil pump Idler may be a bit questionable, I have repaired Cat Diesel blocks and a few flatheads with the epoxy , I use a specific process for most of the water jacket and some pressure areas, It just depends on the extent of the damage and ability to prep the surfaces for adhesion, I have run an 8.B.A for over 30 plus years with a J.B repaired water jacket.
good luck.
Fordestes
 
Likewise, I had a '35 21 stud that had been rebuilt using JB Weld to fill extensive corrosion on the deck surfaces. Ran great; only problem was it tended to run hot under heavy throttle at freeway speeds when climbing a grade, I think because JB Weld doesn't transfer heat as well as metal. Other than that, it was a fine running engine.
 
I do the spray bond from time to time it is a good fix if done properly, I use a powder torch with nickel powder, only problem is with the spray torch build up the block needs to
be heated in an oven, I have used this process on hard to find F.E heads and ancient
tractor parts, last time I bought powder is was 100.00 per pound, Pete mentioned wire build up. Pete will you share the how to about the wire process? I never seen it done to cast iron blocks, I used to use a type of mig wire spray on steel shafts. it would be good to know about.
 
Fordestes said:
I do the spray bond from time to time it is a good fix if done properly, I use a powder torch with nickel powder, only problem is with the spray torch build up the block needs to
be heated in an oven, I have used this process on hard to find F.E heads and ancient
tractor parts, last time I bought powder is was 100.00 per pound, Pete mentioned wire build up. Pete will you share the how to about the wire process? I never seen it done to cast iron blocks, I used to use a type of mig wire spray on steel shafts. it would be good to know about.
Click to expand...

Here is a pretty good description of the process.
https://en.wikipedia.org/wiki/Thermal_spraying
 
The processes described are probably overkill for the two surfaces you describe. A little bit of jb weld and it'll be fine. Obviously clean it really well first and assemble up with new gaskets and some sort of sealant to give it the best chance.

Mart.
 
Thanks Pete,
I didn't realize there are so many methods available to build up quite an array of materials, I am amazed to learn of the plethora of technology we have in this modern world.
Fordestes
 
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