4020D Sleeve O-ring Pitting

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In-Frame rebuild time for this 1966 4020 Diesel Powershift. Block R33180. After cleaning out the cylinder wells, there is some pitting at the o-ring seat. This is #5 cylinder. 2,3,4 are showing the beginning signs of this pitting.

I am the second owner of this, the first being my father in-law. Estimated hrs (clocked stopped at 8600 in 71 or 72) >20k. No major rebuilds or anything. There was a healthy buildup of sludge in the bottom of the wells. No obvious weephole stains/leaks or general coolant leaks for the time I have had it (250 hrs over 12 years).

Some posts here and there say that a JBWeld fix is the way to go. Others would send it to the machine shop. Get a new block or take a chance on putting it back together again round out the option tree.

I appeal to the great Deere engine rebuilders and eye-ballers here for your advice on the most prudent path forward.

Thx.[/url]
 
Never done a 4020. Done many an IH and Cummins that were way worse than that and I just cleaned with a s scotch bright wheel and put them together. Never had one fail.
 
I posted this in the proper place and I have a few responses to the same effect. It seems pretty pitted up to me, but I only have 1 data point and that is this one. Thx!
 
Years ago I was overhauling one of my Oliver 1850's and the pitting in the bottom bore looked bad to me. I talked to the Oliver dealer and he said they used Bondo on them. Said he had received a bulletin from Oliver to us Bondo to do so. That is what I used.
 
When I first started looking into this, I thought of using JB or epoxy or some other thing. After 3 seconds of thinking about it, I told myself "no way".

Then I posted the prob here and viola, the most popular response has been clean it, fill it, and stuff everything back together.
 
I have used a product call Lab metal made by Devcon . And it machines like cast iron . we had that same problem on a Oil All over 310 block and this one was bad big time . a neighbor worked for Deming pump and said that is what they used on bad pump castings . We had the block out and we sand blasted the areas we were to fix and smeared it in and nothing fancy about the way we did this. Then we took the boring bar to it 24 hours later and it machined like cast iron and finished like cast . Fixed that problem nicely .
 

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