[SEL] Fairbanks Morse ZD Head Repair Information Needed

peter ogborne jopeter at omninet.net.au
Sun Sep 25 15:40:56 PDT 2005


Good idea John!
----- Original Message ----- 
From: "John Culp" <johnculp at chartertn.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Monday, September 26, 2005 2:01 AM
Subject: Re: [SEL] Fairbanks Morse ZD Head Repair Information Needed


>I had to remove some J-B Weld that had been applied to a cylinder wall 
> to fix wrist pin gouges and hadn't been properly smoothed down. It 
> looked good, but the high spots kept the rings from sealing. I got it 
> out with a propane torch, but I had to get it HOT before it weakened 
> and softened. Finally got chalky and could be chipped and brushed out. 
> I was starting to worry about cracking the cylinder wall with the 
> intense heat. When I replaced it afterward, I figured out a better way 
> of getting a really smooth, level surface. Instead of rolling the 
> surface of the fresh J-B Weld down smooth with something like a can (as 
> I'd seen recommended on here), I applied it, let it thicken up for a 
> few minutes, then took a piston ring, oiled it so the stuff wouldn't 
> stick to it, and pushed it straight down the bore with the lightly 
> oiled piston till it popped out the other end. Instant perfectly smooth 
> bore surface!
> 
> In a "hot" head with no water jackets, the J-B Weld might get hot 
> enough to break down. But I don't think it will in a combustion chamber 
> wall adjacent to cooling water.
> 
> John Culp
> Bristol, Tennessee, USA
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