Is it worth it?

Hi folks,

I've been working for a bit at overhauling an engine out of a 2N. The original block was cracked on between the intake valves and cylinders on #2 & #3, so I scrapped it out and bought a used block from eBay. After it came back from the machine shop (hot tank/Magnaflux and line bore for a new oil pump housing) I went to start assembling and found that the sleeves drop in the cylinders with a slip fit (.040" thin wall sleeves) and the valve guides fit loosely in the block. I bought the full overhaul kit from this site. I can possibly get oversize sleeves, or even have the cylinders bored out to accept .090" sleeves, but I'm not sure what to do about the loose fit of the valve guides. But at this point, is it worth it?
 
Too bad you have all these obstacles to overcome. Hopefully you'll get forum advice as to the best course of action.

My rule of thumb regarding rebuilding:
The elderly machinists whose every bit of instruction I devoured when I was in my late 20's, put this bug in my ear; they said, "the engine that is your optimal choice for the best chance of a perfect rebuild that can last as long as the new motor, is a block that has never been rebuilt before."

But that's not to say that if I already owned an engine like in my NAA that needed rebuilding, I wouldn't give it a go.

Good luck,
Terry

P.S.
One engine that was notorious for blowing head gaskets between #2 and #3 cylinders, if a perfect valve job wasn't done, were the OHV Austin 1100 and 1200 engines, because the narrowest casting in the block was between 2 & 3. That all changed with the 1500 engines, which is where my only interest in Austins begins. In a 1500, the widest space is between 2 & 3. Great little industrial engines and I contemplated trying to put one in my Oliver crawler.

mvphoto11606.jpg
 
The valve guides do not need to be a press fit. The intake valve guides will have a seal on them and the exhaust guides should be fine unless they are so loose they wobble around in the bore.

Mark
 
As mhb stated, valve guides are not an interference fit. Use valve seals on intake valves only.

Sleeves should be an interference fit.

If .040 sleeves do not fit properly, do what most folks do and bore the block for .090 sleeves.

Your machinist will love you as most machinists do not want to install .040 steel sleeves.

Dean
 

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