8n cylinder sleeve in oil pan

Eric Gibby

New User
Bought a 1947 8n last week that the engine was making a slight knocking noise towards the top of #4 cylinder. It sounded about where the lifter is located and my initial thought was that the valve was way out of adjustment (if adjustable). According to the guy I bought it from, the engine was professionally rebuilt about 10-years ago and hadn't been used very much since. He said it started making the noise last year and they parked it and hadn't ran it since. I checked the valve adjustment (it does have adjustable lifters) and it was good. So I pulled the head to see what was going on inside. I found that there was no sleeve in #4 cylinder. The cylinder wall looks good with no scaring or evidence of wear. I pulled the oil pan and found the sleeve in pieces. Also, when I turned the crank with the head removed, the sleeve in #2 cylinder pushed out. Is this a common problem? Can I just replace the broken sleeve in #4? Are the sleeves a press fit or is there an adhesive that holds them in place. This is the first 8n that I have owned and am not familiar with them. Any help would be appreciated.
 
Mine was like that when I got it. I put a new sleeve in with sleeve retaining compound (Loctite 640, I believe). Slapped it all together and ran it for several years. 2 or 3 years ago another sleeve let go and I repeated the process. Been fine ever since.

I'm guessing it was honed at some point before new sleeves were installed and the fit just isn't as tight as it should be. The sleeve retaining compound is designed just for that situation.
 
I think I would replace the piston and rings on no.4 after you replace the sleeve. I probably didn't do it any good to flop around in no. 4 without the sleeve. I would get 2-3 tubes for sleeve retainer, whole tube on no. 4. You need to pull the other loose sleeve up as far a possible without passing the ring. If you pass the ring you have to pull the piston to reinstall. Check the other ones while there.
 
(quoted from post at 17:15:30 07/11/14) I think I would replace the piston and rings on no.4 after you replace the sleeve. I probably didn't do it any good to flop around in no. 4 without the sleeve. I would get 2-3 tubes for sleeve retainer, whole tube on no. 4. You need to pull the other loose sleeve up as far a possible without passing the ring. If you pass the ring you have to pull the piston to reinstall. Check the other ones while there.

Don't try to coat the entire sleeve with the retaining compound - that is a recipe for disaster. Put a ~1" wide band at the top of the sleeve and another ~1" wide band at the bottom of the bore in the block. Drive/press the sleeve in with a single "operation". If that doesn't hold it you have problems far greater than the retaining compound can handle. One "small" tube of compound will do 4 sleeves. More is not better and will only make the fix more difficult to execute..

TOH
 
I had sleeves installed in an 8N. They were the thick sleeves, 0.090. Shop said the the bore was a little over. So they installed over sized sleeves. I didn't ask how much over they were. But it appears they do make them.
 
Thanks for the information on a repair. Looks like a new sleeve, piston assy and some sleeve retainer needs to be bought.
 

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