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Ford 9n Engine keeps droping sleeves into the pan

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Andyinpa

07-23-2006 18:56:33




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I have a ford 9n that used to run great. I had a cylinder sleeve drop into the pan. I had it replaced and another one dropped. I then had all of them replaced. I used the tractor for a few hour and noe another one dropped. Anyone have any ideas what might be wrong with my engine.




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TheOldHokie

07-24-2006 06:43:33




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 Re: Ford 9n Engine keeps droping sleeves into the in reply to Andyinpa, 07-23-2006 18:56:33  
First suggestion - new machinist. If not I assume he is performing all the aditional sleeve replacements for free at this point.

Sounds like the cylinder sleeve fitment to block bore is too loose. That's something the machinist should have observed and corrected the first time.

The block needs to be rebored and oversize sleeves installed. You could try the .005 oversize thin wall (.040) sleeve route but if it were me I'd have the block rebored for stock thicker walled (.090) sleeves and install them instead. The .090 sleeves have a slight lip on the top that fits into a counterbore on the top of the block and they cannot drop into the pan. The cost for reboring and installing the .090 sleeves when I rebuilt my 9n a few years ago was about $90.

There's nothing wrong with using sleeve retaining compounds for additional insurance. The manual says proper fitment is .001 interference and since nothing is ever exact in the machinist's world the unstated tolerance on that is probably +/- .0005. That's a demanding tolerance for even an experienced machinist with top notch boring equipment and most shops won't even try. They'll bore undersize and hand hone for final fitment. Sleeve retainers can increase the (-) side of that tolerance a bit but they are limited in how much looseness they can correct. They cannot repair excessively oversize bores caused by wear or a botched machining job.

YMMV,

TOH

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Kelly Jewell (KY)

07-23-2006 19:20:40




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 Re: Ford 9n Engine keeps droping sleeves into the in reply to Andyinpa, 07-23-2006 18:56:33  
Andy, it just a matter of someone doing it that knows what they are doing. And that is installing .005 oversize sleeves. They are available in the .040 thin sleeve as well as the .090 thick sleeve. Size the block with a CK-10 and your ready to install. Forget all about the stuff you hear about freezing and glueing. As my machine guy says, get the right size and when they go in right you know they will stay. Frozen or glued who knows.

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Joe(IN)

07-23-2006 19:10:10




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 Re: Ford 9n Engine keeps droping sleeves into the in reply to Andyinpa, 07-23-2006 18:56:33  
I would suppose that at some point it was honed during a rebuild and they took too much material out of the cylinders and now the sleeves aren"t as snug as they"re supposed to be. As for why they started dropping all of a sudden - who knows. And who cares? If the cylinder walls are intact and not cracked, it"s irrelavent. All that matters is how you fix it. You"ve got two choices and depending on what sleeves you"ve got in it, maybe only one. The first option assuming you still have the original thin wall sleeves is to order a set of the later thick wall iron sleeves, drop them off with your block at the machine shop, and have him overbore it for a press fit with the bigger sleeves. This would be a permanent and viable repair. The other option - and the only one if you"ve already got the thicker sleeves - is to use sleeve retainer compound on the sleeves when you put them back in.

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