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Farmall & IHC Tractors Discussion Forum
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Piston Pin Bushings

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gfojtik

01-26-2007 06:08:36




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Does any one know what type of reamer is used to size piston pin bushings. I am working on a B farmall, and need to know if an adjustable reamer would do, or does it take a special reamer.




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randy hall

01-26-2007 09:28:29




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 Re: Piston Pin Bushings in reply to gfojtik, 01-26-2007 06:08:36  
follow everyone else's advice take them to a shop. they should be honed not reamed.



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Allan In NE

01-26-2007 10:29:40




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 Re: Piston Pin Bushings in reply to randy hall, 01-26-2007 09:28:29  
Got 'er backwards, Buddy.

They have to be reamed, not honed to .001" oil clearance. :>)

Allan



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randy hall

01-26-2007 16:26:17




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 Re: Piston Pin Bushings in reply to Allan In NE, 01-26-2007 10:29:40  
allan, .001 clearance would be maximum tolerance, already worn out.



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Bob

01-26-2007 16:04:04




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 Re: Piston Pin Bushings in reply to Allan In NE, 01-26-2007 10:29:40  
Allen, I guess there's not much use for pin bushing honing machines then????



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El Toro

01-26-2007 18:08:10




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 Re: Piston Pin Bushings in reply to Bob, 01-26-2007 16:04:04  
That's what our machine shop use's for bushings. Hal



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Allan In NE

01-26-2007 17:05:30




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 Re: Piston Pin Bushings in reply to Bob, 01-26-2007 16:04:04  
Yep,

That's the machine (or one like it) that the machine shops use. Each bit is a non-adjustable fixed sized reamer bit.

Why in the haties do they call it a hone? :>(

Allan



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El Toro

01-26-2007 18:11:13




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 Re: Piston Pin Bushings in reply to Allan In NE, 01-26-2007 17:05:30  
Hi Allan, Don't you remember the old wheel cylinder hones? They had stones too. Hal



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Bob

01-26-2007 18:04:47




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 Re: Piston Pin Bushings in reply to Allan In NE, 01-26-2007 17:05:30  
#1. The tool IS adjustable. Each covers a certain range, and they can be quickly changed. Some have foot pedal control of the expansion of the hone.

#2. The tool is a HONE. (As in "stones".)

I'm starting to think that cab project out in the cold is making you CONFUSED!

I had one of the things, and darned good Sunned, and lost it in a shop fire back in 1983. It's one machine tool I never have found an affordable replacement for!

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Allan In NE

01-26-2007 18:15:19




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 Re: Piston Pin Bushings in reply to Bob, 01-26-2007 18:04:47  
Oh no doubt about that.

I can't even remember what day it is most of the time. :>)

Allan



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randy hall

01-26-2007 17:31:56




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 Re: Piston Pin Bushings in reply to Allan In NE, 01-26-2007 17:05:30  
allan, a hone uses adjustable stone sets. a hone will give a much smoother a precise job than a reamer will. besides any motor shop that will do you a good job will fit each pin to a single rod.



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Allan In NE

01-26-2007 08:16:20




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 Re: Piston Pin Bushings in reply to gfojtik, 01-26-2007 06:08:36  
Take the rods and new pistons to the machine shop. This is one area where you don't want to mess around or you'll have one hammerin' engine.

They will check the rod for alingment and bore on both ends at the same time.

Allan



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Janicholson

01-26-2007 06:51:21




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 Re: Piston Pin Bushings in reply to gfojtik, 01-26-2007 06:08:36  
CNKS and El Toro are correct. The bushing is argueably the most precise fit in the moving parts of the engine. The systems used to fit pins use fixtures to align the rod with the crank journal end to make the bores parallel. This is not at all easy to set up on a bench with any reliability. You do not want your pistons running at an angle. JimN



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El Toro

01-26-2007 06:22:33




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 Re: Piston Pin Bushings in reply to gfojtik, 01-26-2007 06:08:36  
I think you should have bushings reamed at your local auto machine shop to fit the wrist pins. They can do it within .0001". Hal



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CNKS

01-26-2007 06:31:52




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 Re: Piston Pin Bushings in reply to El Toro, 01-26-2007 06:22:33  
Agreed--something as critical as that needs to be done right the first time.



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