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I love the FO-4 manual but ...

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OKRon

08-24-2002 19:13:58




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it doesn't list torque specifications for many (most?) bolts. The archives help for some specific bolts, and one kind person posted a link to a web page that probably had some sort of chart, but the link is no good any more. Since I am not a mechanic (aircraft or otherwise), I don't know what sort of reference manual I need to get that would list the specs for every combination of bolt (head size, thread size, and material) and mating material (cast iron, steel) that I might find on an N.

Can someone please help? It may be a bit much to ask if someone has actually compiled a list of torque specs for every fastener found on an N, but if someone has, could you please post it or post a link? I'll bet a lot of N owners would really like that.

Alternatively, does anyone know of a good reference source that charts bolts and torque specs in general. Preferably this would not be an all encompassing engineering manual, as such a manual would probably be pretty expensive considering all I am looking for is torque information.

Finally, (I'm trying to not have to ask this kind of question again), what is the torque spec for the six bolts that hold the clutch assembly to the flywheel?

Thanks

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bg

08-24-2002 20:26:24




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 Re: I love the FO-4 manual but ... in reply to OKRon, 08-24-2002 19:13:58  
here's a chart
torque chart



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Dell (WA)

08-24-2002 23:57:16




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 Re: Re: I love the FO-4 manual but ... in reply to bg, 08-24-2002 20:26:24  
Ron..... ...what bg said..... ...and..... ..

most of the time, tight is tight enuff. FO-4 generally lists ONLY the ones that really count. Like how tight do you have to bolt the fender bolt? Tight enuff, ok?

Most N-tractor nuts and bolts are fine thread and the most common sizes are 5/16, 7/16, 5/8 and would best be kinda classified as grade 6. So you really only have to memorize 3 common torque values..... .....Dell

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OKRon - Thanks bg and Dell, and one more question.

08-25-2002 06:48:37




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 Re: Re: Re: I love the FO-4 manual but ... in reply to Dell (WA), 08-24-2002 23:57:16  
Thanks for the good info. The clutch assembly bolts are kinda important because if think you got 'em tight enough and later find out you don't then you've got to split the tractor again. I also had only tightened the crankshaft pulley bolt to about 100 ft-lbs because the FO-4 manual doesn't mention it. Last night I found in the archives several people had asked how tight to tighten that bolt, and now I know I was loose by 50 ft-lbs.

Now about that crankshaft bolt... When I had the engine on a stand and the oil pan off I had a great way to hold the crank shaft so I could tighten that bolt as hard as I wanted (100 ft-lbs) without problem. Now that the engine is hanging from a hoist it isn't so easy. Dell, you mentioned in past responses that a person could put soft 1/4 inch clothesline in a sparkplug hole and turn the crank until the piston makes contact with the clothesline, then tighten the crankshaft bolt to the necessary 150 ft-lbs. Since the sparkplugs are lined up over the valves I expect I'll be trying to thread this clothesline over to the piston. Is there any chance that if I don't get it in the right place I could wedge this clothesline between a valve and the head and damage a valve, or is this nothing to worry about?

Thanks again.

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not a problem . . . Dell (WA)

08-25-2002 07:10:21




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 Re: Re: Re: Re: I love the FO-4 manual but ... in reply to OKRon - Thanks bg and Dell, and one more question., 08-25-2002 06:48:37  
Ron..... ...its nothing to worry about, the valves arn't really directly under the sparkie hole. Just stuff away. But if you really want to ease your mind, tie a knot in the other end of the rope so you can't stuff it all the way in..... ...Dell



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