Ironhead ‘72 IH…early or late ‘72?

[NP72Iron]

Thanks [mention]DR DICK [/mention]!


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[NP72Iron]

Originally Posted by DR DICK

see #45 in your pic.
on the gear there is a recess that washer fits into.


depth of that recess is appx 1/16" for the early gear. uses the -52 bush. uses one of #45 washer.



depth of recess is appx 1/8" for late gear. uses the -72 bush. if you have this gear you use two #45 washer stacked up.

Hey [mention]DR DICK [/mention], I’m looking at the #45 washers and there are 4 different thicknesses. As I have the late gear, would I be using two of the 0.065” washers?
Thanks again!


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[sungod]

Originally Posted by NP72Iron

Hey [mention]DR DICK [/mention], I’m looking at the #45 washers and there are 4 different thicknesses. As I have the late gear, would I be using two of the 0.065” washers?
Thanks again!

So using two 0.065 washers gives you .130 -.125 = +.005 proud.
Still need to install tranny and check endplay.
Spec in FSM .004-.009
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[NP72Iron]

Thanks [mention]sungod [/mention]!


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[needspeed]

Originally Posted by NP72Iron

... As I have the late gear, would I be using two of the 0.065” washers?..

Maybe, maybe not.

You use whatever combination of two #45 washers is needed to give the right spacing between countershaft 1st and the gear next to it. (countershaft 3rd). The manual spec is .038 to .058". The final position of countershaft 3rd needs to be established first.

There's good info in this sticky "transmission assembly, tutorial w/pics"
http://xlforum.net/forums/showthread.php?t=657134

The 4th pic at page 2 shows the 1st gear to 3rd gear spacing being measured with a feeler gauge. The next pic shows the #45 washers. Thickness needed will vary from one bike to another.

[NP72Iron]

Originally Posted by needspeed

Maybe, maybe not.

You use whatever combination of two #45 washers is needed to give the right spacing between countershaft 1st and the gear next to it. (countershaft 3rd). The manual spec is .038 to .058". The final position of countershaft 3rd needs to be established first.

There's good info in this sticky "transmission assembly, tutorial w/pics"
http://xlforum.net/forums/showthread.php?t=657134

The 4th pic at page 2 shows the 1st gear to 3rd gear spacing being measured with a feeler gauge. The next pic shows the #45 washers. Thickness needed will vary from one bike to another.

I’m preparing to put the trans together and the above tutorial is great.
I’m just wondering if I can measure clearances without the thrust washers and then figure out which I need? I’m trying to avoid buying a bunch of different size washers that aren’t needed, if at all possible. The washers themselves are pretty darn cheap, but shipping costs the same if not more than the part itself. Costs if this build are adding up and I’m trying to keep them as low as possible.
Or is how I described above the proper way to do it?!


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