mainshaft thread pattern
Thread Starter
|
Stage IV
Joined: Oct 2007
Posts: 4
Likes: 0
mainshaft thread pattern
Hello.1980 4-speed tranny.I messed up the threads on the mainshaft under the clutch hub nut. Looking to get a die to clean them up. I'm guessing 3/4 inch, 18 threads per inch, left-hand thread. But, I don't really know how to tell for certain. Can anyone help me get the info for ordering the Right one?
Thanks,
Pat
Thanks,
Pat
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
RE: mainshaft thread pattern
I dont know the size but you can measure it.
Measure the OD of the thread with a dial caliper or mic.Then measure the thread pitch with a pitch gage.
Or get yourself a set of jewelers files.You need to use one that is angled enough to to file the sides of the threads.
Or just replace.
Measure the OD of the thread with a dial caliper or mic.Then measure the thread pitch with a pitch gage.
Or get yourself a set of jewelers files.You need to use one that is angled enough to to file the sides of the threads.
Or just replace.
Thread Starter
|
Stage IV
Joined: Oct 2007
Posts: 4
Likes: 0
RE: mainshaft thread pattern
I've done that. I got confused reading an old machinists book which described "pitch" as the number of threads in the length of the circumfrence, i.e. wrap a paper around the bolt, mark it, then count the threads in that distance...
theOD of the threadsmic'd out, if I remember, at 0.72 or 0.73 inches diameter. pitch gage reads 18.
I'd file it, but it was a twelve point socket that some bonehead jammed on it, so there are a number of places. It's not bad enought to replace, though.the tranny is good.
Thanks. let me know if something(s) I said here don't seem reasonable, and I'll get the die.
theOD of the threadsmic'd out, if I remember, at 0.72 or 0.73 inches diameter. pitch gage reads 18.
I'd file it, but it was a twelve point socket that some bonehead jammed on it, so there are a number of places. It's not bad enought to replace, though.the tranny is good.
Thanks. let me know if something(s) I said here don't seem reasonable, and I'll get the die.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
RE: mainshaft thread pattern
.720/.730" dia sounds small.The size should be .7486/.7399". for a 3/4-18UNS externalthread according to the Machinist's handbook.
To double check,you can measure the ID of the nut.The minor dia. of the nut(ID) should be .690/.703".
You could also verify by checking the nut with a 3/4-18 bolt before you buy a die.
The pitch is the number of threads in 1 inch,has nothing to do with circumfrence.
I would try to file the thread to see if it is soft.If the shaft has been hardened then the die may not cut it.
To double check,you can measure the ID of the nut.The minor dia. of the nut(ID) should be .690/.703".
You could also verify by checking the nut with a 3/4-18 bolt before you buy a die.
The pitch is the number of threads in 1 inch,has nothing to do with circumfrence.
I would try to file the thread to see if it is soft.If the shaft has been hardened then the die may not cut it.
Road Master
Joined: Jul 2007
Posts: 1,009
Likes: 4
RE: mainshaft thread pattern
Go to a hardware store or an auto parts store and ask for a thread restoration file. It has a square shape and a different thread pitch per side. Be sure the file you buy has a thread pitch that matches the pitch you want to restore. Stroke the damaged threads as you go around the shaft untill the threads clean up enough to install the nut.
Thread Starter
|
Stage IV
Joined: Oct 2007
Posts: 4
Likes: 0
RE: mainshaft thread pattern
Ah, a thread restoration file. Never heard of the animal, but I like it. Thanks.
Trending Topics
Road Master
Joined: Jul 2007
Posts: 1,009
Likes: 4
RE: mainshaft thread pattern
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
anubisss
General Harley Davidson Chat
15
Apr 8, 2008 09:40 PM
