Thread size question

[smittykid]

I have a Leakless water pump from Snyder's-the sealed unit no lube. I needed to remove the fan (alum 2 blade) to grind down the end of the housing for a little more pulley clearance. When I smacked the fan removal tool with a hammer, it wasn't on straight and boogered up the threads at the very end of the shaft. The castle nut will start, but I'm afraid to force it in fear of stripping the rest of the threads. What size die do I need to clean up those threads at the tip?

[noboD]

It sounds like you need a thread file instead of a die. Many times a die will not start on a boogered thread. The file is about $5.00 and will do several different pitches. I have fixed lots of threads with a thread file, google it. I don't have one of those pumps so I can't tell you the pitch.

[slammin]

The tread file is a better solution. If you decide to use a die, make sure the die is an adjustable die. They are split and have a set screw to expand the size so you just clean the threads without changing the pitch diameter, making sure the die is square to the axis of the stud. Take the nut to the hardware store and find a bolt that it fits.

[Rex_A_Lott]

X2 on the thread file, it's a very handy tool to have. One thing you can do is to check it with a tap. Lay it alongside the shaft and when you find one that the threads nest perfectly , then you know what size die to use. Good luck.

[BILL WILLIAMSON]

Even CHEAP tap & die sets have a THREAD GAUGE, to measure the thread PITCH!
Bill W.

[John Stone]

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Thread size is 7/16X20

[Afordman31]

Some Pictures

[Afordman31]

From John Stone's reply you will need a file that has a 20 thread size marked on it. The 20 thread size is a fine thread.
These files come in National Course, Fine , and Metric thread. Hope this helps!

[BILL WILLIAMSON]

Threads were a MARVELOUS invention, just spend some time "pondering" THREADS & you'll be awake HALF the NIGHT!
Bill Easilymystified

[Terry, NJ]

As a former Tool And Diemaker, I have! In fact, I collect taps and dies in sizes I'll never use (1/4 x 24, 1/4 X 40, 3/8 X20, !/2 X 24, 9/32/ 24 etc) just because I like collecting them as I come across them. Weird, I know!
Terry

Originally Posted by BILL WILLIAMSON

Threads were a MARVELOUS invention, just spend some time "pondering" THREADS & you'll be awake HALF the NIGHT!
Bill Easilymystified

[mike657894]

I bought a motorcycle with a hammered end on a fly wheel thread. I used a needle file to clean out the end crank thread that was hammered. You only get to do one groove at a time but it was easy to make it look like it never happened.

these are the kind of needle files i use. I originally bought them to do some free form checkering on grip. but have found so many uses for them since. https://www.amazon.com/TEKTON-6655-N...s=needle+files

[smittykid]

Thanks guys! I bought a thread file from NAPA. After working with the thread file and a small flat file, I got it squared away. I must have boogered up the castle nut that came with the water pump as well as the shaft threads. After my filing on the shaft threads the original castle nut still didn't want to start. So I tried an old castle nut and it worked like a charm. Thanks again! Smitty

[Marvin/TN]

Is there not a screw pitch gauge in your tap and die set if not maybe a friend has one.

[smittykid]

Originally Posted by Marvin/TN

Is there not a screw pitch gauge in your tap and die set if not maybe a friend has one.

I found one-thanks!