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04-12-2020, 01:43 PM | #1 |
Junior Member
Join Date: Jul 2017
Posts: 25
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Tread chaser or thread size
I'm looking for a thread chaser for the cam shaft end, or can some one tell me what the tread size is. The end was clinched when the original camshaft nut was peened with a chisel. I don't want to force the new cam nut over the damaged threads.
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04-12-2020, 02:42 PM | #2 |
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Join Date: Feb 2011
Location: Lincoln, Nebraska
Posts: 1,905
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Re: Tread chaser or thread size
If it is just the threads at the end get a small triangle shaped file and chase the thread from just below the damaged area and work your way out towards the end.
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Dave / Lincoln Nebraska |
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04-12-2020, 07:49 PM | #3 |
Senior Member
Join Date: Jun 2013
Location: Western Springs, IL
Posts: 323
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Re: Tread chaser or thread size
Re-threader files are available and come with numerous thread counts and pitches. This could be a place where you could use one.
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04-12-2020, 07:52 PM | #4 |
Senior Member
Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,817
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Re: Tread chaser or thread size
Or you could use an actual thread file. https://www.amazon.com/General-Tools...738955&sr=8-10
Sorry I don't know what the cam thread pitch is. |
04-12-2020, 08:03 PM | #5 |
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Join Date: Jul 2011
Location: Redondo Beach, CA
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Re: Tread chaser or thread size
abachman3 has faster fingers...
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04-13-2020, 11:18 AM | #6 |
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Location: Temecula, CA
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Re: Tread chaser or thread size
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04-13-2020, 11:30 AM | #7 |
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Join Date: Aug 2012
Posts: 875
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Re: Tread chaser or thread size
Haha, Easy for you to say. Not everyone has a box full of cam nuts.
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The Master Cylinder Enjoying life at the beach in SoCal... |
04-13-2020, 04:50 PM | #8 | |
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Join Date: Jul 2010
Location: Cow Hampshire
Posts: 4,175
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Re: Tread chaser or thread size
Quote:
Interesting anomaly. You buy the new nut AND you buy the wrench from one of the mainline suppliers. Both from one house. The wrench doesn't fit the nut. I took the nut as being made to a Ford drawing, and modified the wrench with a file. This something I could see happening. The wrench is TOTALLY aftermarket. Somebody has a wrench design, makes them for fun and profit, and may have a manufacturing issue develop unbeknownst. Rinse & repeat. It happens all the time in business, especially when quality is not formally controlled. BUT - You would think that someone would be curious enough to at least TRY the two components together - lest there be some issue that gets returned? Most buyers probably don't have a drawer full of files, and may not have the skill to use them properly. Joe K
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04-13-2020, 05:38 PM | #9 | |
Senior Member
Join Date: Aug 2012
Posts: 875
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Re: Tread chaser or thread size
Quote:
I just buy the "modern" style cam nuts and use a 1½" socket on it and call it a day.
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04-13-2020, 05:48 PM | #10 |
Senior Member
Join Date: May 2010
Posts: 313
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Re: Tread chaser or thread size
A set of thread files should be in ever tool box.
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04-13-2020, 06:07 PM | #11 |
Senior Member
Join Date: May 2010
Posts: 175
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Re: Tread chaser or thread size
These threads are 16 threads per inch. Snap On makes a very nice thread chasing kit that has thread files for the various pitch of threads.
Dave |
04-14-2020, 10:08 AM | #12 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,371
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Re: Tread chaser or thread size
Most chasers have four pitch sets on each end for a total of eight different pitches. They are handy to have for both Unified and Metric. I have those and British Standard and Association. When you repair and restore things, you can never have too many tools.
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04-14-2020, 10:26 AM | #13 |
Senior Member
Join Date: Aug 2012
Posts: 875
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Re: Tread chaser or thread size
Isn't that one of the reasons for having a Model A? Another reason to buy more tools?
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The Master Cylinder Enjoying life at the beach in SoCal... |
04-14-2020, 04:50 PM | #14 |
Senior Member
Join Date: Jan 2011
Location: Palmyra, NJ
Posts: 475
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Re: Tread chaser or thread size
Here is a good source for two piece thread chasers. They sell them individually or in sets. Great company to deal with. Supergnat
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04-15-2020, 05:46 AM | #15 |
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Location: VA
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Re: Tread chaser or thread size
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04-15-2020, 08:04 AM | #16 |
Senior Member
Join Date: Jan 2011
Location: Palmyra, NJ
Posts: 475
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Re: Tread chaser or thread size
No sure why the link I sent disappeared. The company is JME Supply LLC located in Ohio. It is a small veteran (John) run business that specializes in rethreading dies It was recommended to me by someone at the Thread Tool Supply Company in Wisconsin since they did not have the size I needed (5/8-18). You should be able to Google either of them to get information.
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04-15-2020, 08:39 AM | #17 |
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Join Date: May 2010
Location: Long Island, NY
Posts: 3,432
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Re: Tread chaser or thread size
The thread on the camshaft is special for an interference fit of the nut. Commercial thread chasers will ruin it. Use Jim Brierly's suggestion of a thread file to fix it.
As for the availability of a camshaft nut, one should look at a parts catalog. Bratton's has the nut for less than $6. In addition, engine re-builders are a likely source for a used nut suitable to make the tool Jim suggests.
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Bob Bidonde Last edited by Bob Bidonde; 04-15-2020 at 08:55 AM. |
04-15-2020, 09:22 AM | #18 |
Senior Member
Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,817
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Re: Tread chaser or thread size
During this time of "stat at Home", I have been re-reading some of my Model "A" News and Restorer magazines before I start the day.
Low and behold, this morning while reading the Tech Q & A section of the Model "A" News there was a mention of the cam threads.(pg 7). It states they are 1-16 U.S.F. Milled Thread. It also says that U.S.F. later became U.S.S. or fine threads today. This info from the Benson Ford Library. |
04-15-2020, 11:41 AM | #19 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,066
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Re: Tread chaser or thread size
I do happen to have a few extra nuts, I'll sell them cheaply, but you must order a dozen! -
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04-15-2020, 06:18 PM | #20 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,371
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Re: Tread chaser or thread size
Screw threads have evolved a lot over the years. Unified National Course and Fine are pretty well know but there is also a Unified National Special or UNS thread pitch specification that has stumped more than a few old prewar Harley Davidson enthusiasts. The special pitches they used were half way between UNC and UNF threads. I guess they wanted the exclusive rights to the HD hardware. Finding the taps & dies for these is difficult but not impossible. I have the most common sizes. Another odd one was the British Standard Cycle thread. No matter how big the bolt shank is, they all had 26-TPI threads.
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