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Creek Jenkins 
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Joined: 14 Sep 2009
Location: Northern Minn
Points: 812
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 Topic: D17 S1 headlight boss thread
Posted: 30 Mar 2015 at 12:56pm |
what the helms thread is in the headlight bosses? I am trying to fit a set of aftermarket headlights to the front of my '59 D17 and can't seem to finger out what thread it is. I tried 1/2" fine, coarse and even found a 1/2" hollow lamp nipple. Can't get any of them started. It looks like 1/2" fine thread, but the bolt won't go in and I don't want to screw up the threads. It would be nice to have a hollow bolt to run the wires thru, but first I need to find what the threads are. Anyone run into this? cheers, Creek
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 5106
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Posted: 30 Mar 2015 at 2:08pm |
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I'm not positive about a D17, but all of the B,C & CA's I've worked on were 1/2" coarse. It just may be that your threads are a bit too rusty. I usually use a tap first before I'll put in headlights, that also helps to make a good ground. The other possibility might be you after market lights are metric thread.
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den/southern illinoi
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Joined: 11 Sep 2009
Location: Sparta, Illinoi
Points: 2068
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Posted: 30 Mar 2015 at 4:26pm |
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They should be 1/2 inch fine thread. Just got done with 2 sets of lights and the front cowling and they were all 1/2 inch fine thread. Den
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Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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Creek Jenkins
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Joined: 14 Sep 2009
Location: Northern Minn
Points: 812
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Posted: 30 Mar 2015 at 4:58pm |
thanks for the tip, it did look like fine thread, maybe only the smaller or older tractors use the coarse. I'll run a 1/2" fine tap thru there and clean the threads up. My aftermarket headlights have 3/8" bolts, so I'll just replace them with 1/2" fine. Have to figure out a way to drill them out for the power wire though. cheers, Creek
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Ted J
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Joined: 05 Jul 2010
Location: La Crosse, WI
Points: 18943
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Posted: 30 Mar 2015 at 7:24pm |
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I did mine for the C in my drill press. Start with a small bit and get bigger as you go. Try and get as close to the middle as you can! Use a center punch and then drill. Also chamfer the ends so the wire won't wear. Worked like a charm. I had to drill 3 as one was a little too far off. I got in a hurry and went too big right away.
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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BradRisen
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Joined: 09 Feb 2012
Location: KY
Points: 265
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Posted: 30 Mar 2015 at 9:01pm |
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If you have access to a metal turning Lathe ,makes it real easy to drill perfect, Dead center Holes in bolts
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Creek Jenkins
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Joined: 14 Sep 2009
Location: Northern Minn
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Posted: 31 Mar 2015 at 3:06pm |
I think I can get a machinist at work to chuck a couple bolts up in a lathe and drill them out. Prob cost me a Snickers bar. King size if he has to find the bolts. Creek
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