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07-19-2014, 11:57 AM | #1 |
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Modifing speedometer turtle
I want to use a 17 tooth turtle gear. As the gears have lower number of teeth the diameter of the gear get slightly smaller. I want to use a 19 tooth turtle housing and cut the arc into the turtle deeper so the new gear meshes with the drive shaft gear properly. Any suggestions as what tools to use to modify the turtle housing?
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07-19-2014, 12:26 PM | #2 |
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Re: Modifing speedometer turtle
Terry,
Grab/fixture the turtle in your mill then set your boring bar to cut the desired radius to fit the torque tube diameter. If you can borrow a 17 turtle that would be great to 'swipe' the critical dimensions. You will discover that depending on the 19t turtle casting you use it is possible to run out of side wall....this happens rarely. OR If you have a 17t turtle to get the center line and other dims from send it to me and I'll do it for the cost of shipping. Charlie ny |
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07-19-2014, 02:36 PM | #3 |
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Re: Modifing speedometer turtle
Once again an outstanding offer from one of Fordbarn's finest members. Full kudos to Charlie.
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07-20-2014, 05:39 AM | #4 |
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Re: Modifing speedometer turtle
Wow: Thanks for the offer Charlie!
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07-20-2014, 05:48 AM | #5 |
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Re: Modifing speedometer turtle
Charlie ny = #1
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07-20-2014, 08:42 AM | #6 |
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Re: Modifing speedometer turtle
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07-21-2014, 06:33 AM | #7 |
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Re: Modifing speedometer turtle
Brattons sells the 17 tooth gear (Moly. embedded Nylon), the V8 shafts (square hole for cable) and the V8 end shaft retaining caps. They do not sell the housing. If you check the diameter of a 19 gear Vs the 17 you can determine the additional depth of cut necessary to modify a 19 housing. I have the gear on order but has not arrived.
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07-21-2014, 01:19 PM | #8 |
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Re: Modifing speedometer turtle
This type of thing is what makes the Ford barn so great! I am just going through the same thing and boom! Here is the solution!! Very cool...
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07-21-2014, 01:56 PM | #9 |
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Re: Modifing speedometer turtle
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07-21-2014, 02:20 PM | #10 |
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Re: Modifing speedometer turtle
I would suggest if you modify a turtle with another gear you file the 18 or what ever off and if possible stamp the 17 on the housing so the next guy knows what's going on. G.M.
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07-21-2014, 02:48 PM | #11 |
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Re: Modifing speedometer turtle
I believe we found out several years ago that the 17 tooth nylon gear from Bratton's Model A Parts will work in an 18 tooth, #18, 11-39, turtle housing, normally used with 3.54 gears, with no modifications necessary to the #18 housing.
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07-21-2014, 07:16 PM | #12 |
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Re: Modifing speedometer turtle
Terry why not call me for a n.o.s. #17 turtle assembly.
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09-04-2014, 08:33 PM | #13 |
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Re: Modifing speedometer turtle
Bumping this thread with a question: Can an 18 tooth gear be used in a 19 housing without modification?
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09-05-2014, 07:25 AM | #14 |
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Re: Modifing speedometer turtle
I have place a 18 gear in a 19 housing and it worked fine.
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09-05-2014, 09:19 AM | #15 | |
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Re: Modifing speedometer turtle
Quote:
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02-14-2015, 03:37 AM | #16 |
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Re: Modifing speedometer turtle
I have used a 18 tooth gear in a 21 tooth housing and it worked ok also.
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02-14-2015, 08:23 AM | #17 |
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Re: Modifing speedometer turtle
Does anyone have a listing of which turtles go with which rear ratios?
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02-14-2015, 06:19 PM | #18 |
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Re: Modifing speedometer turtle
Look in the green bible parts book,they list them
Lawrie |
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