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09-06-2020, 07:31 PM | #1 |
Junior Member
Join Date: May 2010
Posts: 15
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7-tooth steering full lock
I rebuilt the 7-tooth steering box for our '29 Tudor; new sector, new worm with steering shaft, etc. After installing it in the car it only took 2 turns of the steering wheel to go form full lock to full lock. At full lock the backing plate (either side) hits the king pin locking bolt on the backside of the axle. With the drag link removed the steering wheel has 3 full turns lock to lock which I understand is normal for a Model A. The springs and cups in the drag link and tie-rod are good. The end plugs are screwed in so that they are flush with the ends of the tie rod and drag link. The toe-in is 1/16 of an inch. After working on this for most of the day I can't figure out why it only takes 2 turns instead of 3 to go from lock to lock. Appreciate any advice you can provide.
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09-06-2020, 10:22 PM | #2 |
Senior Member
Join Date: Sep 2017
Location: Mint Hill, North Carolina
Posts: 386
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Re: 7-tooth steering full lock
I sold my 28 so can't run out to my garage to compare... but you may not have a problem.
Sounds like you have an original length pitman arm (as compared to the shorter length arms available to make steering effort easier). It's the reason why you can put a shorter pitman arm on your steering, and not run out of travel on the steering sector before the spindle stops touch the lock nuts. |
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09-07-2020, 05:05 AM | #3 |
Senior Member
Join Date: Jan 2019
Location: Germany, near Aachen
Posts: 1,151
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Re: 7-tooth steering full lock
Miken,
as GRutter wrote, the translation from the steering wheel to the tie rod depends on the length of the pitman. Are the wheels on the ground? Or is the car jacked up and the wheels or/and the axle hang freely? Then the steering angle geometry changes and the kingpin bolts hit earlier. I completely overhauled my 7-tooth steering in the last winter. I'm going this afternoon to measure how many turns my steering wheel makes from left to right.
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Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version |
09-07-2020, 01:07 PM | #4 |
Junior Member
Join Date: May 2010
Posts: 15
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Re: 7-tooth steering full lock
Thank you for the replies. The car has an original pitman arm and is currently on axle stands. I plan to adjust the brakes tomorrow then take it out for a test drive. I'll check to see if the number of steering wheel revolutions to full lock changes when it's on the ground. I checked another '29. It also had 2 revolutions to full lock when raised off the floor. Maybe that's what it should be. I was basing the 3 revolution count on other posts in this forum and Les Andrews' book (volume 1, page 1-310) where he says the mid point should be at approximately 1 1/2 revolutions.
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09-07-2020, 01:26 PM | #5 |
Senior Member
Join Date: Jan 2019
Location: Germany, near Aachen
Posts: 1,151
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Re: 7-tooth steering full lock
iMy car's steering wheel turns 2 3/4 rev
right/left.
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Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version Last edited by Werner; 09-08-2020 at 12:00 AM. Reason: Cor. turns |
09-07-2020, 09:53 PM | #6 |
Senior Member
Join Date: Apr 2015
Location: Boise, Idaho
Posts: 1,576
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Re: 7-tooth steering full lock
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1929 CCPU I get 2 full turns of the steering wheel, lock to lock. Front wheels off the ground. 7 tooth steering box. Front end rebuilt, new spindle arms and bolts, original length pitman arm. Sounds like your's is normal.....
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Early '29 CCPU that had a 4-speed, but not any more.......in the family since '62 |
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