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Old 09-06-2020, 07:31 PM   #1
miken7132
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Default 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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Old 09-06-2020, 10:22 PM   #2
GRutter
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Default 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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Old 09-07-2020, 05:05 AM   #3
Werner
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Default 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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Old 09-07-2020, 01:07 PM   #4
miken7132
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Default 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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Old 09-07-2020, 01:26 PM   #5
Werner
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Default Re: 7-tooth steering full lock

iMy car's steering wheel turns 2 3/4 rev
right/left.
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Ford Model A Roadster, 1928
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Last edited by Werner; 09-08-2020 at 12:00 AM. Reason: Cor. turns
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Old 09-07-2020, 09:53 PM   #6
1955cj5
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Default Re: 7-tooth steering full lock

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Just went out and checked.....

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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