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Steering box rebuild - lash adjuster clearance
Posted by: Chasgee ()
Date: December 01, 2018 08:04PM

Hello everyone,

I’m currently rebuilding by steering box and everything looks pretty good except for the lash adjuster clearance. I measure about 0.008” and the manual calls out for no more than 0.002”. I know there was a shim kit available form Clark’s at one time, but it isn’t available now.

How critical is this lash? If it is, does anyone have a 0.069” shim laying around? That’s what I would need to get to 0.002 inch.

Thanks,

Chuck Gee
Carlsbad, CA

1963 Monza 102 - in the family from new
1966 Corsa 140 Coupe - new project

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Re: Steering box rebuild - lash adjuster clearance
Posted by: Wagon Master ()
Date: December 01, 2018 08:15PM

That's not waaay sloppy but it is important to try to get as close to .002 as possible. That shim is the only thing holding the pitman shaft in position. As it's allowed to move up you get play in the steering wheel.

'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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Re: Steering box rebuild - lash adjuster clearance
Posted by: toms73novass ()
Date: December 02, 2018 04:44AM

I took some shim stock I had and made a little "washer" and placed it under the original shim to bring it back into tolerance.

Clamped the shim stock between two boards, drill hole for screw, then remove from between boards and used snips to make round washer shape.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
65' Monza MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: Steering box rebuild - lash adjuster clearance
Posted by: vairmech ()
Date: December 02, 2018 04:19PM

There should be a number on your shim, from that you can figure out what number to ask for. Several of us have extras!

All of the pressure on the adjuster is against the head. Technically you could pull the shim out and not know there was anything missing. The worm nut is cut straight so no pressure there. The pitman shaft gear is cut on a taper and any pressure it may exert is against the head of the adjuster.

The only thing I can think of why there is a tolerance for that is for later in life wear when no one adjusts the steering box and there could possibly be more play in the shaft and adjuster letting things move more than than they should. Keep in mind that everything in there is hardened, including the shim.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Steering box rebuild - lash adjuster clearance
Posted by: Wagon Master ()
Date: December 02, 2018 05:35PM

vairmech Wrote:
-------------------------------------------------------
> There should be a number on your shim, from that
> you can figure out what number to ask for. Several
> of us have extras!
I think he knows what size shim he's looking for. .069
> All of the pressure on the adjuster is against the
> head. Technically you could pull the shim out and
> not know there was anything missing. The worm nut
> is cut straight so no pressure there. The pitman
> shaft gear is cut on a taper and any pressure it
> may exert is against the head
That's true when you make your lash adjustment with wheel centered in "the tight spot" What happens when your to either side of center, say, a full turn?

'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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Re: Steering box rebuild - lash adjuster clearance
Posted by: Chasgee ()
Date: December 02, 2018 06:54PM

The current shim has a “3” on it. It measures 0.063”, so I guess that’s what the 3 stands for. Based on that, I would need one marked “9”, assuming it measures 0.069”.

Thanks everyone for your help with this. If anyone has that shim and is willing to part with it, please let me know. Otherwise I’ll use the shim stock idea.

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Re: Steering box rebuild - lash adjuster clearance
Posted by: joelsplace ()
Date: December 03, 2018 07:45AM

Wagon, when it's off center the slop in the adjuster would only allow the gears to get tighter the way I understand it. Am I missing something?

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Re: Steering box rebuild - lash adjuster clearance
Posted by: Wagon Master ()
Date: December 03, 2018 08:32AM

Could be, but that has not been my experience.

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Re: Steering box rebuild - lash adjuster clearance
Posted by: vairmech ()
Date: December 03, 2018 09:06AM

When the steering wheel is turned the gear actually gets play in it because the pitman shaft gear is on a double taper. The pitman shaft could actually travel down on it's own decreasing the clearance of the gears by the play in the adjuster. When you turn the wheel back to center you could actually get binding, if the adjuster play was way excessive, you could actually break something.

No, I didn't think of off center just the initial lash on center. ( Not afraid to say when I didn't think of something.)

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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