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Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304065 Thu Mar 21 2019 04:23 PM
Joined: Apr 2005
Posts: 7,388
J
Justhorsenround Online
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Tim, he was referencing a post by 4100 Fire Truck.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


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Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304078 Thu Mar 21 2019 06:05 PM
Joined: Sep 2001
Posts: 28,107
tclederman Offline
Boltergeist
"Tim, he was referencing a post by 4100 Fire Truck."

Thanks, Martin & Lugnutz

Before I look something up, I like to be sure of the details.

hmmm:
Lugnutz: 1965 C10 with IFS
4100 Fire Truck: ???? (I do not see a vehicle designated)

Maybe someone else will look up the specs that are needed?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304081 Thu Mar 21 2019 06:22 PM
Joined: Oct 2005
Posts: 2,615
MNSmith Offline
"Hey! I sound like Darth Vader!!
Originally Posted by Lugnutz
So, I think the answer to my question above is 0.5” of toe. Correct?



A 1/2" seems a little much.

Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304083 Thu Mar 21 2019 06:36 PM
Joined: Jan 2013
Posts: 1,284
S
sstock Offline
Shop Shark
I've always subtracted the front measurement from the back and dont divide by 2.
I have my 53 with truck bias ply tires set at 3/32" toed in , tires seem to be wearing evenly but not enough miles to close the door on that one yet.

Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304092 Thu Mar 21 2019 07:28 PM
Joined: Sep 2011
Posts: 1,771
L
Lugnutz Offline OP
Shop Shark
MNSmith,
I’m not sure you understood my “simplified example” question so I’ll restate things a different way.
Factory Service Manual says my toe should be 3/16”.
The link tclederman shared wants me to subtract the distance between the front tire tread centerlines from the distance between the rear of the tire tread centerlines (B minus A).
I’ve been thinking if I cause my tires to “toe in” 3/16”, then the difference between the front and rear will be 3/8”. If I do the math I get 65.375” - 65” = 0.375” but in reality the tires have only moved toward each other by 0.1875” (which is 3/16”).

Last edited by Lugnutz; Thu Mar 21 2019 11:20 PM.
Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304131 Fri Mar 22 2019 12:07 AM
Joined: Jan 2018
Posts: 143
4
4100 Fire Truck Offline
Shop Shark
When I get a chance I will try and post pictures of how I make reference marks on the tires. Trying to scribe a visible line that it true, and easily visible on a black tire is tough to do. And forget about using tread edges, and a tape measure. I simply make crosshairs on a piece of tape on both tires, and roll the vehicle back, and forth to use the same reference point. Works to perfection. I figured that out trying to set toe on a race kart sitting on a stand.

Last edited by 4100 Fire Truck; Fri Mar 22 2019 12:08 AM.
Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304149 Fri Mar 22 2019 01:41 AM
Joined: Oct 2005
Posts: 2,615
MNSmith Offline
"Hey! I sound like Darth Vader!!
Originally Posted by Lugnutz
MNSmith,
I’m not sure you understood my “simplified example” question so I’ll restate things a different way.
Factory Service Manual says my toe should be 3/16”.
The link tclederman shared wants me to subtract the distance between the front tire tread centerlines from the distance between the rear of the tire tread centerlines (B minus A).
I’ve been thinking if I cause my tires to “toe in” 3/16”, then the difference between the front and rear will be 3/8”. If I do the math I get 65.375” - 65” = 0.375” but in reality the tires have only moved toward each other by 0.1875” (which is 3/16”).



Not the way we've always done it. If the spec calls for 1/8" toe in, and, let's say, we're working with a roughly 61" tire center line to tire center line, or "A" and "B" as the diagram shows, then your B measurement will 61" and your A measurement will be 60 7/8". A difference of an 1/8" from front to rear. Thing is, you might've only moved the front or rear 1/64" to get the number you need, if even that.

One quick way we would get a reference mark is to raise the front of the vehicle. Using white or silver paint, spin the wheel while spraying the center of the tire. Let dry a bit. Spin the assembly and hold a scribe to the center of the paint to make a reference mark. Eventually, after a little driving, the paint comes off. These days, some new tires already have the reference mark from the manufacturer.

Re: Modern alignment tool? Any recommendations? [Re: Lugnutz] #1304166 Fri Mar 22 2019 03:29 AM
Joined: Feb 2004
Posts: 18,702
H
Hotrod Lincoln Online
Boltergeist
I did the same center-marking procedure with chalk, not paint, and a spring-loaded scribe for 30-something years before getting a Hunter D111 alignment machine that measured everything electronically. The toe measurement is simply the difference between front and rear measurements- - - -to get 1/8" toe-in, just move the tread centerline in 1/16" on each tire. It's easy to over-think a very simple procedure. Anything over about 3/16" difference in the front and rear measurement is going to cause the tread to "feather edge" from the tires scuffing against each other. 1/2" toe-in will wear out the tires in a few hundred miles.
Jerry


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