F15a steering knuckles

[Jacques Reed]

Hi Dave,

From my later edition 1943 F15A-01 parts manual there were three types listed:

C11Q-3337 "used for replacing Steering knuckle CO1Q-3340 on R.H. side only" (it had 1/2" studs)

C11Q 3339 "Knuckle steering and cups assembly used with 1/2" studs" (no side specified)

CO1Q 3340 "Knuckle steering and cups assembly L.H. side only. Used with 7/16" type studs only"

Looks like C11Q 3339 is interchangeable L-R but perhaps another MLU member can shed some more light on it.

I do know of the two stud size differences as I have both types but not on same truck.

Hope this is of some help.

Cheers,

[Jacques Reed]

Further to previous post:

Attached is a photo of two steering knuckles with the two sizes of stud holes.

The one with the 7/16" dia stud holes is on the left side of the picture and they are noticeably smaller than the 1/2" dia ones on the knuckle on the right side of the picture.

Cheers,

[Private_collector]

Jacques,

I've taken screen shots of your two posts, hope you don't mind.
I have a feeling I may use that info at some point in the future.
Had no idea of any of that.

[Dave Schindel]

OK , beginning to look like the 1/2 in. threaded one goes on the right and 7/16 on the left. I have a 1/2 in. threaded one that came off the right side. I have 2 others I have not checked yet. I did not realize there was a difference in threads.

[Jacques Reed]

Further to the part numbers previously listed:

The first digit after the "C" in the part number is the year the part was designed and released.

Therefore the knuckles starting with C1 were designed and released in 1941 and the one with the number starting with C0 were designed and released in 1940.

Points to early pre 1941 CMP F15A's had the two size studs on the knuckles and later they standardized them to the larger 1/2" diameter studs.

Both sides of my 1944 model have 1/2" diameter studs.

No doubt there would be exceptions due to using up old stock post 1941 and replacement parts.

I bought the early 7/16" stud NOS knuckle for a spare a while back and only realized the difference when I brought it home. Thought maybe it was for a Marmon Herrington afterwards so on the shelf it sits. Anyone want it?

Cheers,

[Jacques Reed]

Now I am confused (More so than normal!)

While putting away the knuckles I photographed for the earlier post I noticed the Part number C01Q 3358 cast into one of the knuckles as per the photo attached. None of the other two knuckles had any numbers cast into them.

Very different to the F15A parts list numbers I quoted.

It definitely came off a 4-7/8" steering end as used on the F15A. Still, as is often the case, it does not mean it is the correct one.

I don't have a parts list for the larger trucks with 6" steering ends and would have thought those knuckles would not be the same size but could it be?

Anyone able to shed some light on this one?

[Dave Schindel]

Tough one.....none of my knuckles have numbers,at least none that I could find.Just the Ford logo stamped on the inside near the bearing race.