The Stovebolt Site Forums The Shop Area Engine Shop Will you teach me about motor mounts? '54 3100

> Bob -
The original 3/8-24 carriage bolts in the ends of my 1954 front mount were not drilled. I used a lock nut on them. See my reply to Denny Graham below.

re: 1/2" bolts - I don't know if the front mount for a '46 is the same as for a '54. A 'Bolter with a '46 like yours can give a better answer.
1/2" bolts are used in the rear mounts. I don't know about 1/2" bolts for the front mounts. I couldn't find any listing in the MPC.

> Denny - The detective work continues!
I searched for confirmation of the 3/8 bolts drilled for cotter pins when I was buying nuts and bolts. The MPC describes bolt #3701135 as "3/8-24 x 1-7/8 carr. hd." Hardened carriage bolt, but no reference to drilled. <EDIT - "carr. hd." means "carriage head", not "hardened."> Nut #838283 for '37-'53 was described as "3/8-24 sltd" which implies that a cotter pin was used with the slotted nut.

The '54 Assembly Manual shows the 3/8 nuts with a different part #117212 or #451010. I couldn't find the part in the MPC.

The '54 Shop Manual describes the torque on the front motor mount nuts "All bolts should be kept tight except the two self-locking end nuts on front motor support."

Since the nut number changed from 1953, and the '54 Shop Manual called the nut a "self-locking" nut, perhaps the drilled bolt and slotted nut changed to a solid bolt and lock nut in 1954.