'59 Model B: Rear Hub 8QJ414

[Keith S]

Found the first major part needing to be replaced: one of the rear hubs is cracked.

Two different hubs, the good one (except for a Helicoil) is casting 8QJ414. The other one is repaired or something. It's casting number is close to: 8QJ8131P1. I'm mot sure what its deal is. When removing the paint I hit some powdery residue then some soft shiny "metal". A lot of it; The "Mack" logo is barely visible. It's too hard for lead.

Anyway, I found a couple 8QJ414 on line but before buying one I thought I check here first for ideas and concerns. Anyone have insight on what to look-out for with used hubs?

[kscarbel2]

49 minutes ago, Keith S said:

Found the first major part needing to be replaced: one of the rear hubs is cracked.

Two different hubs, the good one (except for a Helicoil) is casting 8QJ414. The other one is repaired or something. It's casting number is close to: 8QJ8131P1. I'm mot sure what its deal is. When removing the paint I hit some powdery residue then some soft shiny "metal". A lot of it; The "Mack" logo is barely visible. It's too hard for lead.

Anyway, I found a couple 8QJ414 on line but before buying one I thought I check here first for ideas and concerns. Anyone have insight on what to look-out for with used hubs?

The casting number usually is NOT the part number.

Can you post your truck's line sheet?

[j hancock]

The 8QJ414 casting seems to be available.  I would double check the bearing numbers to see if they are the same side to side and go that route.

[kscarbel2]

28 minutes ago, j hancock said:

The 8QJ414 casting seems to be available.  I would double check the bearing numbers to see if they are the same side to side and go that route.

You can't simply go by a casting number. That casting was machined at least 2 or 3 different ways to meet differing requirements, resulting in different Mack part number "P variations".

[Keith S]

J Hancock: When you say that casting number is still available, what do you mean? I've found several salvage 8QJ414 hubs, but they're all in the northeast - shipping to FL is $250. Anyone know of a cross reference for this hub?

Edited December 1, 2016 by Keith S

[kscarbel2]

Can you post your truck's line sheet?

[Keith S]

What's a line sheet and how do I get one. It's a 1959 B46.

[kscarbel2]

1 hour ago, Keith S said:

What's a line sheet and how do I get one. It's a 1959 B46.

You could get a copy from the Mack museum.

We didn't build many B-46s, just 473, from 1958 to 1965. It had a short B-67 style hood and was targeted at ready mix operations.

[j hancock]

7 hours ago, Keith S said:

J Hancock: When you say that casting number is still available, what do you mean? I've found several salvage 8QJ414 hubs, but they're all in the northeast - shipping to FL is $250. Anyone know of a cross reference for this hub?

Seen available used as you have found.  Too bad you can't find something at a yard down in FL because the only way I would want to do it is in person with carefully looking for any cracks and to verify your bearing number works.