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sntsftbll
01-13-2007, 12:24 AM
Going to do king pins in an M series p/u. Have done king pins in alot of straight axles on our work trucks and tractors, before not exactly rocket science. Good thing since I am not a rocket scientist. But I can't tell which way the lock pin comes out of the axle. So I thought I might get some advice before trying to get it out the wrong way and forcing myself to use language I normally reserve for when I miss the drift pin with the hammer and it kisses my hand. Any thoughts?

GTtim
01-13-2007, 10:45 AM
You will probably get a reply quicker if you go here: http://www.network54.com/Forum/23885/

Tim K.
'64 R2 GT Hawk

garyash
01-13-2007, 11:27 AM
The M truck shop manual isn't any help on this, but the R series shop manual has good pictures and directions. Assuming (ha ha) that no one has disassembled your axle before, the R shop manual and parts catalog show the lock pin inserted from the front of the axle with the large end toward the front. Strangely, the shop manual describes inserting it from the rear! The fat end is supposed to be just inside the surface and the housing staked over to keep the pin in place. You may need to grind around the hole a little where it was staked. A small drift should then remove the lock pin when you tap on the skinny end.

After this many years, your chances are slim of getting things to move, so you may save yourself lots of aggravation by removing the entire axle and taking it to a place with a big shop press. You really should use an arbor press to put the new bushings in, anyway.

Drill a hole in the top king pin plug, pry it out, then use a drift to knock the pin and lower plug out, or use the shop press.

Of course, there are no new king pins available of the correct length for M5 trucks. The 665297 pin for M5s was 5-3/32" long. The 677608 pins for later 2R5 trucks through '64 was 5-19/32" long. You can use these if you grind exactly 1/4" from each end to keep the top edge of the locking slot 1-13/32" from the top end. Stude International has the bushings, plugs, etc. but no 665297 pins. You can buy a full kit (678171) with the later pins but the bushings may not have holes in the right place to line up with the grease fittings. I guess you could drill new holes in the bushings. You can also swap in the 2R5 knuckles and use the longer pins, etc. This would be a good time to do it.

The new bushings are supposed to be reamed to the correct size and alignment once they are pushed into the axle. The pin diameter was .8025/.8030". You need to select the right shims for the upper knuckle yoke for no end play.

[img=left]http://www.studegarage.com/images/gary_ash_m5_sm.jpg[/img=left] Gary Ash
Dartmouth, Mass.
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.com

sntsftbll
01-13-2007, 01:13 PM
Gary, your scaring me. I was hoping this might be easier than it sounds. The press I have the bushing cutters I have (just can't line bore them but could get them done) The heat influence tool I have. Now I need the smarts to make bigger pins smaller and fit uh oh not much hope on the smarts (can I borrow some) My big concern is that the diameter is the same that would be hard to change because of the plating. Length can be done.
The later kit I have from Stephen Allen is not the correct kit?
Thanks for the info! This group is great help!!! I really appreciate the info.

garyash
01-13-2007, 01:48 PM
Not too much to be scared of! Actually, both pins are the same diameter, so it's only a matter of having a machine shop grind the ends down by 0.250". The pins were hardened to Rockwell 59-64, so they are pretty hard, can't be cut with saw, etc. They were not plated, just well polished.

The kit for the original king pins was 674533, the later kit is 678171. The bearings, shims, and plugs are the same in both kits; only pins and bushings different. The bushings can't be that different. Maybe if you can get the old ones out in nearly one piece, you can see what's different and modify the newer ones. I'd be interested to know just what changed. I have the original Studebaker drawings for the two pins, but not the bushings.

[img=left]http://www.studegarage.com/images/gary_ash_m5_sm.jpg[/img=left] Gary Ash
Dartmouth, Mass.
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.com