M1 / M1A1 Heavy Wreckers and Accessories

Military Trucks 2 1/2 ton and greater, Wanted, For Sale (NO AUCTION or EBAY), and Knowledge Base

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Shane Hodby
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by Shane Hodby » Sat Jan 05, 2013 2:45 am

Hi Sam
Re your bearings try Bearing service at Boundry rd Wacol they are very very good with their pricing also the diffs are very similar to a Mack of which I have had a fair bit to do with as you know so when you set your diff up you may want to make sure that your 2 Main caps are done exactly to specs I mean in the centered way as if they are not and they are out by only a few mm the diff head will not drop back all the way into the housing as it will hit on the webbs welded into the bottom of the housing Just A tip Mack actually have a 1 inch thick ring to line them up just a tip from someone that has had the problems before
Cheers
Shane
1945 Studebaker US6 88016 DOD 1-19-1945 ARN 89553 (Bullwinkle)
1942 MB 131508 DOD 3-30-1942 U.S.A. 2083320 confirmed (Olive Oyl)


Shane Hodby
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Location: Boonah Queensland Australia

Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by Shane Hodby » Sat Jan 05, 2013 2:45 am

Hi Sam
Re your bearings try Bearing service at Boundry rd Wacol they are very very good with their pricing also the diffs are very similar to a Mack of which I have had a fair bit to do with as you know so when you set your diff up you may want to make sure that your 2 Main caps are done exactly to specs I mean in the centered way as if they are not and they are out by only a few mm the diff head will not drop back all the way into the housing as it will hit on the webbs welded into the bottom of the housing Just A tip Mack actually have a 1 inch thick ring to line them up just a tip from someone that has had the problems before
Cheers
Shane
1945 Studebaker US6 88016 DOD 1-19-1945 ARN 89553 (Bullwinkle)
1942 MB 131508 DOD 3-30-1942 U.S.A. 2083320 confirmed (Olive Oyl)

Shane Hodby
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by Shane Hodby » Sat Jan 05, 2013 2:50 am

Dont know what happened there but my post went on twice
1945 Studebaker US6 88016 DOD 1-19-1945 ARN 89553 (Bullwinkle)
1942 MB 131508 DOD 3-30-1942 U.S.A. 2083320 confirmed (Olive Oyl)

kw573
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Sat Jan 05, 2013 10:37 am

Hi Shane,

Yes, that makes sense about the diff. I didn't have that issue with the Diamond T as they are straight-cut = no side load = no support lugs in the axle housing.

I'll give Bearing Service a call.

PM sent.

Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Sun Jan 06, 2013 8:02 pm

Shane,
I can't find contact details for Bearing Service in Wacol. Do you have them?
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by 40 Chevy » Tue Feb 12, 2013 3:31 am

Here is a photo I came across from the internet of the vice mount. The truck is owned by Tauber's Towing in Baltimore Maryland. I belive it came out of the Frank Buck collection some years ago.

Image

John G
1940 G4112
1942 G509 969A
1942 G116 series 2
1944 G116 series 5
1942 Sterling HC 165 tractor
1944 Autocar U7144T

kw573
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Thu Feb 14, 2013 2:52 pm

Hi John,
Hi all,

I have been in the outback, working where my phone and internet don't work. Hence the silence.

Hmmm, I wonder if that is an original vise mount. Do you have any idea of the probability of it being original?
It is very easy to fabricate and much of the truck was just that, fabricated.

It mounts the vise higher than I would have imagined, but closer in than the guessed one that I made. The corners on the plate under the vise have not been rounded, suggesting a hurried or low-energy job.
What do others think?

Have a nice day.
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by 40 Chevy » Thu Feb 14, 2013 3:07 pm

The high mounting location gives you more workable area for using the vise.

John G
1940 G4112
1942 G509 969A
1942 G116 series 2
1944 G116 series 5
1942 Sterling HC 165 tractor
1944 Autocar U7144T

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by Captain Crank » Fri Feb 15, 2013 4:09 am

kw573 wrote: Hmmm, I wonder if that is an original vise mount. Do you have any idea of the probability of it being original?
I spoke with Taubers a couple years ago, that is not an original vice mount.
"Beer is proof that God loves us and wants us to be happy"
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It goes quicker towards the end"
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Fri Feb 15, 2013 1:03 pm

Oh well,
one day, sooner or later, an original one will come to light.
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Fri Apr 12, 2013 2:24 pm

Hi all,
Work has taken me way beyond the reaches of my workshop and internet connection.

Back to the M1A1 diff repair.
I have managed to get the badly worn crownwheel and pinion 'set' to a useable contact pattern and am now ready to assemble the lower portion of the diff which should be fairly straightforward.
Torquing the pinion nuts was an issue to me. Although the manual simply says 'tight', experience tells me this is important to get it right.

For the more technical readers: A general torque chart tells me that an 1 1/2" UNF nut should be torqued to 1400-1600ft-lb! Phew, that is a lot. The nut is secured with a split pin as you would expect. The slotted nut has 3 slots, giving 6 positions per turn that the nut can be locked, but the shaft has only one pin hole. This means that there is 60deg turn between nut positions. At those high torque specs, 60degs is a big jump. It could take 700ft-lb up to 2000ft-lb! With nothing in between. So I figured that if it was that critical, the designers would have put more holes in the shaft. But they didn't. So, I torqued it up to 300ft-lb, the limit of my torque wrench, put a socket and bar four times the length onto it and applied similar pressure and , wow! ... the hole lined up! That was good enough for me.

Here is a picture of how I held the diff to apply such high torque.
Image


Next is the bullgear carrier with new bearings, then put it in the axle housing. (That rolled off the tongue too easily!)

Have a nice day.
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Sat Apr 13, 2013 1:42 pm

Hi all,

'best laid plans of men and mice . . . .'

As I am home for a few days, I managed to spend half a day on the Kenworth diff.
We fitted the new bearings to the bullgear/diff carrier and bolted it to the diff housing. Cleaned out the axle housing and fitted the new axle shaft seals ready to drop the diff in. Rigged up the chain block, wheeled the diff in under the truck, lifted, wriggled, levered, pushed, grunted and heaved it into position ready to drop onto the studs. These are the studs that I spent a few hours straightening and re-welding the loose ones. Unfortunately this positioning meant that at times the weight of the diff was pushing down on some of the studs, and it broke one of them out, dropping it out the oil drain hole. Hmmmmmmm....... I can't remember, but I hope that it is not one of the studs that I "fixed"!!!! Also, another one of the studs is at an angle enough so that it won't line up in the hole.
Nothing for it. It had to come back out. So now it is under the truck, hanging on the chain, all wrapped in plastic until I can get back to it in about 12 days time.
I can see why the manual says to roll the whole tandem out to do this job. But I am still glad I didn't go that far.

Have a nice day.
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Thu Apr 25, 2013 11:19 am

Hi all,
I have managed to get half a day on the Kenworth yesterday. One morning last week I managed to fix the problem studs on the axle housing, so it was time to have another go at fitting the diff.
Image

Image

Image

Image

More to come.
Sam.

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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by 40 Chevy » Thu Apr 25, 2013 11:47 am

Sam;
A pretty brave fellow you have there, walking around barefoot!!!! with that amount of weight on the hand truck :roll:

You know, since you painted the reduction housing, a complete detailing of the frame and chassis is in order, lest the JEEP POLICE will be knocking at your door!!!

You have proven us all wrong that you "can't remove" the reduction unit while axle housing are still under the chassis....

Carry on.


John G
1940 G4112
1942 G509 969A
1942 G116 series 2
1944 G116 series 5
1942 Sterling HC 165 tractor
1944 Autocar U7144T

kw573
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Re: M1 / M1A1 Heavy Wreckers and Accessories

Post by kw573 » Thu Apr 25, 2013 12:13 pm

Hi John,

Yes, that mate of mine never wears shoes. He went to his father-in-laws funeral in a suit, but bare feet!!!! He lives an almost hillbilly lifestyle, but is a nice bloke.
Paint it all? Actually, that is one reason I didn't originally pull the whole tandem. I'd want to clean/fix/paint the lot! But I have a rally in two months time to have this going for.

continued . . .

Image

Image

Image

When I got this far, things started to get real intense. From the previous attempt, I knew that it would take some care to not damage the studs, ... again. But when lining up the holes, it became clear that the whole shootin' match was never done properly from new. One of the original holes with a stud welded in did not line up with the hole in the diff housing. No, this time it wasn't a bent stud. The hole didn't align. To make matters worse, the diff did not hang level due to the available place to put the chain block. Fearful of breaking a stud again, I wriggled the diff onto the studs with GREAT difficulty. Then when I could get some nuts on, managed to gently pull the housings together without undue force. Except for the out-of-line stud which leaned over a fair bit but, to my relief, still pulled down tight. Another stud was way too close to the housing to get a nut on. And the housing has not been spot-faced to seat the nut.

Image

I went with sealant only, not wanting to try to get a gasket into place undamaged.

So now it is properly bolted down, including the 4 conical "cleats" that were missing.

It was a another whole 'can of worms' getting the upper torque rod bracket to line up on its' studs. That took about an hour of jacking and pulling the axle housing with the chain block. What a pain!

I have changed my mind. Next time I will pull the tandem out from the truck. It was very hard to get things right during, what I found to be , a difficult assembly. Yeah, it can be done, but what a pain!!!

Next is re-pack the wheel bearings and dis-assemble the universal joints for inspection.

Have a nice day.
Sam.


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