halftrackinfo
drive train => front and rear differentials => Topic started by: col.halftrack on May 19, 2012, 10:17:02 AM
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I am getting ready to put a rear axle under the M4A1. The manual says you can pull the pinion assembly by removing the six bolts holding on the pinion seal flange. I removed the flange nut and noticed the keyway has been sheared allowing the flange to slip twenty degrees out of line. A standard two jaw puller with heat added has failed to pull the flange so I am wanting to pull the pinion assembly and try pressing the flange off. Pinion assembly pulled out about one half inch and seems to be held. Before I start prying and beating anyone done this before and have some ideas?
Thanks
Kevin
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Kevin,
It sounds similar to the front axle, I just did mine and the same thing happened. The pinion did not come out, it was hanging up on the ring gear. I have my rear diff out but I will not be able to take a look at it until tuesday.
Gary
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Kevin,
the pilot bearing looks like it will hit the ring gear when you go to pull out the pinion, thats what happened on my front diff. I was splitting the axle in half so it didn't matter. It looks like you will have to pull the ring gear out first to get the pinion gear out. I can post some pictures if it helps.
Gary
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Kevin, If I remember correctly there is room to do this. Take a 5 lb sledge and put it on one side of the collar where it slides over the pinion shaft and use a 3lb to hit on the other side working back and forth a little may be the trick you need to get that off. The shaft is tapered so a little work on the sides should get it to break loose.
Steve
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i also had 2 of those that sheared the keyway.
one was loose but the other was just about welded in there. i used heat but nothing worked. i had the option of using a different one so its still stuck.
i think if i was going to try pull it again i would do as you mention. pull the whole 3rd member and put it in a press. pullers are to hard on the flange, you will end up bending it.
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Does anyone have a source for the cork gasket (ORD A214939) and/or the differential carrier gasket (ORD B184319)? Thanks, DW
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Do you have a picture of the cork gasket?
The carrier gasket should be available from a heavy truck parts shop. As it is the same carrier as used on some older model trucks.
Steve
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The rear pinion cork gasket picture in the parts book doesn't have a lot of definition. Unfortunately the old cork gasket I have ended up in pieces; however, the gasket is around 4.54" OD x 4.145" ID x .400 wide. Does that ring a bell with anyone?
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here is some material.
1/2"
http://www.mcmaster.com/#9487k5/=101zbjw
3/8"
http://www.mcmaster.com/#9487k8/=101zbnc
i don't have the specs on this seal but going by what dwhite posted you may be able to use rubber o ring material.
to make an o ring out of ring material you cut it to length with a razor and super glue the ends together. this is done even in hi pressure systems.
not sure if this is the right size
http://www.mcmaster.com/#9407k17/=101zdg6
or
http://www.mcmaster.com/#1034t5/=101zhjh
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I'm pretty sure all the NOS gaskets are dried out just like the valve cover and oil pan gaskets. I received an NOS one a couple months ago, and it was fragile and broke in a couple places. I still ended up using it and just sealed the breaks with RTV.
Hopefully it holds up.
I'm guessing you're better off making a new one if you can...
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i may have misread the measurements dwhite listed. he listed .40 wide and i used that as the thickness.
anyways mcmaster has sheets cheap
here is some 1/8" I'm not sure what is required.
http://www.mcmaster.com/#9487k3/=1022rsp
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I'm pretty sure all the NOS gaskets are dried out just like the valve cover and oil pan gaskets. I received an NOS one a couple months ago, and it was fragile and broke in a couple places. I still ended up using it and just sealed the breaks with RTV.
Hopefully it holds up.
I'm guessing you're better off making a new one if you can...
I have new made valve cover and oil pan gaskets. These are fresh made and ar not NOS if interested. I also have complete engine and transmission gasket sets that are made fresh, not NOS.
I think I had the same problem with my NOS oil pinion seal. It feel apart when installed. I believe the repair shop used some silicone or something instead.
Steve A.
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I appreciate the input that y'all have provided. I ended up going with 3/16 square o-ring stock (McMaster #9700K13) and superglue. It took me a couple of tries, but if you cut the circumference about 1/2" small, glue, and then stretch the o-ring in place you'll end up with a good seal. Total investment: $4. DW