DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,167
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Post by DynoDave on Oct 12, 2020 8:47:50 GMT -5
no, thats a ventilation system with a cap and also a threated to be used to hold the brake fluid dist block in place. The pic I posted got missed the cap. The next pic is how it looks with the cap installed The only way to drain the oil is removing the rear cover. The filler provision is on rear cover ( here a chromed one which shows clear the provision ) dunno what is that rubber you talk 1) And when you remove those cover bolts, 99.99% of the time, the cover stays stuck in place. You will have to pop it loose with a scraper. Be as gentle as you can so you don't bend the lip of the cover, making it hard to reseal. 2) Diff fluid stinks. If it soaks into your skill, you will be smelling it for days, no matter how much you wash your hands. I recommend thick black nitrile work gloves, like these from Harbor Freight. And work clothes you don't care about. HARBOR FREIGHT LINK3) Leave one last bolt in the cover before you pop it loose, at the very top. Loosen it, but don't take it out. This will hold the cover from falling into your drain pan until the fluid is done draining. 4) When you pry the cover open, start at the bottom. Once it starts to crack open like a clam, let it drain before prying it the rest of the way off. 5) You'll want to scoop out the old fluid from the bottom of the cast iron center section. A small dollar store spatula might help. 6) Inspect the interior. Anything look out of order? Lots of metal chunks in the fluid? Nasty looking wear on gears? Blueing from excessive heat? 6) Clean cover and housing, reseal and bolt it up. Tighten to spec. No need to have it crazy tight. 7) Fill through the fill hole in the cover, or in the side of the casting above the pinion (depending on design). Someone here can confirm, but I believe the fill hole is also the fill line. Fill it until a little starts to leak out the hole, then install the plug.
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Post by Nacho-RT74 on Oct 12, 2020 9:02:45 GMT -5
yeap... the fill limit is the hole itself or a bit less. It usually is just a bit over the bottom of axle tubes.
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Post by jeremy on Oct 14, 2020 14:40:18 GMT -5
Diff cover is off. It wasn't that bad - I was surprised at how little effort it took to break the bolts loose. What do they torque down to? Can't be much. I watched a YouTube video about removing diff covers before doing mine. It had the same instructions, leave the top bolt on and use a utility knife to cut the gasket loose. I hope the knife didn't tear up that gasket surface, but if the diff is iron I'm guessing it didn't do any harm. The gears look good to me. It amuses me to see those yellow marks on the gears, still there after 48 years. My cover does not have the nice fill hole in this chrome job - Also, I don't have a vent bolt holding that metal block on the end of the rubber brake tube onto the axle. What I have is just a regular bolt.
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,167
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Post by DynoDave on Oct 14, 2020 20:11:16 GMT -5
No vent / bolt through here? Check around the front of the cast center section. There should be a fill bolt.
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Post by Nacho-RT74 on Oct 15, 2020 5:28:10 GMT -5
Check around the front of the cast center section. There should be a fill bolt. this configuration is normally used by banjo tipe 3rd members ( 8 3/4" ) but the rest use the filling hole built into the rear cover. UNLESS THERE IS SOMETHING I DON'T KNOW on this LOL I would clean the cover... it could look like this ( It does seem with somehow of rubber cap over it ? maybe a later Jeep setup ): but hidden like your car or this which it seems invisible LOL I just used the chromed one just for a better vision, because all the pics I founds around are nasty with dust, rust grease LOL Mopar axle guide shows also the filling hole on cap thought
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Post by Nacho-RT74 on Oct 15, 2020 5:34:02 GMT -5
OH... and also, all the wet area around the brake fluid distribution block on axle it could be brake fluid too, not really gears oil
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Post by jeremy on Oct 15, 2020 9:36:42 GMT -5
DynoDave - This is the bolt that was holding the brake line to the axle. Nacho-RT74 - I've cleaned up the diff cover and there's no fill hole there. I haven't checked on the back side of the diff yet. I bet it's there. There didn't appear to be any seepage from the brake lines, or from the diff cover. It seems more likely to have come from the diff cover, because the bolts weren't torqued down very tight.
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,167
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Post by DynoDave on Oct 16, 2020 21:00:01 GMT -5
It looked all wet around this block. I wonder if, without the proper vent/bolt, if it was building pressure and leaking there?
Either way, I'd get the proper bolt for that.
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Post by jeremy on Oct 18, 2020 19:06:17 GMT -5
A sound theory. Have you seen the vent bolt anywhere?
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,167
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Post by DynoDave on Oct 18, 2020 19:38:25 GMT -5
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