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| Rear Differential drain plug | Rate Topic |
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| Posted: 03-30-2018 04:27 pm |
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1st Post |
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Ralph H Member 
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Anybody out there have the name of the guy that designed the rear differential without putting in a drain plug? Like to meet him out behind the ball diamond tonight. Seems like a basic to me. I wanted to change the rear diff oil as it has sat for 35 years. No obvious drain plug to me did I miss it? I did managed to suck out about half (3/4 of a liter) with my air operated brake bleeder vacuum pump. and this took half an hour. Must be an easier way. any comments appreciated.
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| Posted: 03-30-2018 06:07 pm |
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2nd Post |
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redracer Member
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sorry about your problem; we usually drain it by taken off the cover plate. Putting new sealing compound on the mating surfaces is straightforward even if you don't use a new gasket(which can be cut easily from Mr. Gasket material). Just be sure to NOT use silicone
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| Posted: 03-30-2018 06:20 pm |
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3rd Post |
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Ralph H Member
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yea that would work of course but wouldn't a plug be the way to go for a quick oil flush and change. drain out any contaminants, moisture, filings, and guck. A plug would be not nearly as messy, quicker, less prone to failure if it does not seal........ Seems like a lot of trouble could have been averted for what is a basic service issue. I am going to look at my spare diff and look at tapping in a drain plug. Last edited on 03-30-2018 06:21 pm by Ralph H |
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| Posted: 03-30-2018 06:23 pm |
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4th Post |
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redracer Member
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No argument from me on that, but it's certainly not as horrendous as shimming the valves(wish they had done it like the Fiats, where one wouldn't have to remove the entire cam housing)
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| Posted: 03-30-2018 06:25 pm |
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5th Post |
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Ralph H Member
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Has anybody ever tapped a drain plug into the diff body or even the lower edge of the diff cover does not need to be large - 3/8 plug or even a 3/8 drain cock fixed in place. Comments Last edited on 04-01-2018 04:19 pm by Ralph H |
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| Posted: 04-02-2018 07:38 am |
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6th Post |
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answerman Member
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I don't know why you couldn't. I've seen people do it on Metropolitans for a fill plug: a common swap for the Met is the pumpkin from an early Austin-Healey Sprite or MG Midget, and the earlier Mets didn't have fill plugs on the rear diff cover so people would just weld one in there. Seems like the same thing in theory except you'd have to weld it low enough on the cover to actually drain all the fluid.
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| Posted: 04-02-2018 01:42 pm |
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7th Post |
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Ralph H Member
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Yea cannot see a reason why not to try. If it was on the cover it might not get all the fluid but enough to clean it up. nice thing is I have a spare cover and can be done off the car for a quick swap. drilling out the diff casing would be better for the drain aspect but lot more work.
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