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John Deere Tractors Discussion Forum
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1949 Model M transmission oil contamination - how clean

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mr.precision

01-26-2023 08:19:34




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Purchased a really nice Model M a month ago. Transmission had water contamination, as expected.

I drained the milky fluid out, flushed with 1 gallon of diesel oil and drained that, added a gallon of motor oil to act as a flush. Still had quite a bit of contamination when drained.

Let sit for 2 weeks with drain plug open.
Added 1 gallon of GL-4 85/90 wt gear oil. Drove it around - still milky and some foam apparent.

Is there more than one drain plug? Per my factory shop manual, there is only 1 drain plug. And, the capacity is 6-1/2 quarts. Cannot add more than 4 quarts before full to the filler plug.

Looks like I will drain it again. Looking for suggestions. Maybe pull the shifter cover? Seems like 2-1/2 quarts of crud still in there, or I am not getting everything out.
Quality GL-4 isn't cheap, and I'd like to figure this out before buying more fluid.

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mr.precision

01-27-2023 14:58:09




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Thanks, M-Man. I was hoping I wouldn't have to pull off the belt pulley attachment as it is pretty heavy for me to manage. I agree the buildup on the bottom should be left alone.... but it is clearly retaining some of the contamination behind it so not sure how will get that out. Might try to lift the rear of the tractor and see if that makes any difference.

I'll try another gallon of cheap motor oil and see if that will stir things up enough to get the water/oil mix out.
Will post a few pictures of progress. GL-4 gets more expensive every time I buy it.

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M-MAN

01-27-2023 15:19:58




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-27-2023 14:58:09  
Park it with the nose downhill and let it sit a week and drain the water off. It will settle to the bottom.



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M-MAN

01-27-2023 08:53:13




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
There's no easy way to clean that tar out of the bottom. Pulling the back cover is the only way you're getting it out. Only reason to pull the top is for final flushing with a pressure washer or solvents after you drag out what you can from the rear.

I changed the oil in mine last year. Like you it didn't take near as much oil as it was supposed to to refill. I figure that tar buildup laying in the bottom isn't going to hurt a thing. The oil is where it's supposed to be and that's what matters. I crack the drain plugs in all my tractors at least once or twice a year and let the water out. Even with a good shifter boot you will get condensation and have to do it again.

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mr.precision

01-27-2023 07:36:03




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Quoting Removed, click Modern View to see

On second thought, maybe first step is to take off the shift cover. I am 70 and that belt pulley looks pretty heavy.

Can you see the bottom of the diff with the shift cover off?



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mr.precision

01-27-2023 05:57:43




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Yes, drove it around with the diesel flush.
Good idea about removing the belt pulley assembly and trying to clean the diff area. Hadn't though about that.

Already did the final drives - they were fine, No water, just that black lubricant I have seen many times in old tractors.

I presume taking off the belt pulley is not big deal. Will that allow a good view of the diff and any crud left in there?

Thanks for the help.

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Rich'sToys

01-26-2023 21:16:04




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Did you drive it around a little with the diesel fuel in it? Sometimes that helps.



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M-MAN

01-26-2023 18:12:33




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Let it sit a week and crack the drain plug until the water seeps out and tighten it back up. Use it some and do it again. You should do the finals too.



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Glen D Anderson

01-26-2023 16:32:55




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 Re: 1949 Model M transmission oil contamination - how clean in reply to mr.precision, 01-26-2023 08:19:34  
Perhaps there is a build up of sludge preventing the oil from draining back from the differential portion of the transmission housing.

You could try jacking the back of the tractor up and see if more oil drains out?

If inclined you could remove the shifter cover and rear cover in order to do a better job by manually scrubbing with solvent and a brush or rags.

If it's been that neglected, no amount of "flushing" will get that crud out of there IMHO.

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