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Old 10-09-2010
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Oil drain on Universal M4-30

My M4-30 has an oil drain hose attached to the bottom of the crankcase.
There is a threaded plug at the outlet end of this hose. When I unscrew the plug and insert my sucker hose, I don't get anything out of it.

I can see that the attachment point for this hose has a thin hex nut on it. I am guessing this is a valve. The engine owner's manual is no help.

But I would like to hear from someone who knows, since if I am wrong I will have to deal with 4 quarts of dirty oil in the bilge.

Thanks for any help on this one...
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Question

That hose, formerly an option on Universals, is nowadays standard.
Our '88 had the option. It always worked but seeped some oil around the hose connection, so several years ago I replaced the hose on the "banjo fitting." I had to source a new pair of composite flat washers for the banjo too, as I recall.

If you put your sucker hose clear to the bottom where it would meet up with the machined 90 turn inside that banjo fitting, and you push it down hard, it could easily make a seal against the inside of the machined metal fitting and you would not be able get the oil out.

You might try pushing the oil suction tube down as far as reasonable and then pulling it back about an inch or so. Should start picking up oil with no problem. If not, then it's probably time to take the fitting off, mess and all, and refurbish that system. Of course this will involve getting an end wrench under a place you can not view without a mirror!
(One of those "bore o scope" gadgets might be a help...)

Good luck!

L

Last edited by olson34; 10-12-2010 at 09:31 AM.
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Old 10-09-2010
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If the insertion hose is sucking air wrap the joint where it enters the drain hose with electricians tape to make it air tight. Don't forget to remove the oil cap and warm the oil before trying to suck it out..
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Quote:
Originally Posted by pegasus1457 View Post
....I can see that the attachment point for this hose has a thin hex nut on it. I am guessing this is a valve.....
I'd be surprised if that's a valve... it's likely just the bushing for the original plug.

Sounds like the hose is plugged somehow if you can't pull out the oil.. as MS says make sure it's warm.
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Quote:
Originally Posted by Maine Sail View Post
If the insertion hose is sucking air wrap the joint where it enters the drain hose with electricians tape to make it air tight. Don't forget to remove the oil cap and warm the oil before trying to suck it out..
Good point, Maine (as usual). The oil was warm, but I had not yet opened the fill cap. I was not sucking air, just nothing moved.

In the end I stuck my sucker hose down the dipstick hole and got the job done -- after opening the fill cap.

Next time I will open the fill cap and try the drain hose again. [The dipstick on this engine is located at the most impossible place imaginable. Its location might have made sense when this engine was on a tractor. I find its hole by the Braille method, but only because I had previously taken photos from behind the engine with the dipstick inserted.]


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