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Old 17-01-2010, 12:02   #31
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Hadn't thought of that. I'll have to check the manual for the 3QM30 to see if that's true for the 2-generations older model as well.

Thanks.
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Old 17-01-2010, 12:35   #32
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Hadn't thought of that. I'll have to check the manual for the 3QM30 to see if that's true for the 2-generations older model as well.

Thanks.
As far as I know, the QM and GM need to have the suction tube put down the dipstick tube.
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Old 17-01-2010, 12:49   #33
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Nope.It doesn't run without oil, just PRESSURIZED oil.


When you start a car, it's got no oil pressure for a few seconds, and all the oil has had time to drain away from bearings etc. That's got to be worse than running an engine with oil pressure when the pressure is all of a sudden gone for a few seconds. At least the oil film is still there.
I'll agree with you on that one.

When I start my engines, I first crank while pulling out on the shutoff, until low pressure alarm cuts off. If it has been more than a few days since the engine has last run, I'll do this with the decompression levers thrown. Then put things back in order, and start engine. Surely this is better for the engine. The engine is being rotated just the same, but the forces from combustion aren't there, nor from compression, if the levers have been thrown.

This isn't the first i've heard about removing the oil this way, and I'm sure it can be done safely if you are careful, but I'm not ready to do away with pumping out the oil by hand. Not much margin for error.

Imagine mentioned earlier about the Jabsco hand pump. That's what I use, with a 2 inch long discharge tube stuck into the mouth of a 1 gallon oil jug. I can hold the pump and the handle of the jug together in one hand.

But after 5 years I wanted to replace the pump. Unfortunately, what they make today is not as good as my old one. The pump head (the intake end)is made of red plastic/rubber whereas the old one was black. The red seems to be effected by oil--in short order. I think I could use it once before it went bad. I'm still using my old one, and am on the lookout for a new system.
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Old 06-04-2015, 12:14   #34
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Re: Yanmar 3YM30 Oil Drain Location?

Does anyone know what the thread size is for the oil pan plug. I'm thinking of replacing it with a Fumoto Qwik Valve and hose for easier oil changes.
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Old 05-11-2015, 15:05   #35
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Re: Yanmar 3YM30 Oil Drain Location?

Hi,
I'm sure I'm going to look dumb with this question. I have always followed Yanmar's instructions to the letter re changing oil on a 4 year old 3YM30: ie., pumping it out (warm) through the dipstick pipe. The last two years I've noticed, once I add new oil and check the level (and yes, after fitting a new filter), the oil is virtually as black as the old stuff. Is this normal? Or am I doing something wrong? There seems to be a nut on the starboard side of the oil pan, which I hesitate to fool with since it's not mentioned in the manual at all. Has anyone tried draining through that? Thanks!
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Old 05-11-2015, 16:14   #36
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Re: Yanmar 3YM30 Oil Drain Location?

First, you run the engine to get any solids that have precipitated out back in suspension so they will drain out with the oil. It's nice to have the oil warmed up

2nd, even cars are getting away from drain plugs. Try and find a drain plug on a new car's transmission and you will be very frustrated.

Easiest way to change the oil is with a self contained suction pump/tank. Just put the tube down the dipstick, give the tam pump a few strokes and walk away while it does its thing. Take the pump/tank to the recycle and either pour the old oil or flip am a e and pump it out. A really neat clean way without having to worry knocking over a bike of oil or some other catastrophe.
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Old 06-11-2015, 06:58   #37
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Re: Yanmar 3YM30 Oil Drain Location?

Yes, the suction pump is good, but you didn't really answer the question about the oil being black immediately after a change.
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Old 06-11-2015, 07:36   #38
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Re: Yanmar 3YM30 Oil Drain Location?

On my 3GM30F, I run the engine to get it warm before changing the oil, but don't get too hot or you will melt the pickup tube. Mine is always black just after changing and I change filters every time I change the oil. Diesel oil is a detergent oil and that is why it is black I'm told.


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Old 09-11-2015, 20:40   #39
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Re: Yanmar 3YM30 Oil Drain Location?

Thanks for the replies re the black oil after changing on the 3YM30. Your information is truly appreciated. ... It sounds like dipstick pumping is the accepted method for changing oil, as opposed to messing with drain plugs. It also sounds like, since my new oil is still black, I'll have to change the oil a second time--but given that she's all buttoned up for the winter, and I don't have access to water in the storage yard to run the engine for long enough to warm things up, I'll have to wait till spring.
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Old 10-11-2015, 09:54   #40
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Re: Yanmar 3YM30 Oil Drain Location?

Don't know why but diesel oil turns black after very short engine run time after an oil change. So black oil seems to be normal. Maybe somthing to do with a more effective way to mark its territory.


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Yes, the suction pump is good, but you didn't really answer the question about the oil being black immediately after a change.
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Old 10-11-2015, 10:10   #41
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Re: Yanmar 3YM30 Oil Drain Location?

Greetings and welcome aboard the CF, Rocco, & Oddysey.
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