Yanmar 3YM30 Oil Change

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KAM

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Been having a lot of trouble getting the Pela to pull the old oil up through the thin black tube supplied. Does anyone know if the Yanmar dipstick tube goes right to the bottom of the sump. Could I attach a larger diameter tube to the top of the dipstick tube and suck the oil out through that. Also has anyone fitted a Beta type pump to a Yanmar.
 
KAM said:
Been having a lot of trouble getting the Pela to pull the old oil up through the thin black tube supplied. Does anyone know if the Yanmar dipstick tube goes right to the bottom of the sump. Could I attach a larger diameter tube to the top of the dipstick tube and suck the oil out through that. Also has anyone fitted a Beta type pump to a Yanmar.
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i very much doubt that the dip stick tube extends beyond the top of the crankcase, does it not have a sump bung.
 
Yes I usually do it after the engine has been running in service for several hours. I have never had much success with the Pela. It usually takes half and hour and hundreds of pumps. The joints on the Pela are not proper vacuum seals. I've been doing it for many years but there must be a better way. As usual the sump bung is not accessible pumping up through the dipstick tube is the usual way.
 
KAM said:
Yes I usually do it after the engine has been running in service for several hours. I have never had much success with the Pela. It usually takes half and hour and hundreds of pumps. The joints on the Pela are not proper vacuum seals. I've been doing it for many years but there must be a better way. As usual the sump bung is not accessible pumping up through the dipstick tube is the usual way.
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a pela is "pre vacuumed" why all the pumping
 
It seems to loose the vacuum quickly after I stop pumping and long before the oil is out. Maybe the newer ones are better designed. I used to work with vacuum systems and my opinion is that the way the pela is designed it's unlikely to hold the vacuum for more than a few minutes.
 
The Beta arrangement has the pump connected permanently to the sump via a flexible tube and shut-off valve, so some "engineering" would be required.
When I owned a 2GM20 I pumped the oil out with a small brass pump, available from many chandlers. That worked OK, but, despite care, it was always messy, so the Pela was a welcome improvement.
I find that the Pela will hold a vacuum for a good length of time and doesn't need much repeated pumping.
 
My Pela does not seem very effective. Was wondering if there is something missing. Never had any instructions. The youtube videos seem to have a lot of pumping going on. The pump seal just seems to be a rubber ring onto a simple flap valve. The suction tube is just push fits with a tapered red cap. No O rings as far as I can see. There is a lot of hissing and gurgling indicating plenty of leaks. Cant help thinking its more effective to pump the oil.
 
KAM said:
The pump seal just seems to be a rubber ring onto a simple flap valve. The suction tube is just push fits with a tapered red cap. No O rings as far as I can see.
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Yes, that's just as mine is. Clear length (2 actually - one small and one larger diameter) of plastic tube, with a black cap which pushes into the vessel itself. Once in, just a few pumps and it works for me. No hissing. Perhaps you have a leak somewhere around the top cover or actual pumping handle? I think you will have to experiment on shore, where you can perhaps see what is actually going on.

Geoff
 
Last time I had my Yanmar serviced, the engineer just attached his sucker to the top of the dip tube, he told me it went to the bottom of the cranckcase
 
You can push the Pela tub (which is only a bicycle brake cable outer) all the way until it touches the sump pan. You must withdraw it slightly, or the end of the tube is blocked and cannot suck up.
As everyone says, warm the engine by running it for 15 mins, this also helps oil to drip out of the galleries at the top of the engine.

My Pela is about 10 years old, and needs to be pumped 12-15 strokes twice during emptying, which takes around 5 minutes.
 
I have a brass handled pump fitted permanently to my 3YM30, and it works brilliantly for oil changes - I just remove a blanking nut, fit a tube and start pumping into an empty plastic container. Unfortunately it was fitted from new so I can't tell you what make the pump is or how to do it, but it is a very neat arrangement.
 
Thanks for the comments are you getting good flow even when using the thin black tube. Does anyone have any diagrams or instructions for the Pela.
 
I don't have a black tube, just the two lengths of RIGID clear plastic tube, which fit into each other. I have to use the two to have a long enough length of tube. Other than pushing the one end of the tube into the pump vessel, and the other into the dipstick hole, there aren't really any other instructions other than to pump several times to create the vacuum. Do make sure your delivery/suction tube is rigid, or it may collapse, and then you wouldn't be able to suck out the oil.


So make sure that the oil is very warm. Cold oil would be difficult to remove in my opinion.

Geoff
 
I had similar problems when first using my Pela, so much so that I thought something was wrong with it.

Two issues. First, the thin black tube is far too long. Second, it was very easy to push the tube so far in that it curled back up the sump so the end was above the oil level.

So, shortened the black tube and now just push it in just enough to suck out oil. Now works a treat and just takes about 5 mins to suck out approx 2 litres oil (2GM20) with occasional pumps after the first initial pumping

As already said, above assumes 15/20 min warm up before starting.
 
I use a brass hand pump. It has a rigid-ish clear plastic tube that fits down the dipstick tube. The end of the tube is cut at 45°.

It holds 2.8L of oil according to the manual. I can pump out a bit more that 2.5L before air comes up.

Is that reasonable? Should I worry about the 0.3L still in there? I have wondered if a more flexible pipe would reach further.
 
we find it worth pumping to create the vacuum then checking with finger or ear that the suction is working before feeding tube down dipstick hole and making sure it is in the oil - have found sometimes that gunk has blocked the pipe and have had to clear it else much pumping - no sucking!
 
Thanks for the info seems that they work OK. First job for today is to service the Pela before the engine!
 
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