What is the secret to getting all the oil out of the crankcase on a 2GM? I tried using one of those gastank type suction (brightboy or something like that)pumps and I don't get nearly enough oil out. This is a raw water cooled engine so it never gets hot enough to really thin out the oil. Is there a drain plug ?
- Status
There is no oil drain plug.
I removed the oil pan on mine and installed an oil drain plug and it works great. A fairly easy job to do. Most people do the best they can with some kind of suction pump through the dipstick hole. Run the motor first so the oil gets warm. You can get a bit better than half out. Truly a design flaw in the Yanmar engine. Change the motor oil in the transmission every few years also.
I removed the oil pan on mine and installed an oil drain plug and it works great. A fairly easy job to do. Most people do the best they can with some kind of suction pump through the dipstick hole. Run the motor first so the oil gets warm. You can get a bit better than half out. Truly a design flaw in the Yanmar engine. Change the motor oil in the transmission every few years also.
Try West Marine
I have had great success with a little pump/tank assembly from West Marine. This thing pumps out the oil and stores it in a tank that is part of the unit.
I have had great success with a little pump/tank assembly from West Marine. This thing pumps out the oil and stores it in a tank that is part of the unit.
Try this
Buy a brass rod at the hardware store that's just big enough to fit the dipstick hole. Attach it to the West thingy or your own pump using successive increases in clear plastic hose that's snug or glued together. Pump into a 24-urine plastic jug from any nurse. These are small enough to take the 2GM oil but have large apertures to put the pump hose in. They also measure by CCs, which compares well to the plastic oil can. I change oil after a full run, when it's nice and toasty. Be sure to change the filter every time you change.
Buy a brass rod at the hardware store that's just big enough to fit the dipstick hole. Attach it to the West thingy or your own pump using successive increases in clear plastic hose that's snug or glued together. Pump into a 24-urine plastic jug from any nurse. These are small enough to take the 2GM oil but have large apertures to put the pump hose in. They also measure by CCs, which compares well to the plastic oil can. I change oil after a full run, when it's nice and toasty. Be sure to change the filter every time you change.
I found that the Yanmar design flaw is because
the oil pump pickup is too close to the dipstick hole. The dipstick doesn't care because it doesn't have to go to the bottom of the pan. The oil suction tube does, but it hits the top of the pickup. I used to have a Ross oil changer that worked by opening an exit valve and letting pressurized oil out and into a jug while the engine was running. It installs near the oil pressure sending unit. Anyway, after I rebuilt the engine, I tossed the Ross.
(Sorry, I just thought that up) I went with those vacuum jugs. The secret to finding the bottom of the pan is to bend the leading end of the tube so that when it enters the pan it is curved and can be aimed to the bottom rear corner nearest the dipstick hole. What helps too is knowing how much oil is in the pan. Check it first with the dipstick and then see how much comes out. I keep telling myself that changing oil is fun!
the oil pump pickup is too close to the dipstick hole. The dipstick doesn't care because it doesn't have to go to the bottom of the pan. The oil suction tube does, but it hits the top of the pickup. I used to have a Ross oil changer that worked by opening an exit valve and letting pressurized oil out and into a jug while the engine was running. It installs near the oil pressure sending unit. Anyway, after I rebuilt the engine, I tossed the Ross.
(Sorry, I just thought that up) I went with those vacuum jugs. The secret to finding the bottom of the pan is to bend the leading end of the tube so that when it enters the pan it is curved and can be aimed to the bottom rear corner nearest the dipstick hole. What helps too is knowing how much oil is in the pan. Check it first with the dipstick and then see how much comes out. I keep telling myself that changing oil is fun!I use...
... an impeller pump chucked into my electric drill to get the oil out of my Yanmar 2GM20F. When the oil is warmed, I slide the small pick up tube into the dipstick hole and hit start. By moving the pick up tube around a bit while the pump is running, I feel sure I can get most of the old oil out by looking at the discharge bottle: 2 old litres out, 2 new litres go back in.
... an impeller pump chucked into my electric drill to get the oil out of my Yanmar 2GM20F. When the oil is warmed, I slide the small pick up tube into the dipstick hole and hit start. By moving the pick up tube around a bit while the pump is running, I feel sure I can get most of the old oil out by looking at the discharge bottle: 2 old litres out, 2 new litres go back in.
On my very first oil change, I removed the oil pan and drilled a hole and tapped threads into it that would accept a drain plug. Ever since, my oil change procedure is exactly the same as changing it on any car. Slide a pan under the engine, pull out the drain plug and let gravity do all the work. Put the plug back after it drains......done.
Alan, how do you handle the required flat pan?
Isn't it hard to remove from under the engine? And then the oil has to be transfered to a separate container suitable for transport. What do you do? "done" seems a little brief to me.
Isn't it hard to remove from under the engine? And then the oil has to be transfered to a separate container suitable for transport. What do you do? "done" seems a little brief to me.
Hot Oil
The trick is to get the oil hot so warm up the engine and get the oil hot a and it will flow much better also move the tubing down the dip stick hole. I like the idea of a drain plug and will be looking into doing just that. nick
The trick is to get the oil hot so warm up the engine and get the oil hot a and it will flow much better also move the tubing down the dip stick hole. I like the idea of a drain plug and will be looking into doing just that. nick
Fred
I use a one gallon anti freeze jug. I lay it flat and cut an opening in the side that faces up(about 3" square) and leave the fourth side uncut. Bend the flap open and slide it under the engine. When the oil is drained, tape the flap closed with good ol' duck tape(keeping the jug flat) and drop it off at any recycling place. The entire procedure takes 10 minutes and no mess.
I use a one gallon anti freeze jug. I lay it flat and cut an opening in the side that faces up(about 3" square) and leave the fourth side uncut. Bend the flap open and slide it under the engine. When the oil is drained, tape the flap closed with good ol' duck tape(keeping the jug flat) and drop it off at any recycling place. The entire procedure takes 10 minutes and no mess.
Do not think it was a design flaw....
Fred: While it may not be very convienent to pump the oil out thru the dip stick, I do not think it was any type of a design flaw. I believe that it was to protect the environment from idiots that would drain oil into their bilge. I have seen a kewl device that can be used in the place of a drain plug that allows one to attach a hose to the drain. I suppose that one could also use an on/off spigot and attach the hose to that too. Then one could actually pump oil out from the bottom of the engine which would make life much easier. Obviously getting the pan off is the first hurdle.
Fred: While it may not be very convienent to pump the oil out thru the dip stick, I do not think it was any type of a design flaw. I believe that it was to protect the environment from idiots that would drain oil into their bilge. I have seen a kewl device that can be used in the place of a drain plug that allows one to attach a hose to the drain. I suppose that one could also use an on/off spigot and attach the hose to that too. Then one could actually pump oil out from the bottom of the engine which would make life much easier. Obviously getting the pan off is the first hurdle.
Steve
Removing the pan is really very easy. First you will need to remove as much oil as possible "the old fashioned way". Then there are a series of 6mm bolts to remove, that's it. The pan drops down and you can put some paper towels under the block to catch a few oil drops. I did use a radiator petcock in place of a drain plug to make life even easier. That way no tools are required to do the job. I drilled the hole at the back of the pan because that is the lowest point of the tilted engine pan.
Removing the pan is really very easy. First you will need to remove as much oil as possible "the old fashioned way". Then there are a series of 6mm bolts to remove, that's it. The pan drops down and you can put some paper towels under the block to catch a few oil drops. I did use a radiator petcock in place of a drain plug to make life even easier. That way no tools are required to do the job. I drilled the hole at the back of the pan because that is the lowest point of the tilted engine pan.
AH HA! NOW THE TRUTH COMES OUT
LADIES AND GENTLEMEN OF THE JURY, that SIMPLE DRAIN PAN morphed into a specialty/custom made container with custom modifications! That simple DRAIN PLUG turned into a PETCOCK! Ladies and gentlemen, you must find the accused,,, pretty damn clever actually. The petcock is a favorite of mine too. I used one under the water maker prefilter housing so as to be able to drain yucky water prior to opening it. You can just see it under the filter housing. Good work Alan. Oh, case dismissed.
LADIES AND GENTLEMEN OF THE JURY, that SIMPLE DRAIN PAN morphed into a specialty/custom made container with custom modifications! That simple DRAIN PLUG turned into a PETCOCK! Ladies and gentlemen, you must find the accused,,, pretty damn clever actually.
The petcock is a favorite of mine too. I used one under the water maker prefilter housing so as to be able to drain yucky water prior to opening it. You can just see it under the filter housing. Good work Alan. Oh, case dismissed.- Status