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Old 11-15-2019, 10:07 AM   #21
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I'll get some photos today and post later. I have never posted photos so it will be a challenge

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Old 11-15-2019, 12:09 PM   #22
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Lots of good advice and information. Thank you all for contributing.
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Old 11-15-2019, 01:11 PM   #23
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My plan is to add a banjo bolt or valve on the oil pan and run a hose to a convenient place on the engine and use a pump to suck the oil out in to 5 gallons buckets.
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Old 11-15-2019, 02:02 PM   #24
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I have a hose attached to the drain plug of the Lehman and generator with a threaded connection on the end capped when not removing oil.

I use a vacuum pump mounted to a propane tank to suck the oil out. The pump creates vacuum in the tank and when I attach the tanks hose to the drain lines on engine or generator, it sucks the sump dry.

The propane tank holds 5 gallons and when full, reverse the pump connection, pressurize the tank and the oil gets pushed into a container for disposal.

Suction is a lot less messy since any leaks gets sucked in instead of out.
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Old 11-15-2019, 03:02 PM   #25
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I plumbed all my oil pans (2 mains, 2 generators) to a small gear pump and then to a holding tank. The holding tank has a deck fill and a commercial fuel dock would pump out the tank. Now I centrifuge my oil and the holding tank feeds the centrifuge.
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Old 11-15-2019, 05:04 PM   #26
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I was looking for a small hand crank gear pump, what did you find?
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Old 11-15-2019, 09:10 PM   #27
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Lots of ingenuity!
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Old 11-15-2019, 09:46 PM   #28
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I was looking for a small hand crank gear pump, what did you find?


https://www.ebay.com.au/b/Drum-Barre...69/bn_78211735
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Old 11-16-2019, 01:36 AM   #29
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We repurposed a Marco gear oil pump to be our oil change pump. It is a home built version of the Reverso system. From the pump location I can empty my main engine oil into 5 gal buckets sitting on my salon floor - the pump suction lines are connected to the respective engine oil pan drains. I then carry those buckets off the boat and empty them into the oil recycling tank at my marina.

This pic was before we plumbed in the genset oil for pumping out, only the two mains were attached at first...(we've also dressed the bare exposed wood on that backer board!)

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Old 11-22-2019, 06:12 PM   #30
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Reverso to pump both engines and transmissions into the old oil containers we filled with, then pump the new oil into. Easy, fast and no mess. Just hit the switch.
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Old 11-22-2019, 06:18 PM   #31
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I have a system like fractal. Used oil is pumped into the main fuel tank and burned....(filtered to 2microns before the daytank.)
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Old 11-22-2019, 09:19 PM   #32
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Agreed on the Reverso! Makes removal very clean and easy. However, I don't use the Reverso to put new oil in, as there will be a residue of old oil in the hoses and I want "clean oil" going in. Probably "overkill' but that's how I do it. Using a large funnel and pouring slowly I don't spill much (if any) when filling. I also use the large zip lock bag for removing the oil filter. Usually don't spill at all.
Reverso system here as well for engines and genset. oil discharge is handled thru three 5 gallon containers which I empty into our marina recycling tank. I add the clean oil (5 gallons) per side for engines via a funnel 1 gallon at a time to avoid spills. The oil filters are easy on my Volvo engines as they are mounted upright and drain down into the block. Engines are easy, just need to remember that the genset has its own open/shut valve for discharge
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Old 11-22-2019, 09:33 PM   #33
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I have a hose attached to the drain plug of the Lehman and generator with a threaded connection on the end capped when not removing oil.

I use a vacuum pump mounted to a propane tank to suck the oil out. The pump creates vacuum in the tank and when I attach the tanks hose to the drain lines on engine or generator, it sucks the sump dry.

The propane tank holds 5 gallons and when full, reverse the pump connection, pressurize the tank and the oil gets pushed into a container for disposal.

Suction is a lot less messy since any leaks gets sucked in instead of out.
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Old 11-23-2019, 01:22 PM   #34
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Okay, here's a technique I've used for several years and it makes the oil drain very easy, using the engine to drain its own oil. I tap into the engine oil system (most any engine has a 1/8 pipe thread port somewhere) and put a needle valve on it. I use a length of 1/4 nylon line into a drain bucket. With the engine idling I open the valve and catch the oil. Where there is a sign of oil pressure dropping, either reduced oil flow or the oil pressure horn I shut the engine off. Done. Yeah, it doesn't drain as much as other methods, but it drains most all of it. Close enough.
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Old 11-23-2019, 04:48 PM   #35
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Okay, here's a technique I've used for several years and it makes the oil drain very easy, using the engine to drain its own oil. I tap into the engine oil system (most any engine has a 1/8 pipe thread port somewhere) and put a needle valve on it. I use a length of 1/4 nylon line into a drain bucket. With the engine idling I open the valve and catch the oil. Where there is a sign of oil pressure dropping, either reduced oil flow or the oil pressure horn I shut the engine off. Done. Yeah, it doesn't drain as much as other methods, but it drains most all of it. Close enough.
I don't get it. Why is this easier than draining from the oil pan drain, other than not needing a pump. On a lot of trawlers, there is room under the engine to place a pan to gravity drain.

And draining all the oil out from the pan removes contaminants that have settled to the bottom of the pan that the engine oil pump pickup can not reach.
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Old 11-23-2019, 05:39 PM   #36
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With my portable pump. I can literally drain the 22 quarts of oil from my engine in 4 minutes. What takes some time is reinstalling the starboard oil filter which is pretty tough to get started threading on.
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Old 11-24-2019, 07:22 AM   #37
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For smaller engines the hand powered vacuum setup is fast and requires no installation.

https://www.amazon.com/slp/best-oil-...hagxfusm5sz83f

Plan B takes even less storage area , stow it in a plastic bag.

https://www.walmart.com/ip/Arnold-Si...SABEgKl0vD_BwE
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Old 11-24-2019, 07:37 AM   #38
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I use one like this, through the engine's dipstick tube:

https://www.amazon.com/DasMarine-Ext...4598901&sr=8-3

Make sure the oil is warm to make it easy to pump.
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Old 11-24-2019, 09:20 AM   #39
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Originally Posted by garycasey View Post
Okay, here's a technique I've used for several years and it makes the oil drain very easy, using the engine to drain its own oil. I tap into the engine oil system (most any engine has a 1/8 pipe thread port somewhere) and put a needle valve on it. I use a length of 1/4 nylon line into a drain bucket. With the engine idling I open the valve and catch the oil. Where there is a sign of oil pressure dropping, either reduced oil flow or the oil pressure horn I shut the engine off. Done. Yeah, it doesn't drain as much as other methods, but it drains most all of it. Close enough.
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Old 11-24-2019, 09:51 AM   #40
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Syjos makes a couple of good points. Yes, if the engine weren't at the bottom of the boat it would be easy to simply drain the oil into a bucket. Most big (trawler size) engines are installed with a drain hose already plumbed to the sump drain, so that is the obvious thing to use. And I'll admit that I've used this method mostly with sailboat engines, which are much smaller. Same principle is involved, though. As far as the sludge (contaminants) that are on the bottom of the sump I'm not sure draining the oil is much different that sucking it out with the engine pump If the crud won't flow to the pump suction I'm not sure it will flow to the drain port either.
Bottom line is, I think, if you have an engine that doesn't have a drain hose, my method is a good alternative to sucking oil out through the dipstick tube. All the hardware stays with the engine and all you need is a bucket.
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