Engine oil extraction

[Lift12]

I cannot reach the engine oil drains on my twin 1989 5.7 Mercruisers. What are my options to change the oil? They are equipped with remote filters. I am aware of pumping the oil out through the dipstick but have no experience with this. Is this an effective method? I appreciate your expertise.

 

[Scott Danforth]

the ONLY way in 99% of the cases is to suck thru the dipstick

unlike a car dipstick tube that only goes 1/2" thru the block, a marine motor dipstick tube goes all the way to the bottom of the oil sump.

unless you pull the motors to add remote oil drain hoses, suck the oil thru the dipsticks.

 

[tank1949]

I cannot reach the engine oil drains on my twin 1989 5.7 Mercruisers. What are my options to change the oil? They are equipped with remote filters. I am aware of pumping the oil out through the dipstick but have no experience with this. Is this an effective method? I appreciate your expertise.

Go buy a cheap Harbor Freight (120 vt ac ) pump. You may have a threaded fitting on the top of dip-stick tube. Pray you do. You may have to buy brass interface for your pump to connect to dip stick tube's fitting. Mine have remote filters too and a special hose connected to suck out oil. I am surprise that your remote oil filter systems doesn't have this as well?

 

[zellerj]

This garden hose adapter will fit on the threaded tip of the dip stick. If you put black tape around a piece 3/8 inch tubing so it fits snugly into the 3/4 inch opening, you can hook it up to any pump you want. But I use a Topsider. Takes about 3 minutes to suck out hot oil.

 

[Scott06]

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

i use this vacuum extractor, worked great. You can reverse it to pressure the extractor and pump the used oil into containers for recycling. Comes with several different diameter suction hoses one fit right down dipstick on mine

 

[Lift12]

Thank you!

 

[TyeeMan]

Xs 2 on the vacuum extractor! That thing is the best thing since sliced bread! I've had a few electric pumps specifically for this purpose and they aren't worth the plastic they're made of. They usually result in oil leaking onto your carpet and other problems.
With the Mighty Vac, make sure the oil is warm, run the hose all the way down the dipstick tube, give it 3-4 pumps and watch the oil come out. A few more pumps will be required to drain the entire sump.
The vacuum extractor I purchased came with a couple different hoses and a brake bleeder kit which I've used a few times.

 

[JASinIL2006]

I bought a $25 small wet/dry shop vac from Wallyworld and duct-taped a section of garden hose on it that screws onto the threads at the top of the dipstick. It works very well and has lasted longer than the $90 handpump oil extractor I bought. For the one time a year I use it -- only when I winterize the boat -- I can put up with its rather rough appearance. Takes about 10 minutes to extract the oil from my 350 Mag (assuming the engine was warmed up first).

 

[tpenfield]

Some plastic tubing connected to the dipstick tube and a manual pump. Works pretty well

 

[wingless]

This custom high-volume high-pressure five-zone oil change system was designed and installed by me on my boat.

It sucks the eight quarts out of my engine sump in ten seconds for a true five-minute oil change.

The oil pan sump drain plugs were replaced w/ banjo bolts. I was able to do this w/ the sumps full of oil w/ no mess. I used large-diameter fittings and plumbing and a gear pump. I change my oil HOT, after usage of the boat, before it cools down.

 

[Scott06]

What gear pump was used ?

 

[Scott Danforth]

This custom high-volume high-pressure five-zone oil change system was designed and installed by me on my boat.

It sucks the eight quarts out of my engine sump in ten seconds for a true five-minute oil change.

The oil pan sump drain plugs were replaced w/ banjo bolts. I was able to do this w/ the sumps full of oil w/ no mess. I used large-diameter fittings and plumbing and a gear pump. I change my oil HOT, after usage of the boat, before it cools down.

the hydraulic engineer in me and the gear head in me just had a nerdgasm

 

[GA_Boater]

The oil pan sump drain plugs were replaced w/ banjo bolts. I was able to do this w/ the sumps full of oil w/ no mess.

How did you manage that with a full sump and no mess?

the hydraulic engineer in me and the gear head in me just had a nerdgasm

The Scotsman in me just had a stroke.

 

[wingless]

What gear pump was used ?

The part i used is not currently offered by Reverso.

This pump appears to have the same gear pump, but a larger motor.

The oil pan sump drain plugs were replaced w/ banjo bolts. I was able to do this w/ the sumps full of oil w/ no mess. I used large-diameter fittings and plumbing and a gear pump. I change my oil HOT, after usage of the boat, before it cools down.

How did you manage that with a full sump and no mess?

Planning.

A sheet of newspaper was placed under the engine, w/ the edges curled up.

The sump drain plug was removed and the opening quickly obstructed w/ my thumb.

The thumb was removed and quickly replaced w/ the banjo bolt, w/ all ports plugged.

The appropriate port was removed and the thumb again called into duty.

A manually plugged hose barb was screwed into the port.

The plug was removed and a hose jammed onto the barb.

Then everything was "easy" by maintaining the open hose end above the sump.

​​​​​​​The amount of all dripped onto the newspaper was small, not overflowing the paper.

 

[Lou C]

Wingless you are amazing, I have followed your Jeep mods/repairs etc as well.

For us ordinary folk as long as you have the garden hose thread on the top end of the dipstick tube which most modern inboards have, you can use any of the vacuum pumps as long as you fab up the female adapter as show above. I've been using the Topsider for approx. 15 years and it works great, the garden hose thread adapter works much better than snaking the thin tube they give you down the dipstick tube....
I use this oil changer on all my 4 stroke yard equipment its far less messy than trying to use the drain plugs on most of the Briggs engines (I have 4 of those lol).