Oil Change 1996 Mercruiser 5.0L

Silvio Ortega

Silvio Ortega

New Member
May 30, 2019
10
Chuluota, FL
Boat Info
Sea Ray
Engines
5.0L Mercruiser
My Sundeck 240 has a 5.0L Merc and I can't seem to pump out the oil. I have the Mercruiser hand pump and no dice. I bought an electric pump to pump out the oil and again nothing. This is done at the dip stick. Besides the obvious drain plug on the oil pan is there a remote drain for the oil on this engine? The compartment is tight and I don't see how I can get to the plug on the oil pan.
 
Silly question....can you see the oil level on your dip stick?

Sometimes you need to push the tube with some level of force to get it into the oil pan. It's also possible you've pushed it too hard and it's resting perfectly flat on the bottom of the pan, blocking suction. Try pushing/pulling while the pump is running.

There should be no reason you cannot extract oil from the dipstick tube assuming there is oil in the pan...keep trying!
 
Yup - it should just work. The only issue would be with the pumps - either defective or user error - or the oil is so cold that it's too thick for the particular pump. It's best to just use the dipstick tube and not a little plastic tube that gets inserted - in case that's what you were doing. The Merc hand pump should simply screw onto the dipstick. Some 12V pumps are pretty much a joke.

No remote drain in that year - unless someone added it.
 
Not a silly question, I would have asked the same thing. But yes I can read the oil on the dipstick. The dipstick is a little loose but I figure that the dipstick tube goes into the pan or block then should go all the way to the bottom of the pan along with the stick.
 
I will give it a go again. The pump I have has a tube that tightly fits over the dipstick tube. I ran the pump for about a minute and didn't get anything. I have a copper tube that came with the pump which I assume it should go down the dipstick tube into the pan but I can't get it passed several of the bends.
 
"The pump I have has a tube that tightly fits over the dipstick tube"

Semantics, but just be clear, you're referring to a "hose" that goes over the metal tube? That's fine to use. Put a hose clamp on it - it may not be fitting tight enough. That's the way I do it and it works well.
 
Forget the tube style, get the pump that has a garden hose attachment. screws on with a gasket exactly like the garden hose.
 
Silly question 2: you ran the engine to heat the oil to operating temperature?
 
Buy a $29 Shop vac at Wally world and stick the end of the hose over the dipstick tube, wrap some duct tape around the junction to seal the two surfaces together, and have a quick success story. Store the vac in a Hefty bag, and use it only for oil, brake fluid, and gooey substances.
 
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