Anyone know what the thread size is on the plug that comes out of the tether on the oil drain hose... Not the bolt that goes into the oil pan... the plug that screws into the tether on the side you drain from....


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Ayuh,.... I believe it's 1/4" pipe,.... maybe 3/8" pipe,....

thanks

I think 3/8. Takes a good couple hours for all the oil to drain but its great. Enjoy the lake all day. Put boat on trailer. Pull hose and remove plug. Sit on deck and drink beer. Fill it back up in the morning and your back on the lake.

Put a pair of hoses on my 525s last year...they're 1/4 NPT

That's what I thought.. looked a little small for 3/8 NPT. Gonna hook it up to my oil drain pump.. thanks everyone!!!

You definetly have to pump the oil out you'd be old and grey if you wait for gravity to do it for you. I use a 1/4 NPT to hose adapter and hook to vacuum pump.

On my 38, the hoses were removed so I was pumping the oil out of the dipstick but never quite got it all out. My new boat has the hoses, so I'm going to do exactly as you said and hook up my pump to the drain hose. Thanks!!

They do take a while to drain especially if they oil is cold. However, changing cold oil isn't ideal as any unfiltered particles have settles on surfaces and may not come out with the oil. It's best to drain warm oil as 1) it's faster, and 2) any particles are suspended since the system has been flowing.

I pull the drains when I get home from a weekend of boating, and let them drain overnight into a 5-gallon jug. I drain my filters into the pan as well, and let the whole thing drip out for at least 24 hours, Then come back on a weeknight and fill them back up.

I never drain the oil when it's cold. I usually run the engines for about 10-15 minutes and get them nice and warm. Then I punch a few holes in the top of the oil filter to break the vacuum and let the oil drain down.. Then I hook up my oil changer pump to the dipstick and it pumps out the oil in about 2-3 minutes. But it never quite gets it all out as I usually can only add 6 1/2 - 7 quarts of oil back. If I hook up the pump to the drain hose, I should be able to get most of it out.