KAD44 oil change

[simonfraser]

basic, i know, but

recently i used a pump to remove the warm old oil through the dipstick.

can't say i was happy with the speed or the quantity i got out, recon i got about 80% of the total out.
looking at how much went back in again.

there is a drain plug under the oil pan, that's gona get messy, but i'd rather do it properly, worth the hassle ?
what does one use to catch it all, access is very poor.

or is there a third way ?

 

[alt]

The only way in your boat is dip-stick method.

I tried those electric pumps - too slow. I now use the pump-action vacuum pump (non electric) - You're right, they get about 80 - 90% of the oil out. However, I change my oil twice annually (so about every 50 hours) so it's not an issue.

(And yes, the 2 x oil changes annually is OTT, but oil is cheap, so why not)

 

[Assassin]

Yes, there is a way and it involves some work if you don't have a drain plug and the first thing to do is have one installed OR have a drain tube welded to the lowest point of the sump which leads to the side of the engine, normally you can find a sump from an engine used in a different application with a drain plug to fit your engines.

Fit a pipe into the sump plug drain and run to an appropriate accessible point, install an on/off valve in line and then fit a blanking cap or bung to the end of the pipe as an extra safety measure and when you drain your oil you can drain it a little at a time into a container using the valve to control it and you get 100% of the oil out along with any sediment or sludge building up in the bottom of the sump.

 

[Assassin]

Double post.

 

[simonfraser]

The only way in your boat is dip-stick method.

I tried those electric pumps - too slow. I now use the pump-action vacuum pump (non electric) - You're right, they get about 80 - 90% of the oil out. However, I change my oil twice annually (so about every 50 hours) so it's not an issue.

(And yes, the 2 x oil changes annually is OTT, but oil is cheap, so why not)

tnx, which manual pump do you use ?

 

[Sailorsam101]

How hot were the engines when you drained them as this makes a big difference.

First time i changed oil..AD41P-A...i ran the engines for about 25 mins each and got about 80% out like you...not good i thought.

So the next year i went for an hours blast at 20kts and got about 95% out. It made me understand just how long it takes for engine oil to heat up in big engines.

 

[NBs]

With my experience for several years, the KAD44 C engine oil suction of about 7-8 liters gets out of the machine and the engine always has 3-4 liters of dirty oil which is naturally not a good thing. I made the oil shunt machine's normal heat of about 85C and a good quality vacuum pump. On the other hand, I know KAD44 has reached +5000 hours without being rebuilt.

NBs

 

[simonfraser]

How hot were the engines when you drained them as this makes a big difference.

First time i changed oil..AD41P-A...i ran the engines for about 25 mins each and got about 80% out like you...not good i thought.

So the next year i went for an hours blast at 20kts and got about 95% out. It made me understand just how long it takes for engine oil to heat up in big engines.

good point, did the change after running it on the trailer, on land etc.

shall do the next one on the water now i am confident how to proceed.