To change the oil on most boats you pump it out the dipstick tube. Usually
the dipstick tube is a special one that goes all the way to the bottom of
the pan and has a screw connector on the top. Not so sure about jet boats
though. I've also seen a pump kit that has a tube you put down the dipstick
tube. I've also seen short hoses attached to the pan drain plug with a cap
on them. You push the hose out the drain hole in the transom and then take
the cap off.

I don't see how you could drain the oil via the pressure galley. I suppose
it is possible but you would be trying to draw the oil past the pump. I
definately would not run the engine and let it "pump" the oil out. But I
can not think of what the T could be for. An external oiler maybe. I'm
guessing it's pretty old if it has an olds 455 so no telling what has been
on it in the past.

Why don't you ask the prior owner how he changed the oil?

wrote in message
ups.com...
I just purchased a jet boat and have a question about a hose coming
from the oil sending unit. The engine is a 455 olds converted by
Berkeley for use on their jet drive. Anyways, there is a "t" coming
off the block at the oil sending unit. On one end is the oil sending
unit. Coming off this "t" is a short 1' hose. On the end of the hose is
a fitting that has a short coupling that looks like you would fit a
piece of hose over. If I take off this coupling fitting what is left
at this end of the hose is a spring with a check ball in it.

I'm going to assume that this hose may be used for draining the engine
oil. I checked under the boat and I don't see any eazy-drain coming
from the oil pan (in fact I can't even find the drain plug on the pan
so if anyone knows what side the plug is on...)

Anyone have any idea how this hose would be used? I'm guessing that
when the engine is started the oil would flow into this tube and force
the ball to seal the end preventing the oil from squirting out, but how
would you use this to change the oil?

Thanks