School me on MRI dry sump oil system

[betterwhenitswetter]

Ok guys I pulled the oil filter,

first test no spark plugs, only starter so rotated the engine nice and slow to test flow, it would flow a little enough that made sense to me for about 200 rpms.

2nd test, full run>ran the engine for bursts of 1-3 secs max, as it would fill up my container/oil catch bowl quick even with my pneumatic oil sucker was trying to keep up it, flows plenty when the engine is on, I ran it over and over....... and over. The dry oil tank never level never went down, in-fact it got fuller!!!

so bazzar that the dry sump oil tank would never go down, every dang time I have done a oil change the level drops so you add oil. it has to be the dang oil pump.

I am guessing here, the pump has 3 rotors, 1 suction rotors, one pump is a bypass, 2nd suction pulls oil into the dry sump tank, 3rd is pressure for engine which pulls from dry sump tank. <- has to be the 3 rotor in the pump.

but if its the pump bad how did this happen in the first place from a cyl 3 fuel injector that was fubar ?

 

[bronze_10]

Or maybe it was just a faulty pump.... maybe there is a little construction debris from the engine build that was sucked up... I am at a lose here for u... but after all you said and tried I tend to agree... it's got to be the oil pump... how hard is it to change?

 

[Scottintexas]

Hey Scott, I remember you helped me 5 years ago when I got my boat, I remember you came over to my house with your son as well (I believe it was after your son's cub scout meeting ), you pulled the hours since I just bought it used and had no idea..., it showed 24 hours on it.

Hey that was me, I thought your user name was something with "Camaro" in it, that must have been at YJB. I wish I knew you had a ski I would have asked to borrow it one day, my kids have been killing me about riding one!

 

[betterwhenitswetter]

Hey that was me, I thought your user name was something with "Camaro" in it, that must have been at YJB. I wish I knew you had a ski I would have asked to borrow it one day, my kids have been killing me about riding one!

It was on YJB, but I am not on that site anymore... I will never go back.

I didn't have the waverunners when you helped me, I do owe you one!

 

[betterwhenitswetter]

A HUGE THANKS TO BIG SHASTA for allowing me to view the oil pump and dry sump tank service manual.

 

[betterwhenitswetter]

just an update guys, since all the oil was drained even from the engine I tried 2 quarts of fresh oil in the tank only, turned the engine over no plugs... didn't move a single bit. Installed plugs ran it for 2-3 seconds same oil didn't move at all.

The pressure rotor is supposed to pull from the tank... sigh I guess its officially coming off.

 

[bronze_10]

I was going to say... even running it for 2 to 3 seconds and turning it over all this time with no oil getting to the motor isn't healthy at a minimum.. u have to diagnose the issue but I would be worried about doing any more engine to rotations with no oil... may just be time to dive in like u said!

 

[cybuch]

just an update guys, since all the oil was drained even from the engine I tried 2 quarts of fresh oil in the tank only, turned the engine over no plugs... didn't move a single bit. Installed plugs ran it for 2-3 seconds same oil didn't move at all.

The pressure rotor is supposed to pull from the tank... sigh I guess its officially coming off.

What did you end up finding here? I am having a similar issue with the oil pressure light coming on.