1999 Merc 200 - Oil Pump Went Out?

Hoss 350

Seaman Apprentice
Joined
Jul 29, 2007
Messages
49
I was up in Hell's Canyon last week and ran into issues about 5 miles from the dock on the way back (thank goodness).

The engine stopped running really quite abruptly, like it seized up. I used the kicker to eddy out of the current and then inspected my setup. The oil reservoirs were both 3/4 full. The smaller reservoir mounted on the engine, under the cowling, was dry as a bone.

I had to get out of the canyon, so I transferred oil from the reservoirs into the smaller reservoir on the engine and started it up. It ran for 15 seconds and stopped again. There was oil in it this time.

It will still turn over and start, so it didn't seize, thank goodness. However, i am perplexed by what happened. Why would the smaller reservoir have gone dry when there was still oil in the big resevoirs (they were sealed tight with no kinks or cuts in hoses, BTW)? Why would the engine still stop even with oil in the small reservoir?

Obviously, my engine is in line for a round of compression checks, but I still don't understand what caused this to happen.

Boat in question is a 1999 Hewescraft sport jet, so this engine isn't mounted in an outboard configuration, if that means anything - it is inboard.
 

Hoss 350

Seaman Apprentice
Joined
Jul 29, 2007
Messages
49
Re: 1999 Merc 200 - Oil Pump Went Out?

Oh, yeah, after the second try, I used the kicker to get back out the rest of the way, which was very interesting - ever tried to run whitewater with a kicker motor?
 

CharlieB

Vice Admiral
Joined
Apr 10, 2007
Messages
5,617
Re: 1999 Merc 200 - Oil Pump Went Out?

First thing, go here, find and download the Service Manual for your motor, remember the password 'ribforum' you will need it to open the compressed files

http://forums.iboats.com/showthread...anuals-on-pdf-format!!!&p=2072211#post2072211

Study the oiling system, you will find the large tank(s) are slightly pressurized by crankcase pressure to transfer oil to the motor tank.

The manual will instruct you on testing the system to determine your failure.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,931
Re: 1999 Merc 200 - Oil Pump Went Out?

The 1999 should be a 3.0 liter Optimax motor and it has a electric oil pump. You should have had oil warnings and engine should have went into Guardian mode and reduced power but not quit. I would test compression first and alarm/horn second to see if functioning. Do not try to run it untill you reprime it...
 
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