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Author Topic:   Serious questions @ merc 225
DaveW posted 08-11-2002 08:29 PM ET (US)   Profile for DaveW   Send Email to DaveW  
I have a 1996 merc 225 Black Max on my 23 WA and when I tilt the motor up to trailer, half of the oil in my reserve oil tank seems to leak out so that every time I put the boat back in the water, my low oil light comes on and I have to add oil directly to the reserve tank. Dealer says I am out of my mind. Has anyone heard of this? It is not a big problem but it is driving me nuts because that engine hood is Huge and heavy in the 100 degree heat.

Thanks, Dave

David Ratusnik posted 08-11-2002 08:49 PM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
While not your solution, another reason to premix. d
bsmotril posted 08-11-2002 09:47 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
This is a failry common problem in my experience with Mercs. A couple of things can cause it. Check the easy one first, look for a crack around the rim of the cap of the under cowl oil tank. If tightened down too much, it will crack right where the threads end and the flat cap surface begins. The next likely cause is a bad check valve. There is a valve that bleeds air pressure from the remote oil resevoir after the motor is shut down. This is also easy to check. Run your motor, then shut it down. Wait ten minutes, then open your oil fill cap on the remote tank, or remote fill. If you hear a whoosh of escaping air, you have a bad check valve. If the pressure does not bleed off of the system, it will force the oil out of the vent tube of the under cowl tank when the motor is tilted.
DaveW posted 08-14-2002 06:08 PM ET (US)     Profile for DaveW  Send Email to DaveW     
Thanks Bill for your reply (as for David's I gues he does not realize that it is a little tough to premix on 180 gallons of fuel). I will check both of those. I am guessing that it is the check valve given your two options. However, the most suspicious looking fellow is the overfill drain hose in the under cowl tank. It is placed on the front of the tank so that 1/4 of the oil capacity is sitting on top of this drain hole. I don't know if the oil can just gravity drain out or if in fact the check valve is bad and air is forcng it out. Here is another strange thing: It is draining out about 1 qt of oil each time and there is a little oil in the cowling but certainly nothing like that amount (which I would think would be prety evident). Does the overflow drain back into the main oil tank? Thank you again for the help.
lhg posted 08-14-2002 06:13 PM ET (US)     Profile for lhg    
Mercury and Yamaha oil injection systems are pretty much bullet proof, and should never be disconnected because of the OMC fear factor.

The source of the leak should be easy to find and fix.

Swellmonster posted 08-21-2002 12:55 PM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     

What did you find?

DaveW posted 08-22-2002 09:08 PM ET (US)     Profile for DaveW  Send Email to DaveW     
Ghost in the machine! I went out for three days last weekend to start the diagnosis and not once did it exhibit the problem...figures. I think I am going to replace the check valve anyway.

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