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Old 10-21-2011, 07:59 AM
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Default 2008 Mercury 250 optimax oil prob

I am a new boater and recently purchased a 2000 28 zf Donzi with twin 08 250 Merc optimaxs. I am having a problem with one of the engines not getting oil to the internal oil tank. The previous owner had the same issue and replaced the pump less than a year ago and was just wondering before i spend more money if anyone had a similar problem that was not the pump?
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Old 10-21-2011, 09:48 AM
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As far as I know the pump has nothing to do with oil getting to the tank under the cowling. It is pumped by crankcase pressure. Check the caps/seals on your external tank, there is also a little filter that can clog (I assume) somewhere inside the cowl port side I think. At least on the regular opti's.

Fill the motor tank and disconnect the oil line in front of that filter, start the engine at idle and oil should pump out. If not then check the seals and the line where the pressure comes out on the block. It's on the starboard side of regular opti's.
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Old 10-21-2011, 10:11 AM
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VanW hit it right on the head. I would think the cap on the tank is leaking or the check valve on the engine may be faulty.
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Old 10-21-2011, 10:13 AM
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Quote:
Originally Posted by captbone View Post
VanW hit it right on the head. I would think the cap on the tank is leaking or the check valve on the engine may be faulty.
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Old 10-21-2011, 10:17 AM
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Would like to add one thing. I got mine used and could tell by the color of the oil that it was merc premium plus. Now, I am not knocking the oil but, when I drained the lower tank out there was a 1" thick layer of sludge on the bottom of the tank. Your pick up sits app. 3/8" above the bottom of the tank, so my pickup was in this sludge layer. I didn't have any problems like the OP did, just thought I'd add a little insight.
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Old 10-21-2011, 12:29 PM
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I have an older EFI but do not think the supply system is much different so X3 on the pressure issue. There are two hosses running to the external tank. One comes from the lower end of the motor and presurizes the tank by using crank case pressure to help the oil flow from the tank to the motor reservoir. The other is the return line to the tank. If there is a leak anywhere in the pressure line the oil will not go from the tank to the motor. Cracked lines, loose clamps, cracked filler tube, cracked filler cap, improperly installed filler cap or tank cap etc. should all be checked to make sure they are not leaking. Also, I had the same problem and realized that I crossed the hoses at the tank - so the pressure hose was going into the pick-up line and vise versa. Needless to say it did not work. Finally, you have to get the tank on the motor full - it does not do it by itself. To do this open the cap on the tank on the motor and see if the oil level comes up. When it gets to the top tighten the cap.
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Old 10-21-2011, 12:32 PM
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Check the screen on the oil tank pickup in the boat for sludge/debris, I have seen this many times clog up and cause the engine tank not to get oil. If that is clean, check seals on the tank and make sure oil lines do not have any tears or holes in them.
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Old 10-21-2011, 05:58 PM
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I had one kick my azz ,turned out to be the pressure fitting or crank case fitting that screws into block on #5 cul that provides the crank case pressure to the oil tank
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Old 10-25-2011, 08:32 AM
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Thanks for the info
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Old 10-25-2011, 10:08 AM
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Could be the check valve, but I can count those on one hand, usually it is a clogged screen, filter going to the oil bottle, or hose leaking somewhere (not very often).
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Old 10-26-2011, 07:28 AM
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Got the boat back yesterday it was the in-line filter!
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Old 10-26-2011, 07:42 AM
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I do not have an Opti but have an older EFI with what would appear to be the same tank set up. Just out of curiosity - where is the inline filter??
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