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Thread: Opti rebuild

  1. #1

    Opti rebuild

    I am rebuilding a 3.0 L Optimax and before it get i tall back together I have a question about extra oil for first couple hours..??? I read in the shop manual about the ECU adds extra oil for the first couple hours and then goes back to normal. This engine has hours on it and I do not understand how to set the ecu to add the extra oil for break in as it has all new pistons and one new sleeve now. Tony Brucato said he does not do OPTI ecu's... how are local shops doing it? Thanks for info and any helpful input.
    20ft Gambler with Merc 260
    Too many projects to liist..

  2. #2
    Join Date
    Oct 2005
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    Long Island / South Shore
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    455
    They do it with a CDs on a laptop or if it's older a mercury DDT

    96 xpr 787(sea dont)
    03 j17 skiff 40hp
    79 action 17 2?? bmax (all most done spring 11 maybe)
    79 15 viper (sold)
    85 22 velocity 225efi
    82 31 sea ray

  3. #3
    It's a 2005 200hp 3.0L
    20ft Gambler with Merc 260
    Too many projects to liist..

  4. #4
    I can take it to a local shop and get it done before I crank it up. He has the software for it.
    20ft Gambler with Merc 260
    Too many projects to liist..

  5. #5
    Hey bob couple ways you reset optimax computer for breakin. Mercury ddt or turn ignition key don't start and move gear selector between neutral n forward three times. Must be done quick. You should hear the oil pump pumping. When I did my 2003 optimax rebuild and started up on engine stand i jumped the neutral safety switch breaking circuit three times to reset ecm breakin. Again you should hear oil pump pumping if next to powerhead.


    Hope this helps

  6. #6
    Iirc it will only run 5 hours instead of the factory 20?
    '06 Tracker All-Fish/Tournament V-18 90 Optimax, 46.8 gps Goal one complete reach 45 mph.

  7. #7
    Thanks, 2jz I can d that myself and I will runit for the first few hours myself too instead of turning it back over to the owner to do all the break in.. I will go to the lake with it myself an go real easy on it. Seems like they should give it more break in time on extra oil than 2 hours or that is what I got out of reading my shop manual.
    I am a 2.5L man myself.. I like the old school stuff. Before gas got too high priced I liked the 2.4 modified and 2.0 mods. They would scream all day but they do like fuel and oil.
    20ft Gambler with Merc 260
    Too many projects to liist..

  8. #8
    Join Date
    Jun 2006
    Location
    Silverton section of Toms River, NJ/Stuart, Florida
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    My 3.0 was in break in mode for 120 minutes when mercury reflashed it but the has to be a certain amount of load on it to clock off the minutes. It will also reduce it power out put to about 75% at wot. Jmo

  9. #9
    Well this one will not see any WOT for more than 2 hours of running.. The manual says 120 minutes or 2 hours of added oil.. IMO they run them on too little oil anyway. Seems like they would have a special oil with an additive in it to break friction. I have seen something a few years back that was designed for stand by generators which were 4 stroke diesels which start at full rpms when they start up.. They also use an electric oil pump that builds oil pressure about a minute before it cranks up. They call that a pre-lube oil system. But the OPTI's run at about 400:1 @ idling and 60:1 @ WOT is not a lot of oil.. I suppose that's why they only turn them 5600 rpm. The life of an engine is based on keeping the oil going to it. It gets just enough oil to survive..
    Last edited by bobthebuilder; 02-20-2014 at 07:04 AM.
    20ft Gambler with Merc 260
    Too many projects to liist..

  10. #10
    IMO the optimax has only oil on the rotating assembly so not much oil is required. Now your non optimax 2.4 2.5 have to run much more oil because you have oil and gas mix on the rotating assembly. As far as it only turn 5600 rpm is mercury way of detuning performance. Example 250 optimax is not far off in performance to a 250 pro xs and 250xs. IMO rpm and reeds set performance between them. Oiling system is all the same.

  11. #11
    Join Date
    Jun 2007
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    Singapore/Melbourne
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    Doent a 200xs do 8krpm?

  12. #12
    I am still a 2.5 man myself. I am just rebuilding this OPTI for a customer and friend.. Actually it is almost amazing that a 2 stroke even holds together at all. Got to be some very good oil.
    20ft Gambler with Merc 260
    Too many projects to liist..

  13. #13
    The opti still operates like a normal 2 stroke with intake ports. Oil will still flow to the cylinder. The dfi just adds enough air to mist the fuel. Port timing is different on pro pxs ect. Along with computer stuff like ignition timing fuel mapping. You can run the extra oil repeatedly though till your comfy it's broke in.

  14. #14
    Join Date
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    Silverton section of Toms River, NJ/Stuart, Florida
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    Yeah you could always premix 50-1 for a tank

  15. #15
    Join Date
    Jun 2007
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    Singapore/Melbourne
    Posts
    1,845
    I dont think oil in the fuel is going to do much except oil the exhaust port

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