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04-01-2018, 07:27 PM #1Member
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1993 Mercury 2.5 xri 175 hp oil injection system
i just purchased a 1993 Skeeter bass boat with a 2.5 xri 175 hp Merc. it has been sitting up for 2 years and I'll be changing the impeller, fuel/water separating filter, thermostats, rebuild fuel pump, gear oil, etc.before starting the engine. i did not start it when i purchased it but did do a compression check on the cylinders. all 6 were at 120 psi.
i want to dismantle the oil injection system and go premix before firing up the motor. i have read lots of the threads posted here and feel i can remove the system from the motor. However, i am concerned about removing the detonation sensor and module that it is attached to.
if removed, will this effect the timing in some way ?
Also, the threads on this subject call for removing the rotation sensor near the oil injection pump. would it be ok to simply leave the rotation sensor and the detonation sensor in place and just remove the oil injection components?
i have the kit to plug the hole where the pump is and another plug for the starboard side of the engine.
any help will be appreciated.
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04-01-2018, 08:35 PM #2Josh Peterson
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04-01-2018, 08:54 PM #3Member
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that's the thread that shows the removal of the system, which is great and very detailed and simple. my engine is exactly like the one in those photos. i just don't know if removing the detonation components will mess up the timing. I'm needing to know if the detonation module and sensor, and rotation sensor can simply be left in tact. why is there a need to remove them?
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04-02-2018, 07:12 AM #4
The idea is that when any of the timing modules fails it can effect the total advance and if you’re running on the edge for max performance this can cost you a motor. So you pull off all the modules and set your max total timing where you want it and then you can sleep well at night knowing that these black boxes aren’t going to cook your powerhead.
It would probably be a good idea to check the timing after ditching the modules.
Josh Peterson
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04-02-2018, 09:58 AM #5Member
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Thanks for that info. I’m going to be using the boat mostly for fishing. I don’t really have the need to be running high rpms for long durations. In that scenario, could I go ahead and leave the oil pump rotation sensor and the detonation module and sensor in tact after removing the oil injection pump and components ?
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04-02-2018, 10:03 AM #65000 RPM
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Rotation sensor serves no purpose anymore once you put in the plug. It senses through the aluminum block and doesn't seal anything so it can be removed to reduce clutter and weight on the engine or it can be left on the engine.
never had the knock sensor so can't help you there.
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04-02-2018, 10:13 AM #7Member
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Thank you for the info !
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04-02-2018, 10:19 AM #8
If you ditch the oil injection you need to ditch the rotation sensor. Otherwise it will alarm as the pump won’t be turning anymore.
From my understanding of the detonation module function it advances the base timing 6 degrees once past 2500-3500 rpms. This it the range it can then retard timing if it senses detonation.
The idle stabilizer also advances the base timing, then pulls some out once you pass a certain rpm.
As these modules are capable of advancing the base timing they are usually ditched in a hipo application to prevent them from advancing the timing at the wrong time and cooking a motor. Since they both advance the timing, the base timing for a motor equipped with the modules will be less than a motor that’s not. After you yank the modules you should reset your timing to whatever you want it to be (usually around 25*).
https://www.screamandfly.com/showthr...76#post3032476Josh Peterson
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04-02-2018, 10:29 AM #95000 RPM
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He can leave the sensor in and keep it connected to the warning module or disconnect it. It makes no difference. He will have to disconnect the warning module from the alarm horn. If the rotation sensor is missing or not getting the correct rotation pulses timed to the ignition, the warning module will send an a rapid beep oil injection alarm.
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04-02-2018, 05:58 PM #10Member
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thanks for the wiring info and your input.i would like to keep as much in tact as possible regarding the misc. sensors and modules. I'm thinking of leaving the rotation sensor on the motor and just kill the alarm. i would also like to keep the detonation sensor and detonation module intact and letting it work as intended by Mercury to control the timing functions. what do you think about that ? will that work ? thanks !
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04-02-2018, 06:02 PM #11Member
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thanks for the reply! that makes sense. do you know the location of the warning module so i can disconnect it from the alarm horn? i'm guessing its under the dash somewhere?
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04-12-2018, 07:44 PM #12Member
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Big Thanks !
I wanted to thank all of you who replied to my threads about removing the oil injection system from my engine. got it done with everyone's input.
I wanted to share my story of how i discovered Scream and Fly. Before purchasing the Skeeter with the 1993 2.5 175hp mercury, which was the 3rd boat that i was looking at to buy, I ran across a beautiful 1991 19.5ft. Charger VF 195 bass boat with a 2.4 240hp Bridgeport Merc. This boat was a one owner, all original, in pristine condition and always kept inside. This boat was only used for fishing local lakes and not used more than 3-4 times per year. While doing research on the Bridgeport, I found the Scream and Fly Forum. I test drove this boat and now know why the forum is called Scream and Fly. This boat did exactly that. It was extremely fast and extremely load. I wanted this boat real bad but i ended up passing on it. It was really too fast and too loud to be able to take my kids and wife fishing and/or tubing at the lake. I guess i can say that i got to experience screaming and flying once in my life.
Thanks again to all !!
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