I am replacing some parts on my 97 225 EFI, i noticed that the tuner was almost completely stopped up with carbon build up. I have already cleaned it out but am wondering if cutting a small hole in the bottom of the tuner "almost where it meets lower unit" would help with some of the exhaust exiting??
Don
I understand by these post that you should be able to drop the lower unit and look up and inspect for blockage, can you also clean out the ports from below without disassemblying?
Irving-NorCal
2000 Cobra Viper 201 DC
2024 Mercury 250L Pro XS SN# 3B431534
Fury 3 Blade 24P
Read post #9 above. You can see only 6 or 7 of the ports from the bottom side. If they look like they are getting plugged then pull the powerhead, remove the tuner and clean them all. Its really not that bad if you have wrenched on motors any and you say it fast. When I did mine a couple of years back I rented an engine hoist to lift the block. Set it up one afternoon and returned it the next. Hardest part is scraping all the gasket surfaces on the bottom of the engine block.Originally Posted by Irving-NorCal
Butch Derickson
2011 Z521 w/250 hp SHO
Traverse City, Michigan
Don,
If a person were to find their tuner to be as dirty as the one above, is there any harm in taking it to an automotive machine shop and having it cleaned as one would do to a cast iron block prior to rebuilding?
Rusty
MSG (R)
Louisiana National Guard
Desert Storm, OIF Veteran
08 21XDC/300XS
Rusty:
BE CAREFUL HERE... Your tuner is not made of cast-iron!
However... you COULD drill out the openings, and then have the tuner cleaned in the same fashion that would be used for an ALUMINUM block or head casting.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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Drilled mine till the holes cleaned up then pressure washed. Good as new!
Own the Champ!Life Long Petty Fan!
2003 ChampioN 2006 250 Merc. XB, Prop By Mark C.
2002 Ranger Okeechobee Special EvinRude Ficht 90 / 9.9 4-Stroke GLAD to have a Get me to the Dock motor maybe!
this one was mine before and after the treatment
IMG_1034.JPGIMG_1037.JPGIMG_1038.JPG
thanks
F.
Other than a drill... What material do you use to clean the carbon out?
Drill and hot steam (pressure washer).
IMHO... once you've drilled the passages open, clean what you can (reasonably).
Tuner will be black by the end of the next outing (roughly as futile as washing the inside of the tailpipe on your auto).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
I am going to look into the hydro tech tuner
It makes some noise.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Thats perfect for me. Don I'll be sending you my injectors and fuel rail very soon as well.It makes some noise.
The popit diverter a simple install?
What does it look like from the bottom when the lower unit is off? I took my lower off and looked up but didn't see any holes. Just looks like it goes straight up to the powerhead.
You cant see all of them without pulling the powerhead off.
Im having trouble loading the photo I took. I read where I couldn't see all of them from the bottoman but I'm not seeing any at all. I'll keep working on getting a image loaded up.
You cant see them from the bottom of the tuner . You have to remove the exhaust plate assembly .
Last edited by rchavis; 03-23-2017 at 12:50 AM.
Bucketmouth- I think you're looking up through a different tuner than the one being discussed in this thread.
Please open a SEPARATE thread for your engine, and provide the engine serial number in that thread. Thanks!
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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