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    Easiest engine drop in replacement for 1986 MCM 470

    Thank you
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    Easiest engine drop in replacement for 1986 MCM 470

    I have one more question just to make sure, would the wiring harness be the same for both engines aswell? Would it just plug right into the 4.3? Thank you
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    Easiest engine drop in replacement for 1986 MCM 470

    Sweet thank you for confirming
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    Easiest engine drop in replacement for 1986 MCM 470

    Awesome great to know thank you
  5. C

    Easiest engine drop in replacement for 1986 MCM 470

    Nice yeah it’s 1986 so I have the non MC version, it’s nice to hear that it will fit the current transom. I will make sure to find a Y pipe thank you
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    Easiest engine drop in replacement for 1986 MCM 470

    Will do thank you
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    Easiest engine drop in replacement for 1986 MCM 470

    That’s a great idea thank you I didn’t think of that. I was wondering though, why would the alpha one gen 1 outdrive/bellhousing not work with the 4.3l engine? I looked online and they seem to use the same gear ratio so I was hoping I might be able to reuse the bellhousing and outdrive from my...
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    Easiest engine drop in replacement for 1986 MCM 470

    Very helpful thank you I figured the 4.3 would be a good fit
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    Easiest engine drop in replacement for 1986 MCM 470

    Hello everyone, does anyone have any suggestions on what motor to get to replace current Mercruiser 470 (has valve issues that I do not want to deal with). I just wanted to see if anyone might have a good suggestion to make the swap as simple as possible, preferably an engine that still uses the...
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Gotcha thanks
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    The aluminum seems pretty clean to me what makes you think it might be corroded?
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Yes it is upgraded to the alternator set up
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I only soaked the parts in carb cleaner for a day and then boiled them in vinegar and water, what might you suggest to clean the passageways?
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I bought a kit from mikes carburetor parts and followed his videos. The carb worked better but it still took a few seconds of cranking to start and I still had the carb backfire issue. With the new one it starts instantly but I still have this carb backfire and apparently a leak.
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    Rebuilding OEM carb didn’t work so I suppose I’ll try to find a new OEM one to purchase
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I have tried rebuilding the original and it didn’t work I think the 37 year old carb is just too worn.
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    After bathing the intake manifold and carb in carb cleaner I found a vacuum leak where the throttle valve is controlled by the throttle linkage (pictures below, I have red straw pointing to where leak is) Any ideas on how I might seal this considering the rod needs to be able to rotate around...
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I was trying to check for a blown power valve since I’ve had so many carb backfires. I wanted to see if maybe the diaphragm ruptured and it was leaking while I had the carb open
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I hooked a vacuum pump up to my power valve to check for leaking and it seems to hold about 20 max and then quickly starts leaking. At 7” Hg it leaks very slowly and stops leaking at 3.6” Hg. If anyone knows if this is normal it would be much appreciated thank you. I also noticed that the...
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    1986 Mercruiser 470/170hp/3.7L Carb backfire, low vacuum, other weird issues

    I have tried to rebuild the old one and it didn’t seem to work. Soaked every tiny peace in a pail of cleaner overnight and replaced everything with a kit.
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