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    cracks in gel coat

    I have an 1978 galaxy tri hull that has many spider web cracks in top side surfaces some of these maybe opened up an 16th of an inch. I have polished alot of the lower parts of the boat but need an way to deal with these cracks. thinking of sanding down flat. Then filling voids with resin then...
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    help with 1973 mercruiser 165 out drive

    I am trying to help an friend with an older outdrive the trim limits are bad but not located on pivoits which is what I am used to........can some one help me on the these older models. also if someone could help with an source for this part...show to be part # 56046a1
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    120 Mercruisier with model 1 outdrive I think.....its an 1978 model

    I was riding around sunday and hit bottom in the preocess I picked up an piece of nylon rope around prop and it must have had an metal hook or such on it....it broke an piece out of the gear housing above prop just below the cavation plate. how critical area is this . I ran it 3 miles back in...
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    Rebuilt engine break-in

    Just Rebuilt engine in our boat...what would be ya'lls suggestions for breakin procedures. :rolleyes:
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    80 mercury..carb mixture screws

    The mixture screws on both carbs will vibrate and turn on this engine....the springs seem to be ok I even tried to stretch them a little but still screws turn..can actually watch them ...would a drop of blue....ie removeable locktite be ok for these or would this not work. Has anyone else had...
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    Mercruiser 120 help

    I have a Mercruiser 120 on a Trihull Galaxy...while out skiing with son it seemed to tighten up.... oil pressure was good...45 psi .....never dropped...There was a definite knock in either drive or engine...also seemed as though engine was missing.....when getting home the compression was #1-...
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    prop id

    I bought a prop that is suppose to fit my mercruiser number on the prop is 391536 the shaft size is right but hub is too long it seems. what does this prop fit ... do I just have wrong thrust washer or did ebay bite me.......
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    another prop question

    I have a 16'5" Galaxie tri-hull that has a 120 Mercrusier...has really surprized me.......it gets skier up with no problem .....will hit 40 mph on smooth water.....uses less than half the fuel used with my 80 hp merc skiing.....Now for my question I have a 19" prop.....it will redline it with 3...
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    Prop interchange

    would anyone explain what the difference is between the early model Mercruiser drives and the later Alpha 1's......I am looking for a spare prop...see lots for 83 up alpha 1's was wondering what it would take to run prop on early model ie. 1977 120 mercruiser with 1A outdrive I think.....thanks...
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    Mercruiser Outdrive

    I have a Mercruiser outdrive on my 1977 Galaxie Boat. The wires to the two trim switches on pivot of gimbal have cracked and need replacement. They seem to go though transom plate behind gimbal.....how do I change these...... any tricks to make it easier to snake wires thru transom.
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    What PM for outdrive

    Hey guys I have aquired a 17' Galaxie with a 120 Mercrusier. I have gotten engine purring like a kitten and ready for some serious fun this summer what should I do as PM for outdrive. Is there a simple way to test driveline...I see several alimites on gimbal housing...just shoot them with...
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    cracked manifold......120 Mercrusier

    Just found a freeze crack on bottom of exhaust manifold...seems to be minor....motor does over heat or such just small leak.....was thinking of either drilling each end and tapping for set screw to stop crack from increasing and sealing with JB Weld...will this work.....if not what of disassy...
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    Drainage for outside of stringers

    I have just finished replacing the stringers in a 1977 Galaxie Tri-hull I/O. I was thinking of drilling a drainage hole thru each stringer near rear of boat to drain any water that accumulates in compartment outside of stringer. These were full of water when I removed floor.....rotted the...
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    Prop ID

    I have a prop off of a Mercruiser One outdrive. The only marking I can find on it is hub near prop nut.... "Michigan SMC 378 CUP" can anyone tell me what I have......Its on a 16'6" Tri-hull Galaxie with 120 Mercruiser 1977 vintagenull :cool: :cool:
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    1977 Gaxalie inboard/outboard

    what is the history of this manafactor?......others past troubles? it is a 16.5 ft tri hull has 120 mercruiser power
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    uh oh.......what happened

    I was out skinig in my boat today with an 81 model Mecury 80 hp. we had been skiing for about 20 mins or so at an fairly slow rate..... guess 22 -25 mph... engine started to make an metalic hammering sound.....loud enough to be heard over engine...immediately shut down engine and looked at...
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    Online access to manuals.....

    few days back saw a comment on here where someone gave an link to site where manuals could be viewed online......did anyone check this out sounds too good to be true......
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    prop tricks

    have heard that if I drill small holes thru prop hub to allow exhaust to get to prop blades that it will allow better holeshot... without giving up anything on topend.....is this true....how big of holes... where at on prop hub ie. how far from leading edge of blade...thanks guys.
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    using an omc tach on mercury?

    got an excellent buy on an omc tach at garage sale.... but how can I hook it up to my mercury.......which wires to what?......have 80's merc 80hp..... 4 cyl....... tach supposed to have come off 86 omc V-4
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    81 model mercury 80 hp 4 cyl

    Can anyone give me some help... my motor runs great at anything but an idle. motor either loads up and dies after a few secs or dies as soon as you ease it in gear. if I ues fast idle to clear it out then imediately put it in gear it runs fine. if I get it just above idle I have little...
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