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    What do the serial numbers mean??

    OK, Mercruiser serial numbers are a bit confusing to me and I'd venture a guess to many others as well. The numbers are good as far as they go. Then we start to add a letter :( to the beginning of the number and that's where the confusion begins for me at least. A number series goes how far...
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    Which material???

    There are so many options for the types and weights of ?glass. You can do it so many ways and probably have good success with it. Very confusing! A search brings up many more hours of useful and confusing/confounding opinions. New deck. ? exterior plywood. Want to glass/poly resin both sides...
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    outdrive holes first or after?

    Am about to replace transom. Is it easier/better to cut the hole for the outdrive (mercruiser) in each layer then laminate? laminate first and then cut? or install solid and cut after installed in the boat? Is one method stronger? I can't see it but am not an engineer.;) I can see benefits...
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    Anyone used PL Urethane for this??

    Have read with much interest the uses for PL Urethane adhesive. I am impressed enough to plan to use it to laminate the 2 3/4" plywood sheets for the transom. Wood to wood I know this stuff STICKS! How does it stick to other material? Fiberglass? Is is a suitable material to fasten a glassed...
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    how much room in outdrive hole???

    About to replace the transom in an I/O (mercruiser R series drive) want to wrap glass and resin around drive cutout in the wood to seal. Wrap from material (glass) from between plywood and outer shell through hole and attach to inner surface of ply. How much room does one have to "play" with...
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    84 Mercruiser 120/2.5L timing/fuel question

    1984 Mercruiser 120/2.5L Getting ready to start first time with a fresh rebuild. Reading all timing specs. The manual has a date of 1986. The fuels available today are not what they were in 1984 or 86. All fuel in N. Texas is heavily ethanoled. What should timing be set to "today" for this...
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    Ready to OIL a fresh 2.5L Mercruiser

    A few weeks ago there was a thread about how to rent a tool from the likes of AutoZone to run the oil pump on a SBC to pre-oil prior to starting the first time. The old trick of simply running the oil pump with a shaft driven from a drill was thrown out because a portion of the distributor hole...
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    Transom cutout is drawn in....

    Not much help in the title. Am replacing the transom on a 1984 Galaxy 17' BR. Got almost all the "stuck on" plywood off of the inside of the transom and will be grinding and making templates soon. In the process of looking and dreaming (err...planning) didn't like the look of the transom cutout...
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    Front motor mount 1984 120/2.5L Mercruiser

    Posted this question on the rebuilding forum and didn't get the ideas I was hoping for. Maybe will get another look at the problem here. In the process of transom replacement. Found the front motor mount screwed in to a few layers of f'glass only. All wood below it is gone. Will have to...
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    Replacing rotted motor mounts

    I need some ideas!! Maybe even a proven method from someone who has had to work through the same issue. In the process of replacing the transom and have found the forward motor mount is screwed to f'glass only as the underlying wood is rotted away. I am most nervous about the front support and...
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    "Composite" Stringers has it been done???

    Here we go, time for some thoughts, advice, and probably some controversy. :D Stringers... There are literally thousands of homebuilt aircraft, one that traveled around the world non-stop and another that made it to outer space that are of COMPOSITE construction. Basically foam core with glass...
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    Partial transom replacement????????

    Ok have a thought and the thought may well be completely wrong. Or I may be as they say all wet....:rolleyes: 1984 17' Galaxy bowrider. Floor was rotted and from all I can tell the stringers are solid. Transom is rotted from one third of the way up the cutout for the outdrive to the bottom. The...
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    Is the "Glass" really the strength???

    Boat is an 84 Galaxy (made in SC) 17' bowrider. Floor was rotted, had been previously replaced and they went to all the trouble of sealing the seams....with duct tape...:( oy. Transom rotted bottom 10 inches only????? All indications this water infiltrated through outdrive transom mount...
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    Main bearing cap bolt attached stud?...

    Replacing a Mercruiser 2.5 120 hp. with a rebuilt OMC 2.5L block. Attaching all the Mercruiser stuff to block. The OMC crank bearing cap uses a bolt with an attached stud (maybe for an oil pump pick up tube support?). Will this affect anything in the Mercruiser version negatively? I can't see...
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    Dipstick tube removal.....how???

    Thanks in advance for the help you've always come through!! 1984 Mercruiser 2.5 120hp, am taking all except short block and head and transferring to a rebuilt engine. Was doing fine until I came to the dipstick tube. Does it pull out, screw out, press fit or glued in? Looked through the manual...
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    What's it weigh??????????

    Can anyone tell me the "all up" weight of a GM 2.5-3.0 Mercruiser with accessories, (manifold, carb, alt, starter, bell housing and front motor mount, etc.). Need to know how far to take the weight training before I pull it out:D! Need to plan the lift and need an idea to arrange for the hoist...
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    engine block casting numbers?

    Is there a difference in the engine block casting numbers for a 2.5 and 3.0 GM 4cyl? (1984) I only have the freshly rebuilt block with head (and new head gasket :redface:) attached (no other accessories or attachments to help determine the engine displacement) and original owner (not...
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    On To The Next Question...

    I predicted I would be back. Here I am! I have a 84 Mercruiser 120 (2.5) serial 6809214 and am going to be replacing it with a reman block and head from a like year OMC. My problem is one source indicated that the carburetor main jets (Mercarb) were different for a 3.0 and a 2.5 engine. I do...
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    2.5/3.0 early late flywheel identification

    Still trying to piece together a "whole motor" have an interest in a rebuilt not yet installed motor. Even used brass core plugs. Still trying to determine if it is a 2.5 or a 3.0 and early or late vintage. Not much to go on as there are NO other parts lying around except an oil pan in OMC blue...
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    Are the GM 4 cyl blocks same OMC and Mercruiser?

    Need to replace Mercruiser 4cyl short block 2.5/153 '84 vintage (freeze damage). Will a OMC 4cyl GM short block interchange. This question seems soooo simple and will probably be the hardest and most detailed discussion I have ever been part of. Thanks for all of your help, again.
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