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  1. 3

    Merc 5.7 Bearing Replacement

    Not sure if this has been asked before or not, but is it possible to replace both the crank and rod bearings in a 1998 Merc 5.7 by removing the oil pan, and then replacing them all, one at a time? The oil pan has never been off, so I would simply put a fresh set of stock bearings in. I had to...
  2. 3

    Sierra Continuity Kit

    Anyone know if there is a Sierra part number, for a Mercruiser continuity circuit kit 99940A2 ? Thanks!
  3. 3

    Mercruiser Engine Water Pump

    This past summer, I had to replace the engine water circulating pump [Merc part # 850399 1] on one of the two new Merc Bravo 357 engines I bought in the fall of 2009. It sounded like the engine had thrown a rod or something when it happened out on the water. Luckily the boat has two engines, so...
  4. 3

    Cylinder Head Torque

    I am in the process of trying to torque down all the cylinder head bolts, on a 98 Vortec 4.3 Chevy/Merc engine. The manual [#25] says to tighten all the bolts to 22 ft pounds, and then turn them an additional amount. [short bolts 55 degrees, medium ones 65 degrees, and the long ones 75 degrees]...
  5. 3

    Merc 4.3 No Spark

    I have just reassembled a 1990 Merc 4.3 V6 with a thunderbolt 4 ignition system, after an issue with a cracked block. I have the engine sitting on a skid, and am trying to fire it up, but she won't start. My battery and starter are just fine as the engine turns over as it should. I have put a...
  6. 3

    Merc 4.3 V6 / Balanced Shaft?

    Could someone please tell me how to determine if a 4.3 V6 engine has a balanced shaft or not? I am converting a 1991 chevy truck engine for marine use, [1990 Merc engine with a cracked block] and want to change the head gaskets to stainless. [As well as all the other required parts including an...
  7. 3

    Idiots with JB Weld

    Just removed the intake manifold on a friends 1990 Merc 4.3 V6 after finding water in the oil, and here is what I found. Some idiot [likely the previous owner] actually thought he could repair his cracked block with JB Weld.... :eek: Time for a new block.
  8. 3

    Lost Power And Won't Start

    I was out in a friends boat last night [1991 5.7 Mercruiser with an Alpha drive] and the engine suddenly quit. We were up on plane at about 3500 RPM, and had been for 10 minutes or so, and it just died suddenly. No prior warning at all. Other items on the boat such as the stereo, bulge pump...
  9. 3

    OMC / Mercruiser Transom Cutout

    I am wondering if the transom cutout is the same for a 1989 OMC 5.7 260 Cobra, vs a 1994 Mercruiser 5.7 with an Alpha drive? Thanks
  10. 3

    1992 OMC Ford 302 Cracked Block

    A friend of mine did not winterize his boat properly, and now has a cracked block with water running out of the block itself, and water now in the oil. His block is obviously toast. The Cobra drive is fine. With OMC being long gone, what are the options available for replacing the motor? Will...
  11. 3

    Possible Trim Or Battery Issue?

    1995 Bravo 2 drives. Here is the issue: I have 3 batteries, house, 1 and 2. All are charged and have tight connections. With both battery switches in the off position, my starboard trim operates just fine, both up and down. My port trim however does not. All I hear is a clicking sound when...
  12. 3

    VHF Antenna Replacement

    I have discovered I need to replace a 15 year old broken VHF radio antenna. The current one I have is a 8' Shakespeare 5206-N. Should I just replace it with the same one, or are there better ones now available? Thanks
  13. 3

    Mercury Warranty Promotion / USA Only!?!?

    As some of you may recall, I repowered our 31' Chaparral with two new Mercruiser Mag 357 engines. http://www.mercurymarine.com/repower/mercruiser/remanufactured-mercruiser-products/plus-series/357-mag-bravo-4v/ My 1 year factory warranty is nearly up, and I recently looked into buying a 2...
  14. 3

    Drive Gear Ratio

    I'm trying to find out the gear ratio on a 2000 Volvo Penta SX drive. It came from a Larson Cabrio 254 with a 5.7 in it. The drive itself is locked up solid, and the tag with the serial # is no longer legible at all. Any ideas how to find out? I am thinking it is 1.5 to 1, but not sure. Thanks
  15. 3

    Water Level Petition

    If any of you are boating on Lake Simcoe, Lake Couchiching, or the surrounding area and would like to see the water levels remain higher till later in the season, please visit the link below and sign the online petition. Thanks. http://www.petitiononline.com/drainage/
  16. 3

    HELP! Insurance Problem

    Last week while vacationing on Lake Vernon in Huntsville Ont, we had an unfortunate accident with our 20' Mariah. With 4 people in the boat, and a water skier in tow at about 20 MPH, we hit something in the water below the surface. We heard and felt a big thud under the boat. The engine kept...
  17. 3

    How Fast is Too Fast? / VERY Lucky!

    Perhaps there should be a speed limit on the water? These two people [father and son] are lucky to be alive! http://news.sympatico.ctv.ca/home/quick_work_by_doctors_saves_boat_crash_victim/48fa7606
  18. 3

    Tachometer / Ignition Problem

    The tachometer on my starboard engine is suddenly acting up. All of a sudden it will not go above 3200 RPM, and yet below that RPM it functions as it should. It?s like there is some kind of mechanical problem with it preventing the needle from moving past 3200. I know for fact the engine is...
  19. 3

    More HP / Changing Pitch

    I recently upgraded our new to us twin screw 31' Chaparral, with two 325 HP Merc 5.7s from the original 260 hp engines. http://www.mercurymarine.com/_media/pdfs/productbrochures/899883260_357MagBrvo4V_SS.pdf I only have about 3 hours on the new engines, and have not gone anywhere near WOT yet...
  20. 3

    Boat Explosion

    This may or may not be the right place to post this, but it is an important reminder to all of us who work on our own boats, and even professional boat mechanics. One can NEVER be too careful when working on a boat, ESPECIALLY around the fuel system!:eek...
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