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  1. M

    '79 470 IO, looking for fuse block amperage on hydraulic trim motor solenoid

    I see there is a fuse block on the solenoid for the hydraulic trim motor/pump for the stern drive. can't find any markings on it, would like to know the amp rating. might upgrade it to something new. or at least get some sort of spare. thanks
  2. M

    new gimbal bearing, bearing is crooked in aluminum carrier

    just received my new perma-lubed gimbal bearing for my mc-1/pre-alpha 1979 outdrive that my 470 bolts up to. the engine was out of the boat, but has been re-installed. i already had a new gimbal bearing installed, aligned the engine up to it, but had to make a big adjustment to the engine to...
  3. M

    '79 merc 470 front motor mount, this doesn't look right....

    This is a set of pictures of the upper end of the front motor mount. They show: the adjusting bolt adjusting bolt with sleeve adjusting bolt with sleeve and fiber washer steel washer on top of it all the spacer is holding the steel washer up off of the fiber washer and that doesn't...
  4. M

    '79 - '80 merc 470 exhaust elbow o-ring at the transom, looking for part number....

    i'm replacing the exhaust elbow on my '79 merc 470 (serial number comes up '80, but boat hin is '79). i found that there's an o-ring that seals the elbow to the transom plate. i can't find it in a parts diagram. must be looking in the wrong spot. if you know the part number, or better yet...
  5. M

    merc 470 flywheel/coupler nuts and washers, what grade and type are they?

    i know they're 7/16" fine thread. i'm going with grade 8. the engine project got moved from one garage to another and the nuts and washers (among other things) are lost. are they plain nuts or self lockers? plain washers or lockers, or both? at a minimum i'm going with grade 8 plain nuts...
  6. M

    merc 470 oil pan flange, is it supposed to be flat?

    Looking for some help from someone that has experience with these engines. I took my leaky oil pan off and have found the flange to be dimpled up towards the engine block at each bolt hole. Like would happen if you installed a really hard gasket and really torqued the bolts down tight. Or up...
  7. M

    Permatex Right Stuff gasket maker to replace valve cover and oil pan gaskets? merc 4

    Anyone used, or using Permatex The Right Stuff to replace some of the gaskets on your engine?
  8. M

    merc 470 out of boat for 2 years, removed rocker cover, rusty rocker arms....

    the engine has been out of the boat for a couple years. it's been in a garage with the oil pan off and a few cloth painter's cloths covering it. i'm going to replace all hoses and gaskets. took the valve cover off and found some rust (old and wet with oil) on some of the rocker arms. i want...
  9. M

    1980 Merc 470 Water Shutter part number....

    trying to find the correct water shutter, anyone have a suggested part number from Sierra, Mercruiser, or ?? Mine is totally missing, nothing there. Thanks.
  10. M

    Merc 470, Speedi Sleeves and Loctite Retaining Compound

    Merc 470, I'm redoing the camshaft seals and oil pan gasket, and hoses, and.... Anyway, I'd like to install Speedi Sleeves on the camshaft as it's slightly grooved. The only sleeves close are min shaft dia 0.873", I "dial indicated" the shaft to be between 0.870" and 0.871" as good as my dial...
  11. M

    MC-1 outdrive leaking water into bilge, can't figure out where it's coming from....

    I replaced the bellows, and now I have a leak. I've pulled the engine (470) in order to do some other work. I trailered the boat into the water to see if I could figure out where the water is coming from. It's puddling in the bottom of the outdrive in the area where the hydraulic lines for...
  12. M

    Merc 470 pulling engine to replace oil pan gasket, scrub bilge, anything else to do?

    I'll be pulling the engine in the next couple weeks to replace the oil pan gasket and scrub the bilge. Probably install another in hull transducer since I'll have the access to it. And a bilge pump sensor/switch. Anything else to do in that area? Might pull the fuel tank too, need to scrub...
  13. M

    Oil in the bilge, bad oil pan gasket?

    1980 Merc 470, I've got an oily bilge. I found a bad valve cover gasket and replaced that. Now I'm looking around with a mirror and find most of the oil pan bolts have a drop of oil hanging from it. Is if worth pulling the engine to replace the pan gasket? Monte
  14. M

    So I tried to replace the bellows on my MC-1, and failed....

    put the boat in the water today and there's a leak. Small.... but still a leak. I think it's in the exhaust bellows because 1. it was the hardest to do, 2. after taking the outdrive off the u-joint bellows didn't seem to have any water in it 3. after taking the outdrive off the exhaust bellows...
  15. M

    MC-1 outdrive, only goes up with UP and UP/OUT buttons, how to troubleshoot....

    So my outdrive will only raise with both the UP and the UP/OUT buttons depressed. I don't have the small range of motion I'm supposed to have for just trimming the outdrive "out". I can use the 2 buttons to make it work, but if it's broke I'd like to fix it. Any helpful directions on how to...
  16. M

    Merc 470 Pre-Alpha Outdrive Power Trim, why 3 control buttons?

    I have this in an '80 Glas Ply. I don't understand why there are 3 buttons for the power trim. I only move the outdrive up and down for trailering and motoring. I use the trim tabs for triming the boat while away. So, why are there 3 buttons? They're labeled O UP O UP/OUT O IN UP and...
  17. M

    What SS prop for my Merc 470?

    I'd like to get an SS prop for my Glas Ply. My main trip will be 30 miles or so, Bellingham to Friday Harbor. The boat is trailered, and has bottom paint that I want to remove since it's trailered. 1) Performance issue you are trying to correct. Better cruise speed (currently 22-23mph gps'd...
  18. M

    Merc 470 Pre-Alpha OD, oil in upper u-joint bellows, not supposed to be there is it?

    470 Pre-Alpha OD, oil in upper (u-joint) bellows, not supposed to be there is it? I'm guessing it's coming from the upper drive, that's the only place I know of with oil that high. Only when the drive is tipped up? Pulled the drive off to replace the water impeller. Monte
  19. M

    automotive coil on '80 merc 470 good enough?

    is an automotive coil on '80 merc 470 good enough? trying to troubleshoot a problem of the engine dying after 1/2 hour or so. can't get to the rest of the ignition parts until Saturday, maybe, but I can get the coil tonight and give it a go tomorrow night after work. more on the problem here...
  20. M

    Am I getting vapor lock?

    I'm on kicker heading back to the marina again. It runs for about a half hour then stalls and won't start. It's running on old fuel, but I would think if that's the problem I wouldn't make it out of the marina. I've done this three times now. I replaced all filters thinking that was the...
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