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  1. Scott06

    Possible boat purchase!

    VP SX drive and 4.3 is a very, very reliable and good powertrain for that size boat. It is of the age that rubber componets liek the bellows will fail. Exhaust bellows are no issue as they have water in them anyways. If the driveshaft bellows leak you get water in the boat and ruin the ujoints...
  2. Scott06

    Prop Suggestions Needed

    Again dont worry about the diameter. Typically diameter will go up as pitch goes down in the same prop. Your safest bet would be to stay with the same prop just go down one step in pitch. If you can find a local prop shop that will let you try before you buy that is also a good route
  3. Scott06

    Repeated impeller failures, help

    OP stated Bravo 3 drive in first post. B3 is going to use a belt driven pump unless someone has changed it out. To my knowledge Merc never used a crank driven pump like Volvo, but either design works
  4. Scott06

    Engine coupler or dog clutch or something else

    Pull the drive and inspect coupler for rubber pieces and screwed up or pointy splines. Take top off drive look at upper gears see if they are ok. whit smoke could be overheating if coupler is slipping or drive gears are gone vertical shaft in outdrive wont be spinning and thus water pump...
  5. Scott06

    3.0 MPI Failed Fuel Line

    Line was probably chaffing against something or could be a manufacturing defect, but not a common problem. don’t know of a torque spec for the fuel line line connection get it good a snug with a calibrated elbow and check for leaks
  6. Scott06

    1974 mercruiser 3.0 cylinder head interchange

    Pressure test by blocking off the water inlet and outlet. Need to fab a blcok off plate ate outlet to elbow… if they are that rusty and you are spending for a new head might be better off to get new manifold or clean fresh water take off. if you have that much rust inside the manifold and...
  7. Scott06

    Burned valve or worse 1997 5.7 LX

    Yes the knock sensors do work and i think it is basically a gm system or at least the sensor and module are. If you have a timing tape on the balancer you can see the total advance at any rpm. There are probably more elegant ways but i think you can wrap the side of the block with wrench while...
  8. Scott06

    Repeated impeller failures, help

    No impeller but that is where the water is picked up by the sides of the drive , if there is debris the engine mounted water pump wont be able to suck up the water. people bypass any of these issues plus barvoits by using a thru hull mounted water pickup
  9. Scott06

    No start merc 4cyl

    Which merc 4 cylinder you working on? Engine serial number is best. youve confirmed you have a spark with a spark gap tester or holding a spark plug against a ground? Try turning the distributor while cranking ? fuel shooting out of carb do you mean you get two stream out of accelerator pump...
  10. Scott06

    Yellow sticky fluid from engine

    Michigan mortorz in MI and marine power in LA are the two that come up a lot
  11. Scott06

    Drive Housing Pit Filler?

    Ive just used merc phantom black rattle cans. Really depends on what you want it to look like. Im sure a ppg concept single stage would be good for durablity but dont get any runs you cant sand it out easily…high build primer only if you are trying to make it shine. in the old days probably...
  12. Scott06

    Thru hull exhaust

    Marine rating on accessories has nothing to do with being hardened , what ever that meas. marine rating is for components designed to prevent electrical sparks and gas vapors from igniting. This challenge is quite different in an enclosed marine engine compartment vs an engine on a car or truck...
  13. Scott06

    Prop Suggestions Needed

    Ok so based on what you are showing for rpms and stated good running condition drop 2” in pitch
  14. Scott06

    1974 mercruiser 3.0 cylinder head interchange

    Yes you can if you can still use the existing manifold there is an adapter https://www.michiganmotorz.com/mercruiser-exhaust-manifold-adapter-plate-kit-high-output-3-0l-engine
  15. Scott06

    Carb or worse?

    No harm in loosening the valves and trying it, worst case it will clack and make some noise
  16. Scott06

    Prop Suggestions Needed

    Dont sweat the diameter that is for the prop designer to figure out. I belive the rule of thumb is 2" pitch decrease per 3000 ft of elevation increase . Was the boat ok with a 19" at sea level or close to it
  17. Scott06

    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    ok good to know it usually the easy stuff. I had a sticking choke on my mercarb would foul the plugs pretty quick. You can force it open to test but if opening it made it run worse you are probably lean in the carb
  18. Scott06

    Thru hull exhaust

    two 45s on each side with marine hose in between to make them meet up . The post above gave some links or places like michigan motorz will have them. Have you had a boat with thru hull exhaust before? A lot fo folks end up hating it after a while .
  19. Scott06

    Prop Suggestions Needed

    I think you will loose 15-20% power at these higher elevations and your carb will need rejetting if it hasn;t been set up for these elevations. De rated for altitude you probably only are making 160 or so hp on a faily decent sized boat. Try a 15" pitch or if wakeboarding is your thing try a 4...
  20. Scott06

    Yellow sticky fluid from engine

    Yes you have water in the crank case, which fills up until it comes out the valve covers. How was it winterized? Usually this is from improper winterization and you end up with a cracked block typically under the heads in the lifter valley. Also can crack or rot out thermostat housing on...
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