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  1. Scott06

    Water in cylinder, oil and carburetor

    A bad head gasket or leak between manifold and elbow/riser could cause water in a cylinder, as could a cracked head. But I doubt at 115 psi you had a leaking head gasket and its obvious the manifold was full of water by the carb. So doubt there was any issue with the head gasket or elbow to...
  2. Scott06

    Water in cylinder, oil and carburetor

    gotcha. never seen that but makes sense not like the stud is water tight. Other thing is condensation under the covers, the one year I had to leave my boat outside I out a plastic trap over the snap on cover , holy chit in the spring ...
  3. Scott06

    Water in cylinder, oil and carburetor

    Not the flame arrestor, the flame arrestor cover. It is a plastic cover that goes on top of FA that is bigger than it keeps water from dripping on it. On the V6/V8 engines it also covers the distributor, which on my boat is right under the seam between the hull and the sunpad so gets wet when we...
  4. Scott06

    Water in cylinder, oil and carburetor

    Looks like you got water in the carb and down in the manifold. Was flame arrestor cover on it? This is one of the reasons the cover is for. do the valves close fully on those cylinders or have rust on them. May want to take head apart and consider valve job. In hindsight Would have been good to...
  5. Scott06

    2005 Mercruiser MPI 5.0L misfiring(?) when in gear, idles fine

    I think it is a standard GM cap used on their trucks I dont think the cap is marine rated , just the dizzy
  6. Scott06

    Transom leak. 4.3l mercruiser with alpha one gen2

    only if you say " hey guys watch this" before putting it into gear...
  7. Scott06

    2005 Mercruiser MPI 5.0L misfiring(?) when in gear, idles fine

    I missed the dizzy cap in first post. You are right in your research that the 3 wires sensor on TB ignitions is better, just your MPI engine uses a different system. Hopefully AD can come up with some ideas for you
  8. Scott06

    2005 Mercruiser MPI 5.0L misfiring(?) when in gear, idles fine

    Mpi uses a different distributor and ignition than the thunderbolt system that has the sensor you speak of. Mpi fires off crank sensor . the crab style distributor caps on mpis are known to cause misfires has your been changed
  9. Scott06

    Gen 1 305 swap with gen 2 4.3

    if the guy is swapping complete bobtails even with crank vs flywheel mounted coupler wouldn't matter. Pre '82 the rear motor mount spacing is different, but that is a different animal than what the OP has.
  10. Scott06

    Gen 1 305 swap with gen 2 4.3

    I did a 4.3 to 50/305 swap on a 2004 sea ray 200 sport. You need about 4” in front of the 4.3 as the 305 is longer. Side motor mounts will also be about 4” farther forward. My boat was offered new with 4.3 and 5.0 engine options so I had space in front and the engine mount stringers were long...
  11. Scott06

    Mercruiser 470 Rod Bearing

    Would also agree they prob are std but I woild Measure the crank joirnal To confirm size. Never know if someone has been in there before
  12. Scott06

    Won’t Start in the Water

    So when it was on the water were you missing fuel or spark? think the water vs on the hose is just coincidence. Maybe loose connection at cannon plug ?
  13. Scott06

    Cold engine despite running for a while. Water entering bilge

    No only temp sensors are the sender for the gauge and the alarm over temp switch . Both are in the thermostat housing
  14. Scott06

    4.3 v6 Timing suggestion

    I think typically you see the 4.3 having less total timing than the 5.7, somewhere around 24 or so With vortec heads . Due to the load on marine engines they are more detonation prone so comparatively you see marine ignition curves be more conservative in terms of total timing what you outline...
  15. Scott06

    Mercruiser 5.0 no power to fuel pump when ignition ON

    Yes shift interrupt can be tripped and block spark. Just disconnect the wires take wire from coil off dist cap hold close to a ground like engine block, crank engine you will see spark if coil is making a spark. definitely disconnect the tach if it is broken . Some mercruiser have separate...
  16. Scott06

    So, my 2025 Bayliner VR5 200 hp 4.5L mercruiser STILL barely pulls me up

    High five sucks in some cases. I tried it with same goal in mind was a waste of time vs the 4 blades (Rev4 and Vensura/Offshore). spun up fast but had wicked slip at higher rpm, basically got on plane and was nipping the top end right away, no balance between holeshot and cruising speed. Also...
  17. Scott06

    Mercruiser 5.0 no power to fuel pump when ignition ON

    It looks like you’re losing voltage through the key switch indoor helm if you only have nine votes volts at the coil I don’t think that’s enough for a thunderbolt ignition I would try to jumper 12 V two positive side of coil directly from the battery and see if you get a spark. If you do at...
  18. Scott06

    Merc 3.0 alpha one gen 2 water in bilge

    Put boat in water look in there with scope camera turn drive side to side and up and down While yes you likely won’t sink if water fills stern will be down and engine can get water in it and or ruin starter
  19. Scott06

    Powertech Red-3 & Red-4

    What did they say the RED are good for up high? If you havent talked to Ken at Prop Gods it might be worth a call as that is a name you hear a l;ot for these types of questions
  20. Scott06

    4.3 lt Mercriser Cranks But will not start on idle and will not idle.

    either fuel is not getting to fuel bowl or idle passages in carb are not clean. Either way when you dump gas down you are providing fuel until it burns off. When you advance the throttle you are coming off the idle to transition and main circuits that must be flowing fuel. My carb rebuilding...
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