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  1. ESGWheel

    Confusion on 5.0OSi-E motor

    Your original post highlights you were experiencing loss of power “for a while” prior to the knocking developing. One possibility is due to unnoticed low oil pressure the bearings were heating up excessively and thus binding causing the loss of power. Continued low oil pressure finally resulted...
  2. ESGWheel

    Mercruiser 120 poor starting

    Guffer, If there is an award for perseverance you have won it 10x over! For the comment about getting spark at the points > while there is going to be a smallish one, you are correct to think that if its excessive then the condenser (which is really a capacitor) is bad. A strong spark at the...
  3. ESGWheel

    Confusion on 5.0OSi-E motor

    Diagram shows only one and i have never questioned it. I'll take a look next time i'm in there. As for 2 sensors: a lot of V8s in cars have 2 sensors, one for each bank, not a back up.
  4. ESGWheel

    Water in Oil

    Follow up: If you are not going to pull the motor and do a rebuild suggest doing the following as soon as possible if you have not already: With the high-tension lead to the distributor grounded out and all spark plugs removed: Crank the motor to ensure all the water in the cylinders is pushed...
  5. ESGWheel

    Replacing my power block

    Don't forget the distance to plug into the calculator (link) is the run there and back, ie both directions.
  6. ESGWheel

    Confusion on 5.0OSi-E motor

    I have a 5.0 GXi-E and there is not a wiring diagram for this MPI (PFI) engine. However, based on a lot of hunting around on this forum, I have come to understand that the schematic for the GXi-C is the same, attached. While I have not tested this wire for wire, I have found it to be correct. I...
  7. ESGWheel

    Water in Oil

    The most conservative thing to do is to flush the engine on muffs or the flushing port is equipped. While you are in a lake and can probably get away without doing this except at the end of the season, flushing certainly only helps and cannot hurt. Run the engine at idle until running temp is...
  8. ESGWheel

    Water in Oil

    Thanks for the picture. Odd that hole did not hole did not rear its ugly head during the test run as it looks like it’s been there for a while. And Lou’s link had a picture of the older style ‘batwing’ so good there too. Please define what you mean by free play: axial or radial. See pic for...
  9. ESGWheel

    Water in Oil

    Well, this is good news that you found the issue. While I like to try to help, I am also trying to learn. I am a ‘lifelong learner’ as they say. As such I am not familiar with the one-piece manifold and riser so could you please post a picture of it? Also, I would be interested in the cylinder 6...
  10. ESGWheel

    Water in Oil

    Thanks for the background. Frankly I am having trouble connecting the dots. Dot 1 > oil looks good and took it for a test drive, all is fine Dot 2 > Put it on the trailer and took it home Dot 3 > Decided to change oil and found water in the oil and stbd side cylinders. What I am struggling...
  11. ESGWheel

    Water in Oil

    Can you provide the history of this motor and what was going one prior to this discovery of water in the oil. Example it overheated and had to be towed home, etc.
  12. ESGWheel

    Starter Not Engaging

    This is good news and happy to have helped. And while good you have a solid system per se’ the idea of “It’s just electrical” can be one of the more frustrating troubleshooting endeavors. So again, a logical approach needs to be adhered to, just like you already did. Here are some...
  13. ESGWheel

    4.3 GL Starting issues.

    I’ll take a quick stab at this but I do not have your wiring diagram so this may be incorrect. However, your picture of a starter is a 4 terminal type so I am guessing that there is that 4th wire that did not get reconnected. Let me explain: Some electrical systems, and I assume yours too, will...
  14. ESGWheel

    Starter Not Engaging

    again, please do not try a jumper cables directly to the starter, only to the battery... thx
  15. ESGWheel

    Starter Not Engaging

    Our posting crossed. OK so no voltage at the Y/R wire so troubleshoting time. If desired, you can “jump” from the POS battery terminal to this terminal to check the rest of the system (starter works, and if does good connections exist). Make yourself a jumper wire (same size wire as the Y/R)...
  16. ESGWheel

    Starter Not Engaging

    DO NOT use a battery charger to try to start the engine. Only specialty equipped chargers can handle that type of current (read: professional grade for garages). If you have one that claims will start an engine (Start Mode) I suspect that it’s like one of those battery jump starters and may work...
  17. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Agree to not cut into metal fuel lines > again I was thinking u had mechanical and thus rubber hose feed. Take a look at your set up and see if there is an easy way to test fuel pressure. Regardless, yes, you can get a cheap fuel pump and try that and if all works out decide if you get a second...
  18. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    With the carb'ed engine i assumed. So yes those can go. Need pressure gauge.
  19. ESGWheel

    Rough idle and dies when put in gear

    Agree tough to believe in coincidences. One possibility is the dist cap got smacked and has a crack causing it to intermittently short out so not running on all 8, or an ign wire got damaged. When at the boat and idling, run your hand around the dist and along the plug wires. Get a tingle or...
  20. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    No water > good. And yes the correct process. I was going with it only stubbles underway and only at 3k and only occasionally which was really odd. And yes, this does sound like a fuel issue, but where? While it’s possible to be the fuel pump, these mechanical devices typically outlast the...
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