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  1. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    I may have miss-spoken or perhaps you misunderstood... The impeller pump was my first thought, especially after seeing that no water came out of the inlet hose to the engine's water pump. I pulled the lower immediately and I already have two spare pump kits on hand - I have no intention of...
  2. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Just an update to bump the thread while I wait for the final re-assembly and test: Replaced port exhaust bellows that was all torn up. First time doing this and got the expander tool. Went ok, not too bad of a hassle. Lots of corrosion on the gimbal and bell housings - will be taking apart this...
  3. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Update and answers to Kenny Nunez questions: Brought a proper hose to the boat (see previous comments) and re-tested back flow/flushing from the inlet hose to the engine's water pump back out to the bell housing - solid stream of water, no blockage at all. At least that particular water passage...
  4. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Not home, street and driveway too steep :-( Maybe a friend's house but not any time soon. I will re-try the generator/pump/hose setup tomorrow for back-flushing and see how it goes. Didn't find any clogs of any kind and impeller pump looked fine as I mentioned earlier. When I get the upper...
  5. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Disconnected the hose aft of the steering oil cooler from the plastic fitting in the transom assembly. I was able to pass a 6ga battery cable (5/16 OD) through the fitting, through the water hose that connects to the gimbal housing and out the hole in the gimbal housing (both upper and lower...
  6. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Sorry Bondo - poor wording on my part. I meant I took the pump out so I could clean and re-paint the lower unit... 🥴
  7. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Yeah, that's what I've read. I have a spare so might as well do it - boat's loud enough :)
  8. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Tore off the upper unit at lunch - nothing terribly unusual right off the bat. There was some crusty buildup around the water hole between the two units, maybe salt crystals. But no big blockage. Before I pulled it off, when I tilted the upper unit down, a bunch of water came pouring out - makes...
  9. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    I only pumped water into the inlet hose PRIOR to removing it from the cooler, not after. BUT, I did remove the hose aft of the cooler and checked both it and the cooler for obstructions - nothing noted. I shined my phone flashlight from behind the cooler and could clearly see the clean passage...
  10. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    @zellerj - Is this grommet at the top of the copper tube or bottom? The one at the bottom, inside the plastic pump cover, is there in the correct orientation. I have already taken the pump out of the lower unit for cleaning corrosion and re-painting but stored everything I removed in a bag - I...
  11. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    There is a hose that comes from the steering pump oil cooler and goes into the engine's water pump. I disconnected that hose at the water pump and pushed water into it w/ a hose. There should be no obstruction that I know of from there to the ground so I should have seen much more than a trickle...
  12. PosessionSound26PC

    1989 Mercruiser 4.3 LX, Alpha 1 Gen 1 Overheating

    Fixed my starboard's seized gimbal bearing and on the test cruise afterwards, port started to overheat AFTER idling at dock for a good 10 minutes with temp gauges stable. We were in a no-wake zone so very low RPMs/speeds; I killed the motor around 200F. This was last fall. It sat for a while...
  13. PosessionSound26PC

    Mercruiser 3.0 LX wont start after turning engine off. Video

    Not sure about your boat but mine has two filters - one at the mechanical fuel pump (maybe yours is electric?) and one at the carb where the metal fuel line goes in. They are both cheap and easy to replace - haven't done mine yet but have them and will do soon. Good luck!
  14. PosessionSound26PC

    Mercruiser 3.0 LX wont start after turning engine off. Video

    I just dealt with something VERY similar on my 4.3 LX - I went to winterize, warmed up my engine, turned it off because I forgot the fogging oil, came back and couldn't start it again for months as I was trouble-shooting it during the winter. I also had spark and gas and I tested the resistance...
  15. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    Pretty sure the diagram I linked to above does the same thing - it keeps the alternators from conflicting with each other as long as you don't set the switch to ALL (which is only used for low battery / emergency paralleling). Each motor has its own battery, separate from the other, even though...
  16. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    Hi @Bt Doctur , see my second reply below yours - wasn't sure if you get notified by a regular reply :)
  17. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    @Bt Doctur - I think I see where you're getting at. After a bit of research I think I am wrong about how my boat is wired - it is likely something more along these lines (diagram): 2 Motors, 2 Batteries, 1 Switch I will have to confirm this next time I'm at the boat this week. If that diagram...
  18. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    Could you elaborate a little bit on "bucking" and what you mean by "disconnected already"? This is the way the boat was designed (one switch), would take a lot of work to re-wire everything - not sure I have it in me. With the current set-up, it is advised to run on one battery? That's perfectly...
  19. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    I think I've sort of figured it out - One or both of my alternators may not be working properly or the belts are too loose or something is not right with charging. I bought new batteries last summer, installed them, and have topped them off w/ my generator and inverter once or twice while...
  20. PosessionSound26PC

    Starting Issue - Twin 1988 Merc 4.3's

    I have only one Perko switch mounted at the transom. When I changed the starters, I did voltage and resistance testing checks - both motors have the same negative/ground and regardless of which battery was connected, both starters had voltage on their main lines (so same positve as well). The...
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