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  1. Kola16

    Mercruiser, which engine model do I have (no serial number)

    What pitch prop do you have and what is the performance of your boat? Eg. Speed vs. RPMs. Also what is the weight of your boat? And is it carbed or MPI? The 5.7 and 6.2's can use all the same external parts, many times its the internals that are the only difference. The performance can usually...
  2. Kola16

    86 mercruiser alpha one 140 does not go under load

    Do you smell burnt rubber when you throttle up? If you do, look at your engine coupler. That is the part at the back of your engine that connects the engine to the outdrive. It will spin like your hub on the prop and if it spins it needs replaced.
  3. Kola16

    Is My Impeller Bad? Mercruiser 228

    It was antifreeze in the cylinders. Fully closed system. I'll have to put it all back together to test it then. I have the manifolds, heads, and heat exchanger taken apart now.
  4. Kola16

    Is My Impeller Bad? Mercruiser 228

    Weeeeell, I took the spark plugs out, and sure enough, there was plenty of water in the port side cylinders. I still haven't seemed to find water in the oil though. I am going to pressure test my heat exchanger while I have it out (why not). Should I also pressure test the block where the...
  5. Kola16

    Is My Impeller Bad? Mercruiser 228

    I have run this cooling system for about 200 hours and never have had an overheating issue. So 200 hours ago would be the last time it was cleaned. The FWC was installed by a boat mechanic when I did the engine swap. The only raw water I have coming in is the impeller in the outdrive. No other...
  6. Kola16

    Is My Impeller Bad? Mercruiser 228

    It's in the title and my bio sorry haha. Bits and pieces. My brain scatters. Mercruiser 228 is a 1979 system that was originally a carbed 305. Now it is a 350 with throttle-body injection, but still the MC-1 outdrive. Fresh-water cooled.
  7. Kola16

    Is My Impeller Bad? Mercruiser 228

    Update: I just put 3 quarts of antifreeze in the system. Now it is running back at 170 F (digital gauge) at 1500 RPMs on the hose. And my IR temp gun at the thermostat housing says 170 F on my gauge is actually 155 F. That is the outside of the thermostat housing and manifold of course, but that...
  8. Kola16

    Is My Impeller Bad? Mercruiser 228

    Okay long story. It is still running hot. The overheating was not because of the impeller, although it was good to replace it thanks all. The engine threw the belt that runs the water pump and the alternator. That is why it overheated. I did replace the impeller and housing though...
  9. Kola16

    Is My Impeller Bad? Mercruiser 228

    Good to know. I have run it on the hose at high RPMs many times over its life. Will not do that any more I guess haha. Just ordered an entire new pump kit. Thanks!
  10. Kola16

    Is My Impeller Bad? Mercruiser 228

    My engine is overheating and I am trying to track down why. Below are the pictures of my impeller. The video is of the outdrive hooked up to a hose running at idle and WOT. What do you guys think, is that how much water it should be pumping or should it be more? The outdrive is an old MC-1...
  11. Kola16

    How Much Voltage Drop Is Too Much?

    Thanks for the replies y'all. Almost all my wiring and gauges are the original from 1979 so you confirmed my suspicions. I also left the key on and drained my cranking battery twice. I did not realize it was weak since it charged right back up and kept 12.45 volts. Rewiring my boat it is, along...
  12. Kola16

    USB charger

    I put a double one of those in my boat about 5 years ago. Still charges without a hitch. If I remember right, it was like $6. I put mine inside the cuddy though so it is very protected from the elements.
  13. Kola16

    How Much Voltage Drop Is Too Much?

    Howdy all! I am trying to determine whether my wiring harness and instrument cluster has too much resistance and draw and needs updating. With my 3-wire ignition switch in the off position, the hot wire reads 12.45 volts, which is what the battery reads. With the switch in the run position...
  14. Kola16

    Tachometer Bouncing Causing Engine Surging

    I mentioned I tried that in my long-winded post, but good suggestions. I found the problem though! The positive side of the coil was only getting around 9.5 volts! The Pertronix wants 12 volts. The positive side of the coil is where the Pertronix gets its power from. I do not think there is a...
  15. Kola16

    Tachometer Bouncing Causing Engine Surging

    It says it is self-tuning so we will see if I get the darned thing running properly. I can manually change the AFR per the RPMs too. It has Coast Guard compliance so I'm hoping it works. When the tach isn't on drugs it sound great on the hose.
  16. Kola16

    Tachometer Bouncing Causing Engine Surging

    I see the confusion I created. When the carb was on it, the tachometer would bounce around but the actual engine RPMs did not change. The tach would just momentarily read wrong. With the sniper on it, the tach will bounce and the Sniper will inject fuel thinking it needs to for the increased...
  17. Kola16

    Tachometer Bouncing Causing Engine Surging

    Hello all. I need some schooling on how the RPM signal is generated. I just replaced the carburetor with a Holley Sniper EFI system on my Mercruiser 260 setup (old carbed-style GM 350). My tachometer and the Holley Sniper unit will jump up and down in RPMs when that is not what the engine is...
  18. Kola16

    2012 F20 Starts, But Putters Out Quickly

    Took the boat duck hunting yesterday in as rough of seas as a 14' with a 20 horse can take. Nice cold Washington saltwater spray in the face at every wind wave. Engine performed flawless for the 5 miles out, and 5 miles back. Didn't die once and have dinner to show for it!
  19. Kola16

    2012 F20 Starts, But Putters Out Quickly

    Well I took the carb apart a second time and shot compressed air through all of the jet and followed it with carb cleaner. I found that two jets might have had a tiny bit of what appeared to be gasket glue or something in them. Anyway, I cleaned it all up, put it back together and back in the...
  20. Kola16

    2012 F20 Starts, But Putters Out Quickly

    Yes I have. The primer ball has hard to pump, and I'd like to think it ran a little better, but I'm not sure that it did... I did check the carb gaskets and they appeared fine, but a rebuild kit never hurts. Just strapped on cash right now. I didn't try a different fuel line because I do not...
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