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  1. M

    Running boat on land with no prop?

    So with a OMC Cobra drive in a 18’ runabout. The swim platform needs to under the water to run the engine? Again I’ll ask ——- where are you people getting this information from?
  2. M

    Running boat on land with no prop?

    I should mention that this only applies to the MerCruiser “R” thru Alpha 1 gen 2 drives due to the spring loaded shift spool they use. one of the common problems I see with DIY shift adjustments is people put too much pressure on the shift spool causing it to wear out. You should have a fairly...
  3. M

    Running boat on land with no prop?

    That little hole isn’t for venting/primping, its on the pressure side of the impeller. It’s there for draining. This is one of the reasons MerCruiser tells you to lower the drive to drain it if the possibility of freezing exists.
  4. M

    Running boat on land with no prop?

    Facts from the Johnson pump marine catalog. The primary advantage of a flexible impeller pump is its self-priming ability. As the vanes of the impeller are depressed and rebound, they create their own vacuum drawing fluid into the pump. A dry pump can lift water up to as much as 3 meters. Thus...
  5. M

    Running boat on land with no prop?

    Wow, over 30 years as a marine mechanic/technician. Almost 20 years as a MerCruiser Master Tech. Attended every factory class they had. Never heard the instructors say that the water level needed to be any higher then the anti-ventilation plate. Ran 100s of I/Os in test tanks. Where are you guys...
  6. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    Agree that Ref # 54161345 + Ref # 54161344 look to be correct for your engine. You don't have a TCD or PCD. I've never worked on one of this style freshwater cooled engines. It looks close to the 6.0L, but that engine had a vertical heat exchanger. Low anti-freeze sure would cause the issues...
  7. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    !st thing you need to do is determine what cooling system you have on this engine. There are 4 different ones and what to do next depends on what you have. Inspecting the heat exchanger on an engine this old is always a good idea. Yes I highly recommend you have new end cap gaskets before...
  8. M

    Trim not work above 3000rpm (377Mag MPI DTS Axius)

    That's an understatement! I spent 25 years at new boat dealerships trying to correct these types of issues before the customer found them. I highly recommend you get your boat wired per MerCruisers requirements, it will help at a later time ---- trust me.
  9. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    Not sure what to think. Things were changing soo fast during these years, support material couldn’t keep up. This is why techs are trained in how the systems work, so when we get conflicting info we can find were the answer is. The diagnostic manual for the 2 serial numbers you have posted...
  10. M

    Trim not work above 3000rpm (377Mag MPI DTS Axius)

    And P.S. you should probably combine the threads if your other problems concern Axius. Like I said, everything is becoming interconnected. P.P.S. @tpenfield did you get your issues fixed? I don’t get the time to check the forum like I used to.
  11. M

    Trim not work above 3000rpm (377Mag MPI DTS Axius)

    So much depends on what Axius your boat has. Your tech could be right. Only problem I see at this point, the tech should have corrected a known fault (trim sender) before proceeding with anymore diagnosis. If you think about how this system works to allow joystick control. The drives can hit...
  12. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    TCD=temp control device PCD=pressure control device Yes I've seen the parts list. But what does your engine have? Don't have much time right now to look at the pics, did you post a pic of the O2 feedback monitor?
  13. M

    Ignition system common failures? 1994 7.4GL

    Will it idle with the screws turned in? Most of the testing is for a "no spark" issue. I'm a fix what you got (if you can) kind of guy. Serial Number?
  14. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

  15. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    I didn't get a chance to finish my post. EMWT= exhaust manifold water temp ERWT= exhaust riser water temp also when on Diacom look for EGT= exhaust gas temp. This is also a sensor you might have depending on what exhaust manifolds you have. The EGT is different from the water temp senders, it's...
  16. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    DTC = Diagnostic trouble code SPN / FMI = Suspect Parameter Number / Failure Mode Indicator Diacom displays engine DTC’s (for the –J model and later engines) in a 2 part format based on the J1939 protocol. The first number in the DTC is the SPN (suspect parameter number) and the second...
  17. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    Hi Lou, I’m sometimes a little leery to engage with someone who writes with such passion. Abominations? As in “a thing that causes disgust or hatred” or “a feeling of hatred” wow tell me how you really feel. But sometimes people post opinions that don’t quite match up with reality. Kind of...
  18. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    @Donald0039 I recommend that you. Volvo lists this engine as never being registered. Suggest you contact your local dealer and get this registered in your name. It's possible this engine is subject to factory recalls and/or updates. Because it was never registered nobody would have been...
  19. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    That will probably depend on if the OP is doing the required maintenance and replacing the exhaust manifold anodes as needed.
  20. M

    2012 VP 300 C-A Exhaust manifolds getting too hot - DTC 441 & 442

    Yes @Lou C is pretty much correct with the temperature needs of a catalyst. In the first years of cats. Volvo went with thermostats to control temps, MerCruiser used poppet valves. I thought at the time thermostats would be a more precise method. Turns out they are, but also have some issues...
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