Search results

  1. D

    Mercruiser 383 Mag Stroker MPFI Bogs Over 3000 rpm

    Those spark plugs are toast, fouled with excess deposits. Reviewing the pics posted I'd guess this is a saltwater boat with raw water cooling? Based on the patina and other aspects I'd guess the distributor cap needs replaced at a minimum. Doesn't appear that the risers/manifolds have ever been...
  2. D

    5.7 MPI Misfires Under Load

    Nothing abnormal looking to me. The voltages follow the sensor movements pretty close and are within the 5 volt range. With no faults present there's no reason to suspect an issue with the 5 volt ref from the ecm. With a graphing/recording of data you look for consistency (which you have) for...
  3. D

    Mercruiser 383 Mag Stroker MPFI Bogs Over 3000 rpm

    37 psi is close to spec but should be more around 42 psi steady at all rpms/load. Based on the fuel supply troubleshooting it's possible the high pressure pump is faulty. Only other test I can think of is a fuel supply vacuum test or running on a remote fuel tank. A faulty in gear/neutral...
  4. D

    Intermittent Alarm Beep - Mercruiser 5.0 V8 MPI

    Agree with FT. Check for a depth sounder alarm among other accessories The audio warning system mentioned has a built in test for proper operation. With the key in the run position engine not running it should sound constant or at least for a few seconds depending on engine model. Key on...
  5. D

    Bayliner Capri very hard to turn and engine wouldn’t start on the water

    90% of the time hard steering is the steering cable between the helm and tiller arm at the transom assy. Some 3.0 liter mercruisers do have power steering. Easy check, if the engine has one v belt, no power steering. Two belts, has power steering If your engine isn't equipped with power...
  6. D

    5.7 MPI Misfires Under Load

    Tps graph for sensor and voltage appear normal. Can tell the throttle remained open/steady during the hesitation event. The iac sensor chart seems to closely follow the variations in rpm. Might try unplugging the iac once the engine is above 1000 rpm or so. Should not affect the performance at...
  7. D

    5.7 MPI Misfires Under Load

    I would think at idle speed the iac would be cycling at least a bit in the upper % range. Seems stuck near 98% with a sudden drop. Did you adjust throttle position at/near the drop? An iac is a common failure component on mpi engines and will cause running issues without triggering a fault...
  8. D

    Gears with engine off

    Information referenced in post #5 is in regards to a mercury outboard not an alpha sterndrive. Outboard clutches often times have square lugs for reverse engagement thus not ratcheting in reverse gear. Mercruiser alpha style clutch dogs have for many many years contained ramped teeth for both...
  9. D

    Im fed up with this Boating life.

    Disagree, I've owned a snowmobile If the ignition and fuel supply system are sound I'd be suspect of the engine mechanical, i.e. long block
  10. D

    Outboard lifter was struggling.

    The partial seal and keeper pictured stuck on the ram indicate an end cap/seal replacement at a minimum. Agree with others there may be more issues not yet obvious If you primarily operate the boat in saltwater you should be using zinc anodes only. Aluminum will only help halfway, magnesium...
  11. D

    When I turn the key starter rapidly clicks

    Use a known good battery and test again Inspect/clean all connections related to the starting system as well
  12. D

    When I turn the key starter rapidly clicks

    If the battery is more than three years old it would be suspect, especially if it died from a constant auto float bilge pump running. If the starter was at or below the surface of the water it surely needs replaced
  13. D

    Electronic fuel pump.

    Mercury engineering implemented this system many years ago. Pretty well known among folks here and in the marine repair field Unless you have proof of failure of a mechanical pump there's no reason to replace it or even abate the system. There are many styles of mechanical fuel pumps still...
  14. D

    2018 V6 200 J Oil pressure dropping and alarm

    The oil filter housing assy has a bypass valve in it to alleviate issues from a clogged/faulty oil filter. Do as scott recommends, change oil and filter. Use VP 10w-40 full synthetic oil and an oem filter, lake test and note results Also would reiterate the advuce of a new sea water pump...
  15. D

    Mercruiser 4.3MPI 2011 Leaking from bowl where cooling hoses go into

    I believe the fitting is one assembly even though the schematic breaks it down into several parts. #8 portion of the assembly threads into the bottom of the manifold and #9-11 are attached to it. Pretty sure it's "non serviceable" and requires the entire assembly be replaced. The assembly is...
  16. D

    Engine just clicks but no start

    As in acceptable vs. unacceptable continuity of a part of/entire circuit. Most easily measured in voltage drop with a load applied I also agree with Q's mention of possibility of hydro lock. My common experience with 470's is they are either pristine one owner fully maintained gems or...
  17. D

    does anyone know?

    Based on the photos you've provided it appears to me the seat portion of the petcock assembly is missing. The "wing nut" (movable) portion pictured threads into the seat portion (stationary). The seat portion is pictured in post #14, item in the left of the picture. Your pictures of the movable...
  18. D

    Maintenance - New owner of 89 Mercruiser 4.3L Alpha One

    Yes to all 5. Don't comprehend French but the lube looks like it says high performance gear lube, 90 wt is what you need. A fuel/water separating filter is a good idea to change, most likely a spin on/oil filter type if equipped. Otherwise there is a filter in the fuel pump that should be...
  19. D

    Gear oil reservoir system - 1988 vs 1998 Bravo TA

    No problem, if/when you decide to upgrade it may be in your interest to upgrade to bravo 2 or 3 drives. I'd reckon to see bravo 2's oem on a '34 DA of that vintage opposed to 1's but I've seen weirder things in the wild. Hull design on the '30-'40 class have changed a bit for the DA's since...
  20. D

    trouble getting reverse.

    Based on the photos posted your best option imo is to replace the entire engine assembly. My guess is the rest of the propulsion system is in similar condition and most likely needs replaced. The clear covered box in the photos is a gray water (sump box) often used to remove shower drain water...
Top