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  1. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    2004 Mercruiser 4.3L Thunderbolt V Alpha 1 Gen 2 Engine S/N: 0m670495 Crownline 180BR I took the boat out of storage today. It ran perfectly fine for about 30 minutes at varying rpms along our ride. After the first stop, we took off again and I normally like to cruise at about 3000rpm/22mph...
  2. M

    Merc 4.3L - Wiring and Idle Adjustment

    2003 Mercruiser 4.3L V6 Serial #: 0m670495 Two Questions, not sure if they are related to each other which is why I am posting both questions in the same thread. 1. Can somebody tell me what the two wires I have pictured and circled in red are for? One of them is capped, the other has some...
  3. M

    Mercruiser 4.3 Steering

    Iv noticed my steering has become more and more stiff while out on the lake. After doing some research and reading, Iv decided to order a new steering cable. I removed the old one to properly measure it. After I got done and was cleaning up, I noticed that my drive was turned to one side so I...
  4. M

    Adding gear lube

    Saw somebody talk about this on another forum, which sparked my curiosity so I figured I would get all of your thoughts on it. 2004 Mercruiser 4.3l with Alpha1/Gen2 drive Pulled my drive and replaced seals on it recently. In doing so I needed to drain all of my gear lube. I also found a small...
  5. M

    Winterizing Mercruiser 4.3 question

    Watched a bunch of videos on YouTube and thought I had this winterizing thing figured out. However, I realized after watching that my engine differs slightly from those that I have watched. I have attached a picture of my engine, it has an extra set of hoses going into a “T” on top of the...
  6. M

    Digital Hour meter - counting intermittently

    2004 Mercruiser 4.3L in a Crownline bow rider. Hour meter is a digital readout on the dash in the instrument cluster. It’s clearly getting power because it turns on and displays the hours. But several hours will pass and the meter won’t change. Then for whatever reason it will begin counting up...
  7. M

    2004 Mercruiser 4.3L Oil Leak

    I started noticing sandy brown water in my bilge about a month ago. The water isn’t an issue, I constantly have people getting in and out from tubing. But the fact that it looked like oily water was an issue. I then began to notice that over the course of a few weeks the oil on my dipstick...
  8. M

    Prop Help, Speed issue?

    I just purchased a 2004 Crownline 180 Bowrider. This is the first bow rider I have owned, as well as the first I/O iv owned. Spent my entire life on fishing boats with outboards, decided to trade it in for something more suited for the family. Anyways, the boat has a 4.3L Mercruiser v6, 1:81...
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