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  1. M

    4.3 Thermostat housing

    I'm putting a new long block in my boat, and before it gets here I've been checking over all the other engine parts that I'll be keeping, the drive, gimbal, etc. When I was tearing it down I took note that there was no thermostat in it at all which was odd, so obviously I've been working on...
  2. M

    4.3 Rebuild, lifters?

    Short back story... 1990 4.3 fuel pump went out...main bearings were screaming for mercy so now shes on the shop floor getting some surgery. If I remember correctly, it was a bad knock and I believe a tick somewhere but I really didnt pin point it, I knew a rebuild was in her future anyway...
  3. M

    4.3 knock after fuel pump replacement

    Hey folks. Finally got a 4.3 for this boat in good shape, finally got it mounted up and running like a champ. Get it on the lake (8 hours from home... 😒), fuel pump goes... sent probably a gallon of fuel into the oil. I was running it at full throttle and heard a tick start, and at the same...
  4. M

    4.3 to 470 swap

    I know this is a little backwards, so that's why I'm having trouble finding just what I need. In the past i was planning on rebuilding the stringers and deck on my old boat, but recently I came across a structurally sound boat for a great deal, with a bad Mercruiser 4.3 and Alpha 1 outdrive in...
  5. M

    Replacing stringers in a fiberglass boat

    Howdy folks. I posted a question about fixing a seized MerCruiser 140 a little while ago, so you might recognize that i've got quite a project going on. I did away with fixing that motor and bought one that is also older, but runs like a champ. I really could listen to it run all night long...
  6. M

    Mercruiser inboard seized - lost cause or repairable?

    Hello. I'm fairly new to inboard motors, but I've got a pretty good understanding of motors in general. I bought a mercruiser motor, 140 Hp. From what I understand this is the 3.0, but I've been unsuccessful searching the serial number. It is older, and had been sitting outside for a while...
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