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  1. hoowahfun

    3,0 Only Firing on 3 Cylinders

    Hey everyone, I discovered today my boat is only firing on 3 cylinders. I discovered this while trying to diagnose a no-start issue which I think was the result of a collapsed fuel filter. Along the way I started investigating the ignition system after I checked off everything on the fuel side...
  2. hoowahfun

    Collapsed Fuel Filter

    1987 Mercruiser 3.0, S/N B515218. Has anyone ever seen this happen? Fuel filter crushed and starting to separate. Came in a fuel pump I bought on Amazon less than a year ago. Any thoughts on what could cause this? Cheap junky parts maybe? I've only had this boat out two times since I bought it...
  3. hoowahfun

    Troubleshooting Trim Gauge/Sender

    hi everyone. I installed a new trim sending unit and limit switch this weekend with new wiring through the transom housing and hooked everything up. I turned the key to the “On” position, and the trim gauge just stays pegged all the way up. It stays that way whether key is on or off with no...
  4. hoowahfun

    Emergency Kill Switch Wiring

    hi all, trying to wrap up some loose ends (literally) to get my project boat on the water. I discovered that the emergency kill switch is not wired up and I’m not sure which wires to splice them into. I’ve got a purple and purple/white wire coming from the switch, but haven’t been able to find...
  5. hoowahfun

    Dumb Prop Question...

    Okay so here's what may be a dumb prop question. My existing prop on my project boat is mangled so I removed it to replace it. It has a removable hub that looks like it's in good shape. Is it a bad idea to use a fixed hub prop as a replacement? Found a used Michigan prop in good condition for...
  6. hoowahfun

    3.0 Won't Start After Installing Outdrive/Filling Tank

    Mercruiser 3.0 and Alpha One Gen 1 Outdrive, motor S/N B515218. This motor ran with the outdrive removed. Here's what I've done since it last ran: 1) Replaced gimbal bearing and aligned with engine. 2) Replaced all bellows. 3) Replaced impeller and all gaskets, o-rings, etc. 4) Changed the oil...
  7. hoowahfun

    Gimbal Bearing Removal Trick

    I removed the gimbal bearing today and wanted to share something that helped me remove it, and share something that didn't work. I rented a 5 lb slide hammer from NAPA along with a puller attachment shown in the photo. Note that this attachment will NOT work. Even with it adjusted to spread the...
  8. hoowahfun

    Harmonic Balancer Part#/Compatibility

    Just to follow up and close this one out, part number 3826292 was the right balancer for my engine. Got it new for about $60 including shipping online and it was a GM part. Got the old one off and new one put on today. I will say from that experience that having the right tool for the job is a...
  9. hoowahfun

    Harmonic Balancer Part#/Compatibility

    1987 3.0 Mercruiser 130 HP, S/N B515218 I'm in need of a replacement harmonic balancer since the outter ring of the one currently on my engine has slipped. According to the Mercruiser part catalog there are two different part numbers: 55045 and 8M0086946. Here are my questions. 1) Why is there...
  10. hoowahfun

    Interpretation/thoughts on compression test results

    Engine is a 1987 3.0, S/N B515218. Engine is currently not running, and wanted to do a compression test as a start to some diagnostics I want to do on the overall engine. Engine was seized when I got it, but freed it up after soaking the pistons for a few days and changed the oil. Engine dose...
  11. hoowahfun

    Questions about 87 3.0 Distributor with Petronix Ignitor Setup

    Hey everyone, I've been working on a new to me boat to get up and running that has an 87 3.0 Merc in it. I installed a new starter this past weekend and while checking if it would turn over noticed some puffing/backfiring through the carb (twice) and through the exhaust in the outdrive once...
  12. hoowahfun

    Core plug sticking out a little...bad?

    Hi all, I have a new to me boat and was doing some work today on the alternator and noticed something odd about the core plugs beneath the exhaust manifold. Engine is a 1987 3.0 merc. The plug on the left is ticking out maybe 1/8" or so while the one on the right is flush with the block. The one...
  13. hoowahfun

    35th Americas Cup - June 17, 2017

    Hi everyone, somewhat of a new member here. I mostly read through the Mercruiser engine repair forums and don't know much about sailing. However, I had an opportunity to go to Bermuda this past weekend for the 35th Americas Cup. Saw some nice boats and got some unique photos I thought I'd share...
  14. hoowahfun

    Starter testing with damaged solenoid...

    Hi all, been reading this site for a while and recently got a new to me boat in need of some work. Boat is a 1987 Sea Sprite 195. Engine is a 1987 3.0 Mercruiser, 130HP, S/N B515218. When I turned the ignition switch I hear a click/clunking sound coming from the general area where the starter...
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