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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    I did end up going with the Davis Unified unit (ended up having to buy 2 of due to Fedex "delivering" the first one when it actually wasnt. Before the install I also upgraded the shift interrupt to the new style with the bracket. Didnt realize my shift interrupt hasnt been working for awhile...
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    Boat switch panel and mystery button

    The boat is a 1989 Cobia 265fc. On the switch panel with the ignition, blower, and horn there is a mystery button that Im not sure what it does. The button isnt fused and seems to have a constant 12v to it. I have to take some of the boat apart in order to trace the wires going to it, but...
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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    The plug that goes into the timing advance module on thunderbolt IV system on the passenger side riser - mine is the v8-22 version.
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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    Just got back from the boat with some updates. I started right up and timing at high idle was 9 degrees. It ran for awhile but it was rough. Tried to go back to normal idle and the boat cut out and then wouldnt restart. Its the same issue I had last year that I fixed by messing/cleaning the...
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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    That actually the trim unit power - i had the trim tied up and out of the way and had it disconnected when I was glassing. That was a pic from years ago.
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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    Thats just from when I reglassed the bunks on the sides and had everything tied up and out of the way.
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    1989 5.7 350 Mercruiser ignition replacement help - possible upgrade to DUI unit

    I have a 1989 Mercruiser 5.7 and the Thunderbolt IV ignition has left me dead in the water 3 times now (good thing I have a kicker). 1 time was a coil, one time with rotor busting, and one time with the timing advance module flaking out (actually more than once with this one). Starting to have...
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    Throttle handle removal from older Quicksilver throttle binnacle

    Awesome - I was able to remove the handle. Problem is now I cannot find any source for a complete handle or just the knob. I guess I could try 3d printing the knob.
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    Throttle handle removal from older Quicksilver throttle binnacle

    Any ideas on how to remove this handle? I already removed the neutral button but I dont see how to remove the actual handle itself. Any suggestions?
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    Want to make underwater removable hardware - West Epoxy with 404?

    I did a stringer rebuild and ended up having a leak that went into a compartment that was not accessible. I put a access cover on it now, but I want to make sure the leak never comes back. The leak was coming from a screw mount on the trim tab plate. It had 4200 on the screw, but after a...
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    Bilge stringers and decking - material check and advice needed

    Good thing I took pics and documented. Im about to put some 5" holes in the deck to put in some circle hatches and I dont have the pics on my phone anymore. In regards to the pourable compound - its been rock solid so far and the engine hasnt moved a bit with the bolts mounted in it.
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    Looking for a replacement throttle box

    The top black part cracked and its now tends to spin when shifting. I looked and cant find a replacement. Anyone know a part number I should be looking for? Its hooked up to a Mercruiser 5.7 I/O with a Alpha One.
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    Mercruiser outdrive blew up with 6 hours on a reseal - what do do

    Mercruiser Alpha One - Gen One (1.47 ratio hooked to a 5.7L) Had a bad yoke seal and was allowing gear oil into the bellows. Had all of the seals in the entire unit replaced and the yoke replaced. All work was done by a shop in spring for $1200. With less than 6 hours on the reseal, the drive...
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    Mercruiser 5.7 Alpha One 1.47 not shifting at all

    Was powering out to go fish and suddenly lost momentum and the RPMs spiked. Turned it off immediately thinking I spun the prop. Started it back up and had no fwd or reverse at any RPM. At the time I was thinking with a spun prop I could at least get it to grab at a lower RPM. So we ended up...
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    Bilge stringers and decking - material check and advice needed

    Glassed the top side of the floor and then faired it out with thickened epoxy.
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    Bilge stringers and decking - material check and advice needed

    Took a 1/2 piece of marine ply and glassed the backside of it. Once dry, then laid it in a generous fillet of thickened epoxy.
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    Bilge stringers and decking - material check and advice needed

    Glassed in 2 marine plywood stringers and a cross member support for the floor. Used multiple layers of 17oz biax and West Epoxy.
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    Bilge stringers and decking - material check and advice needed

    Next I took some 1/2 plexi and built a mold/dam against the engine mount/stringer. Surrounded it with plumbers putty and some tape. The used CarbonBond and poured through a 1 inch hole in the top of the engine mount. The engine mount bolts were inserted with wax release agent around them. Let it...
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    Bilge stringers and decking - material check and advice needed

    One side mostly cleaned up and some minor glass repair on the mounts.
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    Need some help with getting the wood out of an engine mount and stringer

    I took all of the old wood out under the bunks in the bilge but cutting the entire bunk out. However, when it came to getting the stringer and mount under the engine out, I'm having some issues. The bottom was soft on the stringer so I was able to get it out fairly easily. However, the mount...
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