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    Mercruiser thunderbolt IV ignition module

    The oem ignition sensor comes with a splice kit to connect the older style ring terminal shift interrupt switch and module leads to the latest style bullet connectors If you purchased an aftermarket sensor I don't think it comes with a splice kit
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    2008 Mercruiser 5.0 tks won't go into drive or reverse

    Is the outer cable routed correctly?
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    7.4/Bravo - no hot start

    Definitely ignition and carb inspections needed. Check for the fuel dribble upon shut down, like Rick says it's common on webers For ignition definitely need a spark check upon no start, especially when hot. Yeah, thing runs great for a long time but the engine gets hotter upon shutdown, heat...
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    Replace Bravo2 Lower Unit W/ Bravo

    Dang, did not interpret that part. As dodge says, older gen bravo drives went through some internal passage/alignment changes. I read it as swapping an entire drive In any case OP should stick with a bravo 2. Yeah, hard to find used lowers but you can still get oem
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    Replace Bravo2 Lower Unit W/ Bravo

    Bravo 1 is designed for higher performance and speed Bravo 2 is designed for moving larger hulls at lower speeds. More for commercial applications like barges and larger displacement style hulls with single sterndrive in the 27-30 foot cabin cruiser range. You can absolutely use a bravo 1 in...
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    MerCruiser 3.0 TKS Overheating and activate alarm

    Would guess from the overheat the flapper was melted/destroyed and the pieces have fallen to the bottom of the exhaust pipe and are blocking the idle relief port.. Pull the drive and check the exhaust bellows, exhaust passage on the drive and the exhaust pipe/gimbal housing area for flapper parts.
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    1988 4.3 ltr engine starter wiring

    The title of this thread would suggest otherwise Pull the spark plugs out and remove the drive. Have you tried rapping on the starter itself to see if it's stuck?
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    Alpha 1 Gen 2 Gimble Bearing Grease Nipple

    Waste of grease when someone installs a permalube bearing and does not abate the zirc. So lazy.......
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    Fuel System questions for Mercruiser 260 EFI Conversion

    If I were installing this system I would keep the oem mechanical fuel pump and water separator. The mechanical pump will provide plenty of flow for the high pressure pump as long as it and the supply system from the tank is sound. I would only use pressure rated, braided fuel line after the...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Erp......correction Windsor/small block engines, not 335 series....
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    Ethanol treatment

    No additive will erase ethanol in your fuel. If the fuel contains ethanol, that's it, no changing that. Most marine engines are okay with up to 10% ethanol gasoline. It's during extended non use that ethanol causes issues, e.g. water contamination, phase separation, etc... As long as you're...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    The orientation of the pump in the velvet drive changes the rotation of the transmission/output for fwd/rev The cut of the gears on the distributor/camshaft is how the rotation of the distributor shaft is maintained to be the same for lh and rh rotation engines. Ford did the same thing on...
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    Repair Manual for newer MerCruiser 4.5L 250hp

    The only place to get an oem manual new is from mercury. You may try eBay. Thermostat is located in the usual area for a v engine. Fwd end of the engine, top area for access
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Yes, that is the gm sbc counter rotated (rh) engine firing order. Just came to say on most twin inboard engine set ups the standard (lh) rotation engine is the port engine. Stbd engine is counter rotated (rh). Not saying that it what you have or that you are wrong. 1984 was a while ago and...
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    Digital Throttle/Shift (DTS) Shift Adjustment ???

    Def early for clutch issues. But if adjustment is off or other issues exist that can be cause for failure FYI clutch pictured isn't glazed, just shiny. Glazing is when the high point on the face gets "smashed" from lack of maintenance, poor lube quality, misadjustment or abuse. Abuse being...
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    5.7 Vortec Runs Great On Land but Bogs Under Load in Water

    I think a tune up (baseline) is in order. Guessing t bolt ignition, sensor on the dist can cause issues too...... Funny how you have a weber carb but suggestions on how tos on holley are suggested
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    when do you know your flappers need to be replaced

    If the motor is out and you have eyes on the flappers, check the outside area that contacts the y pipe. If there is wear/metal (or plastic) exposed, e.g. the rubber is gone, replace. My best guess is if you've got easy access, just replace. Simple task just costing parts $, ymmv
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    Digital Throttle/Shift (DTS) Shift Adjustment ???

    First thing I'd do is verify the throw of ghe actuator. Don't have a spec but you have a good shifting system, measure that one and compare. Next I'd verify lower shif cable adjustment, can be done with the plastic tool on the shift plate. If all is good then you're looking at a drive pull and...
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    Mc-1 upgrade....

    Unless you have access to multiple abated transom and drive equipment, a budget is out of the question. If you have knowledge and time you can scour used online market, or local postings with drive time/inspection included. Then you'll save money, but not time/work
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    Mercruiser 233 Overheating--Out of Ideas

    That sounds like enough water supply to me. Seeing as hiw you've got a basically entire new cooling supply and removal system have you checked the outflow of cooling water from the exhaust? After the risers the y pipe exits the exhaust gases and cooling water. Don't rule out a blockage in the y...
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