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    Temp Sender

    On my 4.3L mercruiser (1994?) my temp gauge does not work correctly. The gauge does not move even when it the motor is up to operating temperature. When I ground the wire off the sender the gauge needle moves to full hot suggesting the gauge is ok. I am going to remove the sender and check...
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    Mercruiser Shifting Issue

    I have just replaced a 4.3L mercruiser and re installed the alpha one leg. (Bayliner, 4.3L Motor and drive are from 94) In the driveway it shifts forward to reverse very smooth. Idles around 650rpm. But in the lake while docking it required excessive force to shift between forward and...
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    Merc Trim Pump Questions

    While repairing a boat I purchased I noticed the trim fluid was a bit milky in the reservoir. (Mercruiser) I tried running the trim down then up. It stopped mid travel on the way up. Now the solenoids clicks in both direction but that's all. The pump is not engaging. Where should I start...
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    Power trim question

    Getting ready for start up after a mercruiser re install and I have noticed that the power trim resevoir on the pump is empty. (I have not removed any lines) I will top it up before trying it out but will it require bleeding ?. Thanks for the input, I am in uncharted waters.
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    Power Steering Question

    I have just re installed my mercruiser and have just re connected the power steering lines. Do I need to bleed it some how or will topping up the reservoir on the pump after running it do the job ? Thanks for any input
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    Electric fuel pump

    I installed an electric fuel pump on my 94 4.3L Mercruiser. I installed a oil pressure switch on the power feed to the pump. Do I need to run parallel wires to the dash to a spring loaded switch to prime the motor before oil pressure occurs or can I use the choke wire somehow. Or is this...
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    Mercruiser Wiring

    After re installing the wiring harness on my 4.3L mercruiser I have 2 wires left over that don't seem to be on the wiring diagram I have. They come from 2 different spots on the harness but they are both tan with a blue stripe. Could they be for some type of alarm? (1994 Model)
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    Electric Choke Question

    The small metal tab that you push the female electrical connection on to The electric choke on my 4.3L Mercrusier broke off. I soldered it back on. There is no resistance between the tab I soldered back together and the spring coil inside the choke. Once the choke is re-installed there is no...
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    Harmonic Balancer Compatibility

    I am building up a 4.3L for my boat. The pulley for my V belt wont fit the harmonic balancer on the replacement short block. The replacement short block had a serpentine belt and the harmonic balancer has an offset. Can I use my harmonic blanacer off my original 4.3L . The blocks are of...
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    Compatability

    When replacing a cracked 4.3L mercruiser block (gm casting 867) that was produce late 80's early 90's, can I use a newer 4.3L Vortec short block ? Will my heads (768) and intake fit the newer block? Will my flywheel bolts on ? Does it make a difference that the newer block is set up with a...
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    4.3L Broken Crank Questions

    I have a 4.3L Mercruiser with a cracked block (Not winterized correctly by the previous owner). I purchased a 4.3L motor with only 150 hours on it with a broken crank. I inspected it upon purchase. The only damage appeared to be to the crank and 1 piston. The block had no marks or...
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    Cracked Block

    I have a 4.3L mercruser that has a cracked block. Can I use a 4.3L block from an automotive application if I change the core plugs and swap everything over? I have new manifolds as well.? Thanks for any info.
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    Yamaha guages

    I have a 2002 Yamaha OS66 200hp. I Have just installed it and the tach unit. The tach has alarms but since I have a water pressure gauge and a temp gauge in the dash from my previous motor I figured no harm in hooking them up to the Yamaha. On my old mercury I could hook the temp gauge to the...
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    What Year is my ox66 200hp Yamaha?

    The last letter of the serial # on the motor bracket is scratched off. It starts with SX200TXR? Is there any other spot this # appears on the motor. I have narrowed it down to a range of years from 99 to 05 but that is as close as I can get. Were there any notable changes to this motor that...
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    25hp 4stroke merc won't hit top rpm

    This motor in new and I assum it is over pitched as the rpm are fine in netrul, but under load it will only hit 1/3 of the rpm it should. I checked the linkage and it is working correctly. Is there anything else I can check. The fuel pump is working fine and the fuel rail is clean, could it...
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    Mercury Starter Bendex

    How many teeth should there be on the starter bendex for a 1990 merc 135hp black max?
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    Merc carb adjustment

    I have a 1994 Mercury 135hp outboard. I have removed the carbs, soaked, cleaned and flushed them out. On all 3 carbs I have set the mixture screws to 1.5 turns out from lightly seated. Each carb has a 2 mixture needles (one on each side of the carb) I assume one is for idle and the other for...
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    Testing the water pump

    I have a 1990 Merc 135hp (On a 20ft Bayliner Trophy) I replaced the water pump but suspect it is not working correctly. I replaced the thermostats, popit valve and installed a water pressure gauge. At idle the water pressure gauge barely registers maybe 1 to 2 lbs it does go up when I increase...
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    Carb adjustment

    I have a 1956 Mercury 20hp (Mark 25 Model) It has good compression and new plug. I cleaned the carburetor and flushed the fuel lines. I can get it to run in the start position and it sounds good but when I turn the handle to the shift position as the rpm's drop it dies. I believe to to be the...
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    Water prussure guage

    I have a 1990 135hp Mercury Black max. I purchased a Faria water pressure gauge and can't find the location to thread into the block. I assume since it comes with a threaded insert there must be a plug on the block I can remove to install it but can't find it. Or do I need a different...
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