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    thunderbolt iv question

    i've got a 4.3L v-6, not sure the year but it is a thunderbolt iv when i first started it up this year it was acting up. i would put it in gear and try to accelerate slowly and it would pop stuff out the carb. once i got a little further with the throttle it acted ok. I took the cap off the...
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    stalls after half hour

    I got a crusader 270 model. After about a half an hour of driving it will stall. When it stalls it surges and then is hard to start, i have to pump the throttle. I already changed the fuel pump, the filter in the carb, and the remote filter, there is also another filter on the engine i...
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    elec. fuel pump question

    i have a 5.0L Carbed. Ser. number OM674607 2003 thunderbolt V My fuel pump doesn't turn on when i turn on the ignition. I checked the wire at the fuel pump (purple/yellow) and there is no power. I traced it to the elec. choke where there is also no power. I then traced it to a sensor that...
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    strange problem

    My Yamaha 1991 55hp is doing something odd. I can go full throttle for a little while than suddenly it will bog down to about half throttle and i can't get it to go up to that rpm again. When it bogs it bogs down fast too, its not slow it is instant. My first thought is that it was fuel, i...
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    Trany cooling question

    I have a 350mpi inboard Merc. my tranny cooler just went, is it important to have the cooler on there, does the tranny oil get that hot? 2nd question: what can i do about the salt water that got into the tranny?
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    quick riser question

    salt water cooled merc 454. replacing risers and mine come with a different kind of gasket, two of the holes are very small on the new one. Is this ok, should i try and find a couple like the old ones with the bigger holes? also if this is normal what is the reason for making the holes smaller?
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    intake manifold gasket question

    some of these intake manifold gaskets you should put sealant on the water passages and some you aren't supposed to. how do you know which one you should put it on?
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    buzzing

    i've got two stations on my boat, an upper and lower. twin mercs too. when i start my engine on either station the port buzzer sounds and doesn't shut off as if the key is on but the engine isn't running. if i disconect everything going to the upper station i can start it from down below and...
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    idle rpm for merc 150

    i have a merc 150hp black max, 1984 6 cyl. I want to lower the rpms, is there anyway of doing that without having to re-sync the whole engine?
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    anti freeze in cylinders

    My friend has twin mercs, v8 fresh water cooled. not sure the year or anything i'll have to ask him. He just replaced his risers and when he turns over the engine lots of antifreeze comes out of the cylinders. He replaced three out of the 4 this year and the other one he did the year before...
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    temperature question

    i've got a MCM 4.3L 262 CID 6cyl. 2004 engine. My temp gauge has marks of 170 then the next one is 220. The temperature goes between the two and closer to the 220 side. should i be worried, for all i know it reading 190 or 210. Also the risers don't get too hot where as the manifolds get hot.
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    what plugs to use

    I've got two different books telling me two different types of plugs for my engine. Its a ford omc v-8 5.0L HO 1995 2bbl holley carb. One book tells me champion rv8c the other tells me champion rv15yc-4
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    valve adjustment

    i have a ford 5.0 1995 V8. i am putting the head back on and am wondering about the valve adjustment. do these only get torqued and not adjusted and if so what is the torque on these things.
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    can't torque head bolts

    ford omc 5.0L two of the bolts can't torque down because the threads in the block are stripped. They were rotted away because they go right into a water passage (salt water engine). Tried to tap to the next size larger thread but the bolt wouldn't get near the correct torque. can't heli-coil...
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    stalls after 3 seconds

    Here is the whole story I took the engine out of the boat to change the manifolds and risers, which i did and everything went easily. I started the engine in the shop to make sure there were no leaks or anything and it ran fine. I put the engine back in the boat and it ran for about 3-4...
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    One cylinder with no power

    i have a 5.0 v8 volvo and the 8th cylinder is not firing. It has spark but when i pull the lead out the engine doesn't react at all where as when i pull out all the other plugs for each cylinder the engine gets week. what would cause that one cylinder to do nothing
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    bearing carrier kicking my butt

    i am working on a yamaha lower unit, trying to reseal it and the bearing carrier is not coming out. I started out by bending the little tab in that prevents the bearing carrier nut from moving. THen the retainer nut needed to be drilled and split to get it off which was no problem. After that...
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