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  1. M

    Omc 3.0 not getting into high rmps in gear in water

    Hello. I have recently developed a problem with my 1986 OMC 3.0 engine. Engine works fine while testing in the driveway, even when I put it in gear it still gets to the high RPMS but when I put the boat in the water the engine will not get into high RPMS when I put it in gear. The engine...
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    86 OMC 3.0 Carb Questions.

    I have a 1987 Thundercraft with a 3.0 OMC 140 HP engine. I am trying to troubleshoot the carburetor problems. The boat has starting problems I have to crank for quite a while to have it started. In order to start I have also to adjust the screw so the engine get some RPMS and warms up. Then...
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    Omc 400 stringer 3.0 140 HP overheating problems

    I have a 1987 Thundercraft with OMC 3.0 140 HP and 400 stringer out drive. The engine is running very hot. I have replaced the temp sensor, cleaned the exhaust manifold and riser. Is there anything else besides the impeller that could cause the engine to overheat. I have replaced the engine...
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    Omc 3.0 140 hp

    I have a 1985 ThunderCraft 3.0 140 HP OMC with a cracked block. Can anyone tell me if I can replace it with a 1976 3.0 OMC? I know that there is a slight gear ratio difference. Can it be corrected with replacing the fly wheel and coupler with the old parts from the bad engine I am replacing?
  5. M

    1985 omc 3.0 140hp issues

    I need some advice. I have bought this 17' 1985 Thundercraft with 3.0 OMC 140 HP engine with some issues. The engine starts and boat gets going nicely but when I stop and turn off the engine I have problems starting it again. What seems to help is to lift off the engine cover. Once the...
  6. M

    Chrysler 45 HP CHARGING/RECTIFIER ISSUES

    I have a 78 or 79 45 HP 2 stroke/2 cylinder outboard engine and I think I am having charging issues with. When I disconnect the battery when engine is idling it dies. Is is supposed to do that? I've also noticed that when I cruise for a while on a full throttle the charging indicator goes...
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