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Thread: water and oil under distributer cap

  1. #1
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    Default water and oil under distributer cap

    Was having problem with motor running properly, found out there was moisture and oil under distributer cap. cleaned it up and ran fine afterwards. whats causing the moisture? and is the oil coming up the shaft?

  2. #2
    Member Dupont Spinner's Avatar
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    Not too uncommon to see condensation under the cap. Most bilges are pretty high humidty as water has accumlated, then the engine runs for hours, evaporating the water causing a tropical enviroment in the engine compartment. Always worth pulling once in awhile to dry it out. Also if you can getting the lid up and letting things air out to help dry thing up a little.

    I am not sure on the oil. The only possible would be the shaft seal going bad and getting vapor from a hot engine.

    Assuming this is an inboard????

  3. #3

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    Try to move the distributor shaft laterally, that will tell you much. Most dist. do not have a shaft seal but instead have a bushing and helical groves in the shaft to direct oil back down toward the crankcase. If the bushing is worn then the oil will migrate up into the cap area.

    A usefull item to deal with moisture in areas such as the dist. cap is "brakeclean", it displaces and evaporates moisture extremely well, it also is a great solvent and will clean the oil off.

    Duponts' suggestion of airing out the engine compartment is a god one. If when you tow the boat and it is a dry day, a good way to get a good portion of that moisture out would be to leave the engine cover off/open, if it can be done safely and securely.

  4. #4

    Default Somethings leaking???

    The oil sensor is in that area, goes into the block, that isn't leaking is it??? Something is up, doesn't sound normal to have moisture and oil there. Put some liquid soap in the bilge with a little water then drive home, it will slosh around and clean the bilge under the engine, then shop vac it dry. Clean like they said with the brakeclean on the top areas, get a mirror, light, and inspect the livein' crap out of the area for a leak. Keep a dry bilge, the heat from a hot motor down in a box like that of a boat's engine hold should be baked dry, unless she's bleeding somewhere.

  5. #5
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    thanks for the imput. The moisture caused it to backfire and then the starter began making a loud noise. would a backfire cause this?? crazy boats. always something. My last boat I've been broken down on the porcupine two different times. I lost that battle, the river won, and not planning on going back there. Sure can be adventuresome those boats.

  6. #6

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    A backfire will not cause an issue with the starter, a properly working starter motor will be completely disengaged from the flywheel and be static. Sounds like coincidence . Are you hearing the odd starter noise while cranking or after the engine is running? Odd starter motor noises generally are a result of a failed/failing starter drive (the portion that extends outward and contacts the flywheel).

    Look closely at the starter for any loose fasteners holding the starter together or to the engine block. If all appears well there then likely you will need to replace the starter motor. Don't waste time trying to replace the solenoid or the starter drive, it is not worth the expense or effort.

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