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Old 05-07-2007, 04:39 PM   #1
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Default Water drain plug thread size

´Hello , do anybody know the thread size/type for the water drain plugs on a 2001 Mercruiser 7,4 MPI,I would like freshing up the treads before I put in new drain plugs.
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Old 05-07-2007, 05:17 PM   #2
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finn..which drain plugs are you wondering about??..the blue plastic ones???
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Old 05-07-2007, 05:26 PM   #3
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yes , the blue plastic plugs
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Old 05-07-2007, 07:03 PM   #4
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ok...not sure what size they are ...but there shouldn't be a need to chase them out of the fittings....unless they have been damaged somehow...I'll check sometime today with maxum and see what they have to say.....
I think you just need to hold your tongue just right and pray to the boating gods....haha...just kidding...I'll get back to you on this....
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Old 05-08-2007, 07:19 AM   #5
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some of them have leaked and there is rust in the threads so I need to do something
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Old 05-08-2007, 02:05 PM   #6
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check the rubber oring...if they are missing..then get some new orings...they come in all kinds of sizes so going to a slightly thicker one might help......
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Old 05-08-2007, 02:11 PM   #7
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okay , but I still need to do the threads, I can´t screw in the new plugs without spoiling the threads on the plastic plug :-)
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Old 05-20-2007, 08:46 AM   #8
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The thread i 1/2 inch witworth , if somebody should need it :-)
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Old 05-20-2007, 03:28 PM   #9
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oh man Finn... I forgot to go after that info for you!!...been really busy at work and all and just flat out forgot!!...sorry.... :shock:

thanks for posting the info on the web here....
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