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| Blue Butterfly nut https://www.smwebhead.com/phpBB3/viewtopic.php?f=3&t=612 |
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| Author: | C4 [ Sun Feb 25, 2007 12:53 am ] |
| Post subject: | Blue Butterfly nut |
2006 Horizon 200, Mercruiser 4.3 MPI engine. On the engine, just next to the blue H2O drain screw is a blue butterfly screw (looking aft, it is about 2 inches left of the blue H2O drain screw). Is this for flushing the engine?? I do not have the engine owners manual... |
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