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Old 12-07-2012, 11:49 AM
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CC2MC CC2MC is offline
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Join Date: Aug 2012
Boat: 2003 Maristar 210 Predator
Location: Alabama
Posts: 1,117
I believe he is correct is saying it is a temp sensor as it is right along side the spark plugs. Unplug the knock sensor first then either a 7/16" or 7/8" socket should fit right on it, provided it is the same as my boat. The manifold should have a plug on each end, which in your boat should be forward, if I am not mistaken. It looks like there may be an L connector with a hose coming out of it. See if that hose is connected to another hose from the other manifold. If so, you should be able to unscrew them in the middle and drain the manifold into the bilge. My boat is a direct drive so the engine is turned the opposite way.
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