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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I have a 2001 merc 5.7 why does the knock sensor have a tee

Customer Question

I have a 2001 merc 5.7 why does the knock sensor have a tee fitting and why would the side not occupied by the sensor be leaking all of the sudden can I plug it or eliminate it?
Submitted: 2 years ago.
Category: Boat
Expert:  Tan replied 2 years ago.
Hello. My name is***** tee is for the block drain plug and the knock sensor. The one side of the tee should have a plug to keep water in the block. Some of the engines use a blue plug. Can you post the engine serial number please?

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