Mercruiser 496 Mag

[Sszler]

I have had an issue with the following fitting coming apart on the last trip out. http://www.perfprotech.com/mercruis...170?search=22-8M0050599&sortpartnbr=8M0050599 It is the Drain Fitting Assembly that fits below the exhaust manifold on each side. Replacing the part is cheap and easy but my concern is why did it come apart in the first place. I am thinking either it wasn't connected properly, or there was too much water pressure? Does anybody know if they are designed to come apart under pressure? If not I would like to 'mouse' the parts together to prevent it happening again., or am I on the wrong track?

 

[guyjg]

I can't see the bottom of the upper piece but it appears to be a twist locking type. It will continue to come apart if the parts turn to align the unlock position.