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-   Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)
-   -   496 mag coolant change (https://www.offshoreonly.com/forums/do-yourself-boating-budget/272722-496-mag-coolant-change.html)

keith2500hd 06-10-2012 10:04 PM
just behind them to rear. about middle of block. normally behind oil cooler/filter lines(port) and dipstick tube(stbd).

Jvander 09-25-2019 07:45 AM
Originally Posted by Raylar (Post 3646210)
Below the motor mounts right down by the block pan rail. They are 18 mm heads for a socket or you can use an 8mm allen that they accept in the center of the plug head.

Best Regards,
Ray @ Raylar
Thanks for the help here Ray. I was able to find the SB side plug and drained out a little over 3 gallons. The port side is buried under tubes and wires and so I wasn't able to drain that side. 2003 engine 800 hours with original coolant and it looked really good yet and was good on the freeze test strip. I figured I was able to replace more than 60% of the coolant so maybe I'm good for a while.


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