Zincs

[Megan]

I know my engine has zincs, (a Mercedes om 636) I know they need to be changed, probably long since, but I can't find them, can anyone give me some pointers on where to look?

[Dan316]

heat exchanger

[Dennis.G]

Like Dan said.
I don't have a Mercedes, but there is only a single zinc on my engine, and its on the raw water heat exchanger. It is a "pencil" zinc the screw into a brass plug that screws into the side of the heat exchanger. Look for a large brass bolt head that kind of looks like it would be a drain plug. May be the zinc will be totally gone, and only the brass plug is still there. Check the pencil zincs at the marine hardware as they are sold both with and without the brass plug, and you will know what to look for.
If engine is raw water cooled, then the above will make no sense.

[Megan]

Originally Posted by Dennis.G

Like Dan said.
I don't have a Mercedes, but there is only a single zinc on my engine, and its on the raw water heat exchanger. It is a "pencil" zinc the screw into a brass plug that screws into the side of the heat exchanger. Look for a large brass bolt head that kind of looks like it would be a drain plug. May be the zinc will be totally gone, and only the brass plug is still there. Check the pencil zincs at the marine hardware as they are sold both with and without the brass plug, and you will know what to look for.
If engine is raw water cooled, then the above will make no sense.

Thanks, I'm pretty sure I can identify the heat exchanger, cylindrical looking thing with hoses going in and out both ends, yes?