W40 4-108 Coolant Change

[jackjanos]

To do this, you have to flush out all of the old stuff.  But has anyone tried to do this?  The manual says there is a petcock or plug somewhere down in the lower engine block to let out all of the old coolant/water.  I have looked & looked, but can't find it.  I have looked on both my W40 and on a friend's Perkins 4-108 to no success.

The only drain outlet I know is at the heat exchanger,  but this will only drain the stuff at that level.

Does anyone have a picture of where the lower plug is?

The coolant is supposed to be changed after a few years, to make it fresh with the anticorrosive properties, among other things, just like you are supposed to do with your car.

Mine has NEVER been changed.

Jack

[RayNWanda]

 Nothing to it. Open the engine compartment under the companionway and put your left hand on the flywheel housing right next to the engine block ( This would be on the port side). Extend your first finger straight down alongside the block and you should find a 1/4" pipe plug. I found it by accident...