Washing the Duramax engine

[btfarm]

Engine cold and best done in the shade. Preferably early AM or late afternoon.
Spray all areas with a pump type sprayer (spray bottle) of Simple Green full strength. Let it soak several minutes but don't let it dry. I usually do some misting after 5 minutes or so to keep it wet and allow it to soak longer. Hit it with your garden hose real well. Don't get too carried away around the electronics and connectors but they will withstand some abuse. DO NOT USE A PRESSURE WASHER! If you see a few spots you missed you can repeat those. Otherwise just wipe it down with a towel real well. Fire it up and let it get warm to dry it some more. There will be some water blown around by the fan you will want to dry off. Go for a drive and get a good heat cycle in it and park it with the hood closed to trap the heat in for complete drying. In my case I have such hard water at the yard hydrant that I'll leave tons of water spots on the exterior around the engine bay so the next step is a good wash job anyhow.

 

[BudTX]

I need to do the same thing with mine. It is overdue.

 

[RI Chevy Silveradoman]

Thanks Mike. I last did mine when it was warm. I'll do it cold next time. Actually my engine still looks pretty new. I have 63K. The most dirt came from when I took it back to the dealer for the new EGR motor and EGR Valve. THEY left the aluminum intake manifolds all full of black. Other than that, it is clean.

 

[btfarm]

Here's a couple of before shots:





And some after this morning:

 

[rtquig]

I find that when I wash the truck, I use a hose filter that you would use with an RV and although I still get some water spots, they are a lot less than when I wash the truck without it.