The block drain plug is a 17MM hex plug directly behind the exhaust down pipe , it's a stinker to remove but yes , I suggest removing it when you flush .
Be aware there's a thin crush washer it needs , this washer likes to go ! POING ! and disappear into the 12th universe , never to be seen again .
-Nate
Chuck wrote:
>
> I found a source locally for the citric acid powder, at a beer and wine brewing supply house.
> I also found out there is a drain plug for the engine. Do I need to remove that, and drain the bottom of the engine of fluid? I would assume to flush through the upper radiator hose to clean that part of the engine?
>
> Thanks,
>
> Chuck
> 84 300sd
>
>
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