I've looked everywhere, but can't find any.

What is the rated output of the water pumps on our diesels? More specifically, the OM693.

I was messing around with the cooling system over the summer as well as yesterday and today, I've hooked up an aftermarket cooling system tester and the flow output ball doesn't even move.

I've disconnected the upper hose and looked at the output flow on the SDL at idle (and no thermostat), it is little more than a trickle. At about 2000 rpm, it's much better, but not much more than a gallon per minute in my estimation. It kind of pours out, in waves. I expected a pretty good steady flow.

I had compared this to my '85 SD, and it's no different. I have no cooling problems with the SD.

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)