I think Marshall got the numbers confused. I just checked the OM602/603 factory manual, section 20-005. The chart there says that non-turbo 602 engine t-stats start opening at 85C, and are fully open by 100C. However the turbo 602 and 603 engine t-stats start opening at 80C, and are fully open at 94C. Either way is somewhat irrelevant, as both should be fully open by the time a pot of water is boiling, for test purposes.
:-) +dm > ------------------------------ > Date: Wed, 28 Dec 2005 13:57:45 -0500 > From: Marshall Booth <[EMAIL PROTECTED]> > Subject: Re: [MBZ] SOS - '87 190Dt Overheat! > > > Dave M. wrote: > > Hi Tan, > > > > > You can test the t-stat in a pot of hot water, it should visibly open > > fully by ~94?C, before the water is boiling. No pressure is needed to > > make the t-stat open. I'd pull the water pump and replace it. I > > suspect the impeller could be separated from the shaft - not likely, > > but I'm fresh out of other ideas. I'd get a rebuilt pump from the > > dealer (or OE from Rusty), that was the most economical option the > > last time I checked. Please keep us updated, I'm curious what the root > > cause is. > > > WRONG. The 603.96 & 602.96 thermostats start opening at 80 and are fully > open at 100 deg. C. > > Be SURE there's not a big air bubble (that will cause the exactly what > you seem to be describing). > > I have never had a bad 60x water pump. I've had 3 bad radiators. > > Marshall
