I not sure if there is a problem indeed as you suggest - I'm juust enquiring if its normal. The temperature reachs 98 deg on a mild hill with no load at 25 deg C. Temperatures can reach 35-40 deg C here and should I be towing a loaded trailer I am a bit concerned. Furthur when I had the engine overalled ( 2 years ago ) the engineering company suggested that the engine is running too hot ( by viewing th ecyl head )
Peter Merle -----Original Message----- From: Marshall Booth [mailto:[EMAIL PROTECTED] Sent: 26 June 2006 09:58 PM To: Mercedes Discussion List Subject: Re: [MBZ] 79 300D Normal Coolant Temperature Peter Merle wrote: > > -----Original Message----- > From: Desert Rat [mailto:[EMAIL PROTECTED] > Sent: 23 June 2006 01:02 AM > To: Mercedes Discussion List > Subject: Re: [MBZ] 79 300D Normal Coolant Temperature > > > Peter, those are great numbers.....wish my MB's were that low! > > I wouldn't touch a thing. > What doi you mean that Low - is yours running hotter! > > I am a bit puzzled - I have the same engined Gwagon ( W460 series ) > and that termperature stays less than 90 regardless of conditions - > uses same thermostat but does have a slightly larger radiator - > vehicle weight is however also signifcantly higher. Its radiator is > copper , the W123 of mine is aluminuim /plastic . My radiator has been > cleanened professionally . I do have a copper raditor new - however it > is not a simple plug and play replacement - the brackets are offset > and there are no brackets for the oil cooler so it will need > modification . This raditor was made for OEM for the South African > W123 's and somehow the mounting is different!! Peter Merle > capetown I still haven't heard that you have ANY problem. The principle objective of the cooling system design is to allow the coolant to run as hot as possible - WITHOUT boiling. If you have a problem with the coolant boiling, then you need to do whatever is required to prevent that! If the coolant is NOT boiling away, then the engine will run as efficiently as possible and fuel consumption and engine wear will be optimized. The purpose of the cooling system is to PREVENT cooling until the temp reaches about 85 degrees and to slowly divert more and more coolant thru the radiator as temperature increases until it's all diverted at between 94-102 deg. C. Only when/after all of the coolant is diverted thru the radiator does the fan(s) become energized to add to the cooling. Using 1-1.4 bar of radiator pressure further raises the boiling point of coolant and the use of a surfactant (such as Red Line Water Wetter) can further improve the transfer of engine heat from the engine to the coolant and from the coolant to the radiator surfaces. Engine heat readings of as high as 115 deg C are entirely proper under sever conditions as will harm NOTHING as long as the system is operating as designed. The design of the 123 cooling system was entirely sufficient for even desert environments as long as the system was properly maintained! It MAY not transfer as much heat as fast as your W460, but why should it? There is NOTHING magic about 90 deg! It's only important to prevent coolant from boiling! Marshall -- Marshall Booth (who doesn't respond to unsigned questions) "der Dieseling Doktor" [EMAIL PROTECTED] '87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84 190D 2.2 229Kmi (retired) _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
