Re: [MBZ] 79 300D Normal Coolant Temperature
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
Re: [MBZ] 79 300D Normal Coolant Temperature
-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
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)
Re: [MBZ] 79 300D Normal Coolant Temperature
Hi Do try another descaling flush ,my 300se made a dramatic decrease in temp only after the third descaling flushing . Changing the cut-in temperature of the viscous fan coupling will effect a big change if all is well with the head gasket and other items. Lower hose pipe cavitations is a very often overlooked ,replace pipes if soft. I had a slight oily scum in the header tank then, which went away after the decaling flushing . Also added a bottle of bar's leak to the coolant . At one time my Jaguar XJ12 used to have this as a factory added sealant and was very effective in fixing the odd leaks the then jags always sprung up hence the factory recommendation for Bar.s Leak. mak - Original Message - From: Peter Merle [EMAIL PROTECTED] To: Mercedes Discussion List mercedes@okiebenz.com Sent: Thursday, June 22, 2006 4:25 PM Subject: [MBZ] 79 300D Normal Coolant Temperature I still ( after 5 years ) am not sure if I have a cooling problem with my 300D. Temperatures climb to 98degC when climbing a 200m hill that is 3 km is length ( average inclination 15:1 ) Normal temperature is some 82 deg. Fast ( 120km/h ) driving also results in higher temperatures ( 95 deg ). Ambient temperature 25degC. Is this normal or should I change radiator - ( I have changed pump, thermostat, fan-coupler ) Peter ___ 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.2/372 - Release Date: 6/21/2006
Re: [MBZ] 79 300D Normal Coolant Temperature
Why are we trying to fix something that isn't broken? Peter's operating temps are well within the specs. On 6/22/06, M.Afzaal.Khan [EMAIL PROTECTED] wrote: Hi Do try another descaling flush ,my 300se made a dramatic decrease in temp only after the third descaling flushing . Changing the cut-in temperature of the viscous fan coupling will effect a big change if all is well with the head gasket and other items. Lower hose pipe cavitations is a very often overlooked ,replace pipes if soft. I had a slight oily scum in the header tank then, which went away after the decaling flushing . Also added a bottle of bar's leak to the coolant . At one time my Jaguar XJ12 used to have this as a factory added sealant and was very effective in fixing the odd leaks the then jags always sprung up hence the factory recommendation for Bar.s Leak. mak - Original Message - From: Peter Merle [EMAIL PROTECTED] To: Mercedes Discussion List mercedes@okiebenz.com Sent: Thursday, June 22, 2006 4:25 PM Subject: [MBZ] 79 300D Normal Coolant Temperature I still ( after 5 years ) am not sure if I have a cooling problem with my 300D. Temperatures climb to 98degC when climbing a 200m hill that is 3 km is length ( average inclination 15:1 ) Normal temperature is some 82 deg. Fast ( 120km/h ) driving also results in higher temperatures ( 95 deg ). Ambient temperature 25degC. Is this normal or should I change radiator - ( I have changed pump, thermostat, fan-coupler ) Peter ___ 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.2/372 - Release Date: 6/21/2006 ___ 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 -- John Freer Palm Springs, CA 1992 500 SEL 143K Stardust 1985 380SL 143K Blue Belle 1996 Sidekick 57K Kermit 1992 500SL 108K unnamed
Re: [MBZ] 79 300D Normal Coolant Temperature
Curt Raymond wrote: The previous owner of my 300TD had put bars leaks in as a way to attempt to not replace the radiator. It took me a LONG time and many many gallons of water to flush all that out and make it not sieze up the thermostat. Went through 2 or 3 thermostats too... I'd used bars leaks one time in my old S15 Jimmy for the same reason and had pretty much the same result except that the attendant overheating didn't ruin the headgasket. It also does an excellent job plugging heater cores.
Re: [MBZ] 79 300D Normal Coolant Temperature
David Brodbeck wrote: Curt Raymond wrote: The previous owner of my 300TD had put bars leaks in as a way to attempt to not replace the radiator. It took me a LONG time and many many gallons of water to flush all that out and make it not sieze up the thermostat. Went through 2 or 3 thermostats too... I'd used bars leaks one time in my old S15 Jimmy for the same reason and had pretty much the same result except that the attendant overheating didn't ruin the headgasket. It also does an excellent job plugging heater cores. And it plugs monovalves WONDERFULLY. 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)
Re: [MBZ] 79 300D Normal Coolant Temperature
I still ( after 5 years ) am not sure if I have a cooling problem with my 300D. Temperatures climb to 98degC when climbing a 200m hill that is 3 km is length ( average inclination 15:1 ) Normal temperature is some 82 deg. Fast ( 120km/h ) driving also results in higher temperatures ( 95 deg ). Ambient temperature 25degC. Is this normal or should I change radiator - ( I have changed pump, thermostat, fan-coupler ) They do climb a bit, fairly quickly when load is applied. But if it worries you try a $5 acid flush first. If it makes a difference then maybe it was the radiator. OTOH, if it makes a difference maybe you don't have a problem anymore. It eliminated the overheating problem our SDL had. (Which got a lot hotter than yours did.) See: http://cathey.dogear.com/SDLcool.html#acid -- Jim
Re: [MBZ] 79 300D Normal Coolant Temperature
I would suggest checking the rad. 79 probably has the plastic/aluminum one, you can replace with same or get a brass/copper one (my choice, as they can be cleaned and don't corrode as aluminum does). I only see a temp rise that high while pulling long (15 - 20 mile) 4% grades in the mountains in the summer with the AC on -- otherwise it stays right above 85C. Peter
Re: [MBZ] 79 300D Normal Coolant Temperature
Peter Merle wrote: I still ( after 5 years ) am not sure if I have a cooling problem with my 300D. Temperatures climb to 98degC when climbing a 200m hill that is 3 km is length ( average inclination 15:1 ) Normal temperature is some 82 deg. Fast ( 120km/h ) driving also results in higher temperatures ( 95 deg ). Ambient temperature 25degC. Is this normal or should I change radiator - ( I have changed pump, thermostat, fan-coupler ) Sounds perfectly normal. 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)
