Re: [MBZ] OM617 run-hot symptoms (another question)
P. D. Ferguson wrote: You would be better to modify a thermostat to stay in the full open position, and will find it useful when you do your coolant flushes. I did this with an old stat just to use for flushing the system with cold water by substituting a length of a nail for the brass pin--closes off the bypass and opens flow to the radiator. Since I store the car in the winter, I am wondering if I could leave the modified stat(maybe come up with a better way of modifying it) in year round. Any harm to running at lower temps and longer warm ups? More pollution? Fuel consumption and engine wear will skyrocket! When used just for short hops, fuel consumption in cold weather may ALMOST double. The purpose of the thermostat is to PREVENT cooling until the engine reaches the lower end of the optimal coolant temperature to minimize high wear and high fuel consumption that results when the engine is cooler than optimal. Until the engine reaches proper temp range, the fuel is not completely consumed. 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] OM617 run-hot symptoms (another question)
On Sun, 9 Jul 2006, Steve MacSween wrote: HOWEVER, I did today decide to pull the thermostat (3 mos. old) and see what difference it might make. Umm the thermostate deisgn in the mercedes engine is a little unique-- there are two plates, one opens as the t-stat warms and the other closes... the opening plate allows coolant to the radiator while the closing plate blocks the bypass. Removing the t-stat allows water to flow through both. You would be better to modify a thermostat to stay in the full open position, and will find it useful when you do your coolant flushes. -j.
Re: [MBZ] OM617 run-hot symptoms (another question)
You would be better to modify a thermostat to stay in the full open position, and will find it useful when you do your coolant flushes. I did this with an old stat just to use for flushing the system with cold water by substituting a length of a nail for the brass pin--closes off the bypass and opens flow to the radiator. Since I store the car in the winter, I am wondering if I could leave the modified stat(maybe come up with a better way of modifying it) in year round. Any harm to running at lower temps and longer warm ups? More pollution? Peter Ferguson 1983 300TD
Re: [MBZ] OM617 run-hot symptoms (another question)
Lower temps are bad as they increase fuel consumption and promote the forming of carbon deposits in the combustion chamber. This will also make the engine much more sluggish! In fact, I can't think of any reason to NOT want the engine to run as designed! Jeff Zedic Toronto 87 300TD
Re: [MBZ] OM617 run-hot symptoms (another question)
Just a guess, but Q1 - your 'new' t-stat is bad, or there is corrosion in the housing. Q2 - you need the thickness of the t-stat for the o-ring to seal properly. On 7/9/06, Steve MacSween [EMAIL PROTECTED] wrote: I never did get around to doing the citric acid flush on my SD, seeing as how as soon as my sore back got better I made it even worse than before, putting up cabinets in my kitchen. HOWEVER, I did today decide to pull the thermostat (3 mos. old) and see what difference it might make. HUGE difference, went from running at ~100 to actually running a little under normal, just over 80, only hits 85-90 on the highway (70 mph). QUESTION 1: what have I learned here? Anything? QUESTION 2: I now have a slight leak at the mating surfaces of the T-stat housing. Will this just be a case of pulling it apart again and cleaning it up with sandpaper? TKS -- OK Don, KD5NRO Norman, OK The Americans will always do the right thing... after they've exhausted all the alternatives. Sir Winston Churchill '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager
