engine operating temp... - PeachParts Mercedes-Benz Forum

rebreath · #1 08-18-2006, 10:36 PM

recently returned from a trip to maine in the benz.Those of you that have looked and helped with some of my other dilemmas will remember that turbo function was an issue.after cleaning and gauging(boost) I narrowed it to boost pressure sensor and/or alda.boost sensor seemed to be the one,but I digress.after leaving from pittsburgh and driving for several hours I noticed that my engine temp was staying at about 82C.at one point when climbing a particularly long and steep hill,temp went to about 92C.recalled reading about adding fuel enrichment(alda) when turbo boost is high(@70mph pushing a steady 6# boost,when @80 pushing a steady 13# boost(installed hybrid boost mechanism-bearing with spring ) .anyway,after the alda adj my temp went back down to about 78C and stayed there no matter how big the hill or how long boost is "maxed"(14+ish#).drove all day several days in a row.car seems to run strong and with no dilemmas.what is the normal temp range for my 300D turbo.read a post about smeone changing their thermostat to a hotter one because they felt that their wvo was not getting enough heat.they were talking about temps in the low 90'sC.is my car running cold?does this mean/imply some problem that just has not surfaced yet!?
My a/c is non working,would this keep temps low?the car was loaded, girlfriend,dog and all associated camping gear for a week in the back country of maine.thank you for any and all assistance.
BTW-have not fixed center vent yet....

sailor15015 · #2 08-18-2006, 10:42 PM

Is this a 617, 603...? My 617 stays between 82-90 degrees almost all the time. Sometimes it'll get up to 95 on a big climb with the a/c on when its 100 degrees F + outside. Not sure how the 603's run.

rebreath · #3 08-18-2006, 10:47 PM

Quote:

Originally Posted by sailor15015

Is this a 617, 603...? My 617 stays between 82-90 degrees almost all the time. Sometimes it'll get up to 95 on a big climb with the a/c on when its 100 degrees F + outside. Not sure how the 603's run.

I beleive it is a 617.

rebreath · #4 08-19-2006, 04:50 PM

Quote:

Originally Posted by rebreath

recently returned from a trip to maine in the benz.Those of you that have looked and helped with some of my other dilemmas will remember that turbo function was an issue.after cleaning and gauging(boost) I narrowed it to boost pressure sensor and/or alda.boost sensor seemed to be the one,but I digress.after leaving from pittsburgh and driving for several hours I noticed that my engine temp was staying at about 82C.at one point when climbing a particularly long and steep hill,temp went to about 92C.recalled reading about adding fuel enrichment(alda) when turbo boost is high(@70mph pushing a steady 6# boost,when @80 pushing a steady 13# boost(installed hybrid boost mechanism-bearing with spring ) .anyway,after the alda adj my temp went back down to about 78C and stayed there no matter how big the hill or how long boost is "maxed"(14+ish#).drove all day several days in a row.car seems to run strong and with no dilemmas.what is the normal temp range for my 300D turbo.read a post about smeone changing their thermostat to a hotter one because they felt that their wvo was not getting enough heat.they were talking about temps in the low 90'sC.is my car running cold?does this mean/imply some problem that just has not surfaced yet!?
My a/c is non working,would this keep temps low?the car was loaded, girlfriend,dog and all associated camping gear for a week in the back country of maine.thank you for any and all assistance.
BTW-have not fixed center vent yet....

and 56 people looked at THIS one and again-no suggestions.I am shocked considering the level of logaria that normally is on this website!!!!

iNeon · #5 08-19-2006, 06:30 PM

Quote:

Originally Posted by rebreath

and 56 people looked at THIS one and again-no suggestions.I am shocked considering the level of logaria that normally is on this website!!!!

Sometimes we read threads to learn what causes problems.

You know, when we don't know what causes them...

Brian Carlton · #6 08-19-2006, 07:08 PM

Most of the 617's run close to 90°C. in steady state conditions on the highway. Going uphill will cause a rise in temp........sometimes approaching 100°C..........and climbing an extended steep grade at maximum power in 95°F. ambient temperatures or more will cause the temp to climb above 100°C.

Naturally, there are numerous variables which will affect the above statement. Some folks run hotter than the above, but, usually there is an issue with the cooling system such as an inadequate radiator.

It's unlikely that you are running a consistent 82°C. simply because the thermostat does not begin to open until 80°C. and the difference of 2 degrees is insufficient to generate sufficient flow around the thermostat to the radiator. You most likely have a gauge that reads several degrees cooler than the operating temperature of the engine.

Consider the temperature normal and further investigation of the cooling system to increase this temperature is unwarranted.

#7 08-19-2006, 07:21 PM

75-82 is a normal running range. But, it should only go higher during long hills, stop-and-go traffic, and hot day's with A/C on high.

When it gets above 100*, it's time to back off, kill the A/C and let it cool down. If you let it go all the way to 120*, you are asking for trouble.

I'd recommend that everyone upgrade to the 9-blade plastic fan and smaller waterpump pulley. They can be bought new at the dealer or found on most late 83+ 300xD's.

I don't have A/C, but I have to work it pretty hard to break the 90* mark.

Brian Carlton · #8 08-19-2006, 07:34 PM

Quote:

Originally Posted by ForcedInduction

75-82 is a normal running range.

It's difficult to support that argument if the range of the thermostat is 80° to 94° and the location of the sending unit usually dictates a slightly higher number than the location of the thermostat.

Stevo · #9 08-19-2006, 07:27 PM

Quote:

Originally Posted by Brian Carlton

Most of the 617's run close to 90°C. in steady state conditions on the highway. Going uphill will cause a rise in temp........sometimes approaching 100°C..........and climbing an extended steep grade at maximum power in 95°F. ambient temperatures or more will cause the temp to climb above 100°C.

This is just how my 240Ds run. Sounds normal to me

lukas · #10 08-20-2006, 01:16 AM

Hotter Thermostat for WVO?

Howdy,
I put a hotter 92 degree thermo in my 83' 300d with good results. I have been running it this way for a few days now, through a whole tank of wvo, and am pleased with the results. I think it will be especially helpfull this winter. My wvo system is totally dependent on coolant heat for proper operation.
Cheers!
Lukas

unkl300d · #11 11-30-2006, 10:01 PM

Yesterday my mechanic replaced my Behr 80 *C thermostat with a German made (Wahler?) 92*C thermostat.

He noticed that the engine of my 1979 300D was taking too long to get to higher temps (usually ran at 175 *F or a bit above that but did take a while to climb to temp esp. in winter -no snow etc.).

So now the car runs at what seems to be 230*F (110*C).

I am not sure how to read the marks on my Farenheit temp gauge.
The labeled lines are 100, then 175, then a mark unlabeled, then the white mark for 250 having the red zone just above that.
My car seems to be normally running between the unmarked one and just below 250. I calculate to be 110*C.

I am sure this is better for the engine than the way it was before because I am attaining running temp faster. Especially for City driving.

Is it all good?? Comments??

Thanks

t walgamuth · #12 11-30-2006, 11:19 PM

sounds like it might be the guage!

tom w

unkl300d · #13 11-30-2006, 11:58 PM

You mean the guage being innacurate by +- 5 degrees??

The guage has behaved fine historically but the accuracy I can not vouch for.
Just what the before and after readings were. I personally don't think the guage is bad. Perhaps a bit innacurate..

The main question is, are these supposed readings OK for this engine? i.e. using a 92*C v.s. 80*C thermostat?

Stevo · #14 12-01-2006, 12:13 AM

Sounds like your car was running at normal operating temps with the proper t stat before your mechanic messed with it, or am I missing something?