engine operating temp... - Page 2 - PeachParts Mercedes-Benz Forum

jbaj007 · #16 08-20-2006, 12:57 AM

1985 edition of the TDM says thermostat should begin to open at 80ºC and be fully open at 94ºC for the 615,616 & 617 engines. (+/- 2º) FWIW

601,602 & 603 stats are 85ºC/94ºC.

lukas · #17 08-20-2006, 01:16 AM

http://www.peachparts.com/shopforum/showthread.php?t=161718&highlight=lukas

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 · #18 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 · #19 11-30-2006, 11:19 PM

sounds like it might be the guage!

tom w

unkl300d · #20 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 · #21 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?

#22 12-01-2006, 05:50 AM

Quote:

Originally Posted by Stevo

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?

It sounds like they are missing with the thermostat to support some kind of WVO hack. IMHO, just run the correct (80C) thermostat.

t walgamuth · #23 12-01-2006, 08:06 AM

i thought it sounded like the guage might be consistantly reading 20 to 30 high. kindof skimmed it though.

tom w

unkl300d · #24 12-01-2006, 11:12 AM

I jumped into this old thread because it had related topic.

My 300D is not WVO. The guage 'seemed' to be fine always. I have no way of knowing how exact and accurate it is, but it works.
The symptom always was that it took a long time to get up tooperating temp. With the 80*C stat, it usually ran at 175 F or a hair higher once it reached normalalized temp.
Of course on hot days, during long freeway drives, it would be higher like around 212F.

Now I have a 92C stat. The running temp is higher. Stabilizes at around 220F-230F . It reaches stabilized temp faster now than with the 80C stat.

So, what is normal op temp for a 300D nonturbo?

Is a 92C stat NOT recommended for this car??

Stevo · #25 12-01-2006, 11:32 AM

Quote:

Originally Posted by unkl300d

I jumped into this old thread because it had related topic.

The symptom always was that it took a long time to get up tooperating temp. With the 80*C stat, it usually ran at 175 F or a hair higher once it reached normalalized temp.
Of course on hot days, during long freeway drives, it would be higher like around 212F.

Now I have a 92C stat. The running temp is higher. Stabilizes at around 220F-230F . It reaches stabilized temp faster now than with the 80C stat.

So, what is normal op temp for a 300D nonturbo?

Is a 92C stat NOT recommended for this car??

All you needed (at most) was a new 80c T stat. A tad above 174F is just right. You need to look for a new mechanic

vstech · #26 12-01-2006, 11:44 AM

hmm. on the same car, well a TD actually,
how long should the temp take in 30-50 F outdoor temps to reach 175 F (80C?)?
John

Stevo · #27 12-01-2006, 11:49 AM

Quote:

Originally Posted by vstech

hmm. on the same car, well a TD actually,
how long should the temp take in 30-50 F outdoor temps to reach 175 F (80C?)?
John

Geez, I read some where just how long it should be, seems like it wasn't long, something like 5 minutes, not that long.

rrgrassi · #28 12-01-2006, 02:01 PM

All I could find was a 92c Tstat. No one had the 80c one. I will replace with an 80c one in the spring season. Currently runs about 95-98 on the highway.

justinperkins · #29 12-01-2006, 02:36 PM

Quote:

I will replace with an 80c one in the spring season.

Wouldn't you want to get the 80c tstat in there now so it doesn't take as long to warm up? I don't know about you, but I like my heater working as fast as possible when it's cold outside.

Quote:

No one had the 80c one.

Click the 'Buy Parts' link at the top of the page, they're right there.

Magoo · #30 12-01-2006, 03:28 PM

Mine runs at 100-105C (going by the OEM gauge) at idle and low speeds, and climbs to 110C at 65-70mph. I think that's a bit hot going by what i've been reading here, but have not confirmed accuracy of the gauge yet. I took the thermostat out yesterday to replace it and found it was 176F(80C)! However it's a made-in-China brand so I don't know if I trust it. Also I noticed the radiator has apparently contacted the fan at some point in the car's previous life, so there are some rather large flat areas. It has the 6 blade fan too...
Can anyone recommend an easy way to check the guage accuracy?