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Old 03-24-2013, 03:41 PM
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Engine running cool?

Hey guys,

Just wanted to post this to hopefully help others out. I noticed that my coolant temp (on cluster) was just above C (first line) constantly, even if I was running for an hour. For some reason I didn't think this was right. After further investigation I found a page explaining the importance for a diesel to maintain a decent temp in the engine, especially ours seeings as the injectors use the high pressure oil (and electric) to fire them. If this was the case then "cold" oil wouldn't make the injectors fire as efficiently, makes sense right!?.

I came to the conclusion that I was going to spend the $18 for a new Tstat. When I removed the one installed, I found that it was made in Germany and had a few rubber seals on it that were in very poor condition. Swapping it out with a US brand for no more than an hours work at very little cost.

Now my coolant temp gauge is constantly around the "R" of the "normal" in the range. I can also safely say that my engine hasn't ever felt this good since I bought the thing! I feel as if I am getting more power and more mpg.

I hope this thread helps others out, I'm not a mechanic by any means but with a little help and looking on other sites/pages it brought me to these conclusions.

Here is my other post.

Coolant gauge indication

My coolant gauge before.



Coolant gauge now.



Sorry for sideways photo! LOL
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Old 03-24-2013, 03:47 PM
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It's also the fact that with a warm motor, you get a more complete combustion of all your diesel.
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Old 03-24-2013, 04:00 PM
Can you hear the derail??

 

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Mine looks like the second pik when I'm loaded, but unloaded it takes forever to get up to the o in normal
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Old 03-24-2013, 06:28 PM
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Quote:
Originally Posted by jesilvas View Post
It's also the fact that with a warm motor, you get a more complete combustion of all your diesel.
Good call Jesilvas!

Quote:
Originally Posted by 351fifty View Post
Mine looks like the second pik when I'm loaded, but unloaded it takes forever to get up to the o in normal
I went camping the last summer with a loaded truck, not knowing my tstat was screwed (stuck open), just thought the cool air was keeping the temp down and mine was the same as what you are saying. however, going up one of the many mountain passes here my temp gauge climbed to the "M" of normal.

So similar "problem" as yours, you might be worth looking at spending that $20 and 1 hr work to swap it out?
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Old 03-24-2013, 06:37 PM
Can you hear the derail??

 

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Possibly, but I get 20 hwy on summer fuel and 16 on winter, so i don't wanna tempt fate and end up worse lol
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Old 03-25-2013, 06:48 AM
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Yeah I'm having the same problem. My gauge only gets to the N on normal. And it fluctuates below and a little above the N. could my thermo stat be open? When I got the truck about 3 months Ago the guy had just replaced it
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