Regen

[Rawze]

(07-02-2017 )Hendog83 Wrote:  Hey guys I had a force regen done today and the tech told me my egr valve is closing at 22% at regen and it should be 0% so that's not letting the exhaust gas get to 700 which was getting to 580. My doc temp was (585), dpf temp (1039) oulet temp (1029) is that correct or something wrong the egr valve is a year old and was taken off few months ago and clean and inspected. I was told since the exhaust gas isn't getting hot enough it keeps doing frequent regens.

On a very healthy CM871 enigne (I own one), the expected exhaust temp should be 560-600 degrees during a regen cycle. The DPF inlet temp should be roughly 1,000 degrees or so and the outlet temp about the same, but usually slightly higher after the DPF has gotten cleaned. The timespan should take 40 minutes. Here is a reference video of a healthy system...





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So when I read your post and what you say that mechanic has said to you ---

WHAT AN IDIOT!!!--- DON'T LET HIM TOUCH YOUR TRUCK AGAIN AND HE NEEDS TO GO BACK TO TRAINING!!!!!

i.e. --- IF IT IS REGENING TOO OFTEN, THEN IT IS NOT LIKELY THE EGR VALVE. TELL HIM TO SHOVE THAT THEORY OF NOT RUNNING 700 DEGREES RIGHT UP HIS ARSSE! -- In fact, if mine were to get to 700 degrees instead of the EXPECTED 580~600ish at the DOC inlet, I would be seriously concerned.