Anyone here work on tier 3 diesels...?

[Bartman39]

Kinda curious if anyone else on here works on them besides me...? We have been having all kinds of issues with our Cummins tier 3 diesels and injectors... Here lately we have diagnosed and replaced set after set and now we no long can get new injectors and are having to replace them with reman`s which dont last for crap... Also not sure why they dont last any longer than 200-300 hours most of the time (might get 500-600 but not often) the reman`s that is...? I think the stock of new injectors is getting kinda in short supply or they cant afford to keep sending new ones for warranty...?

Well tell our customers time and time again to drain the water off the tank and the primary fuel filter every and I mean every morning but of course they dont do it... I`m not fully convinced that is the problem anyhow...?
Also the topic came up today as to whats going to happen when tier 4 comes into play and its gets worse...? I just dont understand why they have to strangle off road equipment with this crap...? Anyhow anyone else have any insight...?

 

[Bartman39]

Guess not...?

 

[Vette73]

Not a diesal tech but did work on them for a little time.

Most remans are just new outside seals and then a power flush. So the insides are the same just power cleaned. The reason they gunk up so fast, reman, is the flush will not fix a design issue and will only clean/reset so much.
See if you can find somebody that has a bench F/I machine to flush them. May save some time/money if its not covered by warranty. But will not fix the major problem which sounds like a design issue based on how it is used.

Same issue with the old mech F/I on European cars. Had a SL mercedes in shop and it kept clogging the injectors as the person did not drive often and even then was mostly short drives. I at first cleaned the injectors on a machine but that only lasted so long. Found out after just taking it to the highway and flogging it did about the same.
Kinda like above. They were designed to be driven not sit and short drives. So just had the guy drive it more often and get on it a little bit more.

 

[LTC8K6]

http://www.casepower.com/serv_tips_tier3.html

I have also read not to add any aftermarket fuel conditioners.

 

[Bartman39]

Thanks for the replies...:thumbsup:

It seems we are now checking the fuel tank alot more often also and finding crap in them... You would think with a 10 micron primary filter and a 2 micron secondary things would be ok other than plugging one of them up...? But according to what Cummins is telling us the water that gets saturated into the fuel is whats causing the problem not trash... Guess we need to invent a filter that would remove all the water out of contaminated fuel but be like a simple spin on filter...? May end up having to do something like we use in a bio-diesel production system which is a centrifuge for seperating left over water and contaminates...? Possible idea...?