Have an 03 5.9 with 240k and I have diesel in the oil. What is the most likely problem? Injectors? How can I check if it is the injectors or pump? Truck seems like it should have more power.

Thanks

 

If you're getting fuel in your oil you more than likely have an injector (s) leaking. Any hard starts or smoke upon startup? Not sure if a loose cross over tube would let fuel into the crankcase or not but it's worth a check.

 

1st. Do not run until you fix the problem or risk losing the engine. The most likely is injectors. A faulty seal at the cp3 can cause this, but that is rare to happen.

On the injectors, it could be one of a few causes.

You have a couple of choices-- first is to pull them, send them out and have them checked to identify which is the problem and replace it.

The second choice is to replace all of them now and be done with it. With that many miles on the truck, they are probably all borderline and I would replace them all at this point.

 

Seems to start okay. Not really much smoke on starting either.

I drained the crankcase and filled with fresh oil and filter and ran it for a short while...does not seem like it is filling back up with diesel quickly.

Would it be possible/common for an injector to stick or leak badly and then not leak as bad? Or once they start leaking they keep leaking?

How can I check the crossover tube? Is that under the valve cover? Thanks

 

I wouldn't even start your truck with questionable injectors. The risk is too high.

The good news is that working on the 2003-07 5.9L CR Cummins is very straightforward. You can pull your injectors for testing or replacement yourself.

Here is some excellent info:

http://www.dynomitediesel.com/Produc...s/Default.aspx

http://www.cumminsforum.com/forum/3r...s-springs.html


There are many places to send your injectors for testing. Ask around for good local shops or Dynomite Diesel or Exergy are popular.


I would be researching additional fuel filtering also to protect your new injectors.

There are tons of options but I really like Glacier Diesel products & have had their air horn fuel filter for over 5 years:

http://www.glacierdieselpower.com/pr...id=MK20306-BLK

 

sounds like injectors to me my friend...

 

Injector kill test can identify which one or which ones are over fueling.

 

How can I perform an injector kill test?

I want to check compression while the injectors are out...I guess I will need to re-install the rockers to do this...anybody know the valve lash on these?

Shop an hour away wants $100 an injector to test,calibrate and clean if they check out and $350 for each bosch rebuilt injector if they don't check out.

Are the HO injectors the same as my low ouput Ca auto motor?

Anybody know a good place to send them out for testing? Or get rebuilt/new injectors for a decent price?

I need to keep the truck pretty much stock to pass California smog check and smoke test.

Drove it today about 30 miles and there does not seem to be diesel in the oil again...yet.

Thanks for all the help.

 

You can with the common rail block off fitting for injector testing. http://hoeslidiesel.com/store/page13.html

The '03-04 HO and SO injectors are the same.

Personally I would buy new. You will get the latest injector body which is more robust.

MikeyB

 

Where in CA are you? $100 per injector is high. Typically all 6 can be done for around $300-350.

Injector kill doesn't always point to the culprit. For instance, there is a check ball under the solenoid shroud that can leak and cause the problem. (uncommon problem, but I've seen it) That one is a slow leaker (like you describe) and will not be diagnosed with injector kill.

new injector bodies can be difficult to get presently and some are charging a premium as a result. (supply and demand)

Yes, sometimes an injector can leak, then not as bad. Sometimes there is not a good seal where the nozzle meets the body and pressurized fuel will squirt out the side instead of going down the tip. This will leave a telltale clue referred to as a pressure trace which can be seen when removing the nozzle and looking at the top. It is possible it only leaks at a certain pressure level as well.

There are a lot of varibles to consider in what is wrong and it may not be readily apparent. I've seen guys "out cheap" themselves. In other words, they don't want to-- or can't-- spend the money for all new injectors but end up spending more money in labor in the long run trying to track down the "smaller- cheaper to fix" problem.

Your injectors may be able to be rebuilt. Certainly with the miles you have and the older bodies, there is wear in there and you'll most certainly have too high leak back rates. Also with stix that old, your solenoid response times are sure to be somewhere between borderline to too slow. Again, lots of things to consider.

If you have the ability to do so, I really recommend saving the money and just get yourself some new stix and be done with it.

 

Diamond Diesel in Oakland quoted the $99 per an injector to test, clean and calibrate each injector. They are about an hour north of me so I may as well send them out elsewhere.

Where can I get the new updated injectors for a good price?

Where can I find an adapter to put into the injector hole to check compression?

What is a good compression number range?

Thanks Again...