Is it possible for a motor thats making oil to have bad rings? The dealership that just put new injectors in my truck is trying to back up heir work saying that bad rings is causing oil inflation in my truck, which is also why I am seeing excess smoke out the tail pipe. When they ran a compression test on it, 1 and 3 were substantially low, so they put oil in them and got them to pump back up. But now my turck is still making oil and I have excess fuel comming out of the tail pipe. Any suggestions anyone?

 

Need to now the year?

 

I'll move this thread to the appropriate place so you'll get more pertinent answers more quickly if you let us know what year truck you have.

And speaking in very general terms, yes it IS possible you have bad rings.

 

Possible to have a couple low with bad rings, BUT THAT WILL NOT MAKE OIL. A bad Injector, or in some cases, a connector tube will make oil.

Depending on how bad/long it has been making oil, that could be the root cause of the bad rings.

We need a year and some more history before we can go much further.

 

2007 5.9L. When I bought the truck in salt lake the problem must have been pre-existing for some time because a month and a half later I had a hole in the side of my block the size of a water melon. Took me 5 months to get the motor rebuilt, then after driving it for 2 days, the PCM shut down on me and a dealership here in Colorado found the fuel system to be highly contaminated and practically ruined. So $9k later with new injectors and a cleansed fuel system, the truck shuts down on me again driving back to Denver from the western slope but this time it was the wiring harness that came loose. (Yet another problem need solving). It was at this point I found the oil level on my dipstick to be measuring nearly an inch over safe. First thing I did was have the oil change and I monitored how quickly the level was rising. Then came the compression test from he dealership that did my fuel system. So 1 and 2 were very low, 1 being less than 200 psi and 3 about 250. They oiled em and got them to pump up but said they wont sustain because of bad rings, not bad injectors. I had the injectors tested, 1-4 were running low at low engine speeds, but in general they all passed for running.
In my understanding, i thought that if rings are bad, you will get a grey stanky bi-product out the tail pipe because oil will be combusted in the cylinder.

 

The guys at christophers dodge where my fuel system was done

charged me $650 for stock injectors. I could of bought high

performance 150+ hp injectors with that. The mechanic there is

saying because he is a Chrysler trained mechanic he knows

everything about a cummins motor when they are not one in

the same, nor did he know what a CP3 pump is. I have noticed

a lot of smoke characteristic of a tuned motor, but the PCM

was re-flashed with a stock tune. They say its because the pistons arent getting full compression so there is excess fuel being combusted. I dont really know what to make of it

but they are being very defensive with their injectors.

 

If you have low compression in a few cylinders, I'd be talking to whoever supplied you the rebuilt motor. Is it new, if not how many miles? Was it over bored (or re-sleeved) and new rings/pistons?

The oil inflation and smoke says injectors though. I'd take it to a third party shop for independent diagnosis.

 

Brand new block, apparently new pistons, no boring done and no sleeves. If its the rings you would expect it to be lifting oil and showing gray smoke out the tailpipe but I don't get any of that.

I am very confused because all these symptoms do not narrow it down to one thing. The dealership is being very protective of the intectors and insist that it must be the ring and the guy who rebuilt it says that there is no way the rings will go bad with less than 500 miles of driving it with bad injectors.

 

If the injectors were bad or have issue currently still, the fuel could wash the oil away and ruin the rings as well?

 

Thats what I am hearing as well. But what should I be seeing, hearing, feeling, smelling if the rings are bad?

 

The compression test is telling you something is leaking: valves, rings or maybe head gasket (cylinders 1, 2, and 3 low). If they were able to bring compression back up with oil in the cylinder, then I'd say rings.

As stated previously, the over fueling could have ruined the rings, but is sounds like you only ran the new block for two days before getting all new injectors. How many miles in two days?

The rings may not be bad enough yet to burn oil and show smoke out the pipe.

Suggest getting a second compression test/opinion from an independent shop.

 

In those 2 days less than 120 miles. Then the PCM Shut down because of the injectors and fuel system issues.

 

Bad rings never make oil, they cause oil burn off subsequently depleting engine oil. Rings can go bad from a leaking injector, more so than not, an injector that leaks down fuel into the cylinder when the engine is off. An engine that has been rebuilt will use oil while the rings seat during the break in period. As far as making oil you most likely have a bad injector, a faulty of torn injector tube oring from the injector install. Did the dealer put new connector tubes in when they did the injectors, or at least install new orings on them? I would also recommend finding another dealer or shop that actually knows what their talking about. That dealer sounds like a bunch of tards.

 

Tim your a good man. And thank you. We are on the same page with opinions of christophers dodge world. Never go there. I had the injectors tested, which apparently they all passed except 1-4 were running low at slow engine speeds. I dont really know how to read the results sheet and fully understand them or what the stuff means. However, they didn't find any internal or external leakage. I quickly inspected the orings and didnt see any slits or anything in them. As for intector tubes, if those are the metal inserts that are connected to the fuel lines from the manifold then I hightly doubt they did but I will call tomorrow and ask. They carged me 650 per injector.... I hope they did everything neccessary. They say that the cyliders dont have propper compression because of the rings, so they do not fully combust, which leaves excess fuel during the combustion process which is why I am seeing so much smoke for a stock tune... sounds like a lagit idea but if there is blow by, I would imagine the engine power would drop dramatically because less fuel is combusting, but this thing is running like I have a tow tune on it or something. So thats why I am so confused about this whole ordeal.