I'm new to the board so I apologize if this has already been covered.

...07' 5.9L with an annoying/embarrasing "KNOCK". I have been to several dealerships asking about my situation. Not ONE mechanic has given me a straight answer, except for one...maybe.

(1) mechanic explained to me that the knocking sound is from my injection pump "out of timing". He said it can be fixed with a "little luck".

I have already performed a Valve Lash Adjustment at 40K, just to try and eliminate by process. NO LUCK... the sound didn't change at all.

MY QUESTION........ Has anyone ever heard of or experienced an injection pump "out of timing"?

To be quite frank, I am just sick and tired of dealing with Dodge. At first, I owned a 6.7L. Check engine light kept coming on... Every Serv.Mgr. just said, "if the light isn't blinking, don't worry about it" That is until it left me stranded 3 times (and no I didn't let it idle, etc, etc) Ended up being EGR/DPF! Anyhoo, traded it off pretty quick.

To make a long story short, I'm tired of being told "not to worry about it" (especially at 40K w/60K left on warranty)

Thanks in advance for any logical advice,
Barry

 

First, are you sure it's not just "normal" diesel clatter or knock?

And second, the injection pumps are not timed on the CR engines. It's all electronic and done with crank sensors and signals to the injectors. The injection pump produces high pressure that is available all the time to the injectors and they open with current from the computer that is timed.

If it's just one cylinder doing it then it's not a timing issue but maybe an injector.

Maybe you should add some conditioner and work it hard for a few hundred miles. Pull a trailer or go to the mountains or something. If it's not fixed have it checked out by someone other than a clueless dealer.

John

 

when is it you notice the knock ? Is it clatter or a rattle or more a knock ?

Do you know if the dealer put a Starscan on the truck and check all the sensors and parameter of them ?

 

Hey John, thanks for the reply.

As far as sound, I am very familiar with the sound(s) of Cummins. I've owned a couple of 12V's, 98.5 24V, 6.7L, now this one. Many people have come up to me while fueling and have expressed concern. More embarrasing, I think.

As far as running the truck... I use it for 1 purpose only. I haul travel trailers and boats throughout the country. Avg 4K miles/week. At EVERY fill up, I use 6oz. of Lucas Cond (30-34 gal) to help w/ULSD. At each oil change I use Val.Prem.Blue w/1 bottle Lucas. Also, I live in Colorado, so it works in the mountains occasionally.

Taking it to the right person has been the tricky part. I have exhausted the Dealership's advice, have even gone to a couple of Cummins. Most say it sounds like a fuel knock, but most have eliminated the injector theory based upon performance, etc... Runs excellent, NO misses or burps, exceptional fuel mileage (22 empty, 12-14 towing at 1800 rpm's 65mph) That's why the "injection pump theory" made sense, I guess. He said he had seen a few like that and fixed (1) successfully.

Like I said, it's just more of an embarrasing thing. Just doesn't have that smooth rumble like I'm used to.

 

......I notice the knock at all times, gets a little louder when you put it in gear. It ECHOES when I pull in to get fuel under a canopy, or any kind of "echoey" places.

SOUNDS LIKE A HIGH PITCHED LIFTER/ROCKER ARM NOISE. Hense the reason I adjusted the valve lash just this morning.


This time I go back, I will demand for them to put it on a starscan and check (and get my high idle, too)
Thanks, B

 

Barry,

Hope you get it solved.

By the way, PM me if you are interested in towing a 48' enclosed, triple axle, Wells Cargo fifth wheel trailer from the Bay Area to Gardenerville, NV. Trailer will be nearly empty and has good tires.

Thanks, John

 

please post back with their findings on the scan or any fix you end up finding if you do.

Can say it's the same problem but several people lately have had a knock, rattle, clatter of some sort and it's very difficult to narrow down why or where. it's coming from.

Good luck !

 

Thanks Guys, I'll keep ya updated... and John, I'll be in touch.

 

Yes the injection pump can get out of time with the engine, it causes a knock because of gear backlash in the drive gears. There are threads about this and some people including myself have fixed the annoying knock by pulling the drive gear loose and turning the engine, then tightening the cp3 drive gear again. I dont have the link handy but do a search. It's a known problem at Dodge, they have a TSB about changing the cam drive gears because of excessive backlash and noise, rather than try to get the pump and engine in synch they just replace the drive gears.

 

WOW... thanks alot for that. That's exactly what the guy tried explaining to me. I'm taking it in ASAP! Can't wait

 

BTW... Since I travel everywhere, can you or anyone else recommend a dealership that is worth a damnn and has had experience with this so I can get it fixed correctly. It's still under warranty so it would be covered, BUT I would much rather pay someone that knows.

.......A recent experience w/ Dodge really iced the cake for me. Brought my truck in to talk with the "Head Diesel Mech." about the knock. He stands 40 ft from my truck and says, "Kinda sounds like a fuel knock, at least thats what the book says".... But nothing to worry about." My last (2) purchases w/ Dodge have been very frustrating. VERY poor service. If it wasn't for what's under the hood, I would consider something else. (except a ford)

Thanks Again!