well just got my truck back from the dealer ship and they said they can't hear the knock. and they can't change out the pump with out being able to fail it. also i have a cracked retaining screw in the pressure limiting valve and they won't replace it since there is no performance loss even though the break is visible. talk about some BS

 

WARRANTY now a days is as good as ****. BUY USED

 

I'm going to take my truck in again and try the CP3 gear indexing thing. I am going to get this, come heck or high water.

 

Just out of curiousity, did your truck start doing this in the last month or so? Mine does it too - every year about this time - once it gets to about 45 and below the sound of the engine changes - at least that's what I think I'm hearing - and I have to remind myself every year that it's colder and the truck sounds different in colder weather.

Over about 45-50 and the engine hardly makes any noise, but once it gets below that it clatters alot more.

Just my 2 cents....

 

You know truckjunkie, now that you mention it, it seems it HAS been since the weather got colder. Might have to do with timing and intake air temperature. I wonder if when the engine is cold, if the timing is default until operating temperature is reached, and then it re-adjusts the timing.

Good point!

By the way, what dealer do you recommend around here, as I will go to St. Louis if I have to, if this knock doesn't go away come spring time.

 

Hey - sorry it's taken me so long to respond - I haven't looked at this thread in a while. I don't really have any recommendations for dealer service, because I don't go to the dealer very often if I can avoid it. The only input I have is Zeiser Dodge in St. Peters replaced my CP3 when it was slightly leaking without any issues. They were OK with my gauges - because they're only gauges I suspect (no mods at all on the truck).

As far as the knock/rattle is concerned - mine seems to have quieted down again - I'm actually using a bit less Power Service than I was before, and it seems to have quieted down a bit - even with the temperature variances we've experienced here lately.

Let's see - other dealers - the only other one I could think of would be Lou Fusz Dodge, who is now in O'Fallon (moved from Manchester out to O'Fallon a couple of months ago). They're on Highway K about halfway between 40 and 70. Nice looking place - I went in to talk to Bill Miller one day, but he wasn't around.

 

I believe that it is just the colder weather, mine is louder in the winter months and remember it is a diesel engine, they do make knocking noises. I have 22k on mine and it makes different knocking noises everytime I start it up.

 

Thanks for the replies,

Thank you truckjunkie. I know where the O'Fallon one is you're talking about.

Actually, yesterday I took my truck to the dealer. Talked to them about the CP3 indexing/timing. The tech that worked on my truck just got back from a Cummins class and he showed me on the gear itself that there is a 3 digit number where it needs to be. He took it off, turned the engine a few degrees, re-installed, and started it. Much louder.

So, I asked about carbon buildup. Took one the injectors out. Yup, there's our problem. They used some Justice Brothers in the fuel.

Wow, has that made a world of difference. Like everybody always says, the tech told me just to hook up a heavy load once in a while and drive the heck out of it.

Thanks to everybody that replied!

 

ShowMe -
Which Justice Brothers product did they use (Diesel Fuel Supplement or Diesel Fuel Treatment)? Used their products for gasssers in the past, always with good results. Never knew 'til now they have a diesel line...

 

They used the 2-part CDS/770P professional complete diesel service. Still sounds great. Sorry to get back so late with a reply.

 

I wasn't sure if I had valves that needed adjustment or had a pump or injectors making noise, even though I've used Stanadyne for the 70k miles. Two things have pretty much fixed the clicks and ticks:

1. The hood release / latch was rattling. I cut a piece of closed cell foam to place between the latch and hood to keep it from rattling. This got rid of a bigger knock/rattle.

2. Added Stanadyne lubricant additive to the other Stanadyne. This pretty much got rid of the rest of the ticks, but I still sometimes hear a low amount of ticking when it's getting close to 1/4 tank. For me this confrmed that it's not loose valves. I'm looking closer at additives to use, maybe just a lubricant and during the winter a gel point reducer, but whatever it is it'll be a demulsifier. It's a big difference though, so if your current additive allows mixing try spiking with more lubricant.

 

Does any one know of a procedure for indexing the cp3 gears?

 

well i know my tick isn't because of cold weather we had a 70* day here a while back and it was still ticking once the engine warmed up i'm still wondering if it is the cam and i'm about to just go a head and pull the head and install a h2 cam with sportsman springs and my head studs and see if it fixes the problem.