Who Has the Rattle / Clatter / Knock etc???

Its because there is no pilot injection. I'm sure of it. The Triple nickels only have 2 injection events
 
That's what I thought, but mine sure developed a very similer noise after decompressing, and putting injectors in.
 
HIGH TECH RAM said:
Its because there is no pilot injection. I'm sure of it. The Triple nickels only have 2 injection events
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DING! DING! DING!!


I can't believe nobody's written a program for the 04.5+ trucks to either lessen or get rid of the Pilot....Well, maybe they have but wonder why it hasn't worked for this problem...
 
555's have pilot injection......I don't think they had the shot after the main event....

BUT, dug this up a while back...

Noise Refinement

In 2003, Cummins redesigned the fuel system using the Bosch high pressure common rail system, enabling pilot injection before the main injection. This reduces the spike in combustion pressure for dramatically quieter combustion. For the 2004 Cummins 600 we've added rubber isolators for the valve cover bolts and further reduced the noise at idle by changes to pilot injection.


SO....they made a change to pilot injection, but they also changed injector spray angle, combustion bowl....


I'm still leaning to the Mp8 with downward adjustable rail pressure, put a map in the mp8 to lower rail during the offending time, 95% sure this would help.

Should lower the pilot shot, and it will make up for it with duration.

Cause we all know the odds of getting work done on our tune.....the 6.7's are were its at now.....:bang
 
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Joesixpack said:
I'm still leaning to the Mp8 with downward adjustable rail pressure, put a map in the mp8 to lower rail during the offending time, 95% sure this would help.

Should lower the pilot shot, and it will make up for it with duration.
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Isn't this what DonM is doing with his custom pressure box??

He mentioned letting me try one as a last result but I'm STILL freakin waiting on my RP gauge to come off backorder so I can give him the results from my setup......

I'm betting this would really help though!!
 
Big Swole said:
Isn't this what DonM is doing with his custom pressure box??

He mentioned letting me try one as a last result but I'm STILL freakin waiting on my RP gauge to come off backorder so I can give him the results from my setup......

I'm betting this would really help though!!
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Yep, once you get the rail guage and have some good numbers, give it a go.

Pretty sure this would make a difference, drop the pressure down simular to the 03's-04's.

That's one difference that I know of, they have lower pressure to begin with. Try and match what their running.

I have a mp8, and how I'd make the map is say up to 25% would be under pressure.......25% stock and then after 25% start ramping it up.
 
Sorry if I'm throwing something out there that you all know about, but how many of you that have common rails with this noise, have pulled the fuel pump off? Did you know that it is "timed" with the engine from the factory to reduce noise?

Again, sorry if everybody knows this, just trying to help.
 
blu_by_u said:
Sorry if I'm throwing something out there that you all know about, but how many of you that have common rails with this noise, have pulled the fuel pump off? Did you know that it is "timed" with the engine from the factory to reduce noise?

Again, sorry if everybody knows this, just trying to help.
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are you talking about the cp3 gear , I read that rotating the gear a bit will lessen the noise,I read this on another forum and wicked diesel said it works. I'm not sure how it helps my self, but if the guys from wicked say it helps it may be worth a shot if it hasn't been tried. sorry if it's off topic :Cheer:
 
this has been mentioned for a while now. Some seem to think it works. The problem is, the CP3's " aren't " timed mechanically. There may be something to clocking them to eliminate gear lash but, that's not where our rattle is coming from.

I would think if it had something to do with the rattle, the rattle would be there all the time. At idle and even revving up the truck while in park, my truck purrs like a kitten..... no ratt;e what so ever. It's only when under load and when warmed up does the rattle really kick in.

Plus, as I've mentioned, the rattle is there in my wifes totally stock truck just not near as predominate as in ours.
 
This is the list of CompD members with the noise so far....

Big Swole = David Elrod
Triton = Ty
onetun
soulezoo
EPA Violator = Jay
HIGH TECH RAM=Chris
cbtoyz=Colin Beddow
Smokingoat04=Josh
jaredb900rr = Jared
12valve
Squatch



And for the Record.....THIS IS NOT THE CP3 GEAR LASH NOISE!!!!!
That's a totally different deal and yes, some have had good results from clocking the gear....I only WISH that was my problem!! Thanks though!
 
bigorange said:
are you talking about the cp3 gear , I read that rotating the gear a bit will lessen the noise,I read this on another forum and wicked diesel said it works. I'm not sure how it helps my self, but if the guys from wicked say it helps it may be worth a shot if it hasn't been tried. sorry if it's off topic :Cheer:
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Yep, that's what I'm talking about. They are supposed to have it timed at the factory to reduce noise. I say "supposed to" because everybody makes mistakes.
 
Big Swole said:
This is the list of CompD members with the noise so far....

Big Swole = David Elrod
Triton = Ty
onetun
soulezoo
EPA Violator = Jay
HIGH TECH RAM=Chris
cbtoyz=Colin Beddow
Smokingoat04=Josh
jaredb900rr = Jared
12valve
Squatch



And for the Record.....THIS IS NOT THE CP3 GEAR LASH NOISE!!!!!
That's a totally different deal and yes, some have had good results from clocking the gear....I only WISH that was my problem!! Thanks though!
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I wasn't referring to "lash". I'm talking about timing the CP3 to the engine.....Just making sure that we're talking about the same thing.
 
blu_by_u said:
I wasn't referring to "lash". I'm talking about timing the CP3 to the engine.....Just making sure that we're talking about the same thing.
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what you're talking about is lash. The CP3 is turned by the cam. It's possible to get gear lash between the CP3 gear and the cam gear. This is not what this thread is about.

FYI ..... direct from the service manual

FUEL INJECTION PUMP TIMING
With the Bosch injection pump, there are no mechanical adjustments needed or necessary to accomplish fuel injection timing. All timing and fuel adjustments are electrically made by the engine mounted Engine Control Module (ECM).


As you can see.... the CP3 is NOT timed so it's not something the factory forgot to do.
 
Timed is the wrong term. The CP3's are "phased" to the engine. The pulses that the CP3 produces can be out of "phase" with the injector openings. This out of phase can cause noise and rough running. There is even a TSB out for the 6.7's to change the phasing to reduce those problems. I do know that this does work on some trucks.

On trucks with dual CP3's though, I'm not sure how this would relate. You end up with twice (potientially) as many pulses, though they maybe smaller pulses, and the second pump is belt driven.

It might be something to look at though. I wonder if all of the trucks that are making the noise have had the orginal CP3 removed, and re-installed...

Paul
 
paulb said:
Timed is the wrong term. The CP3's are "phased" to the engine. The pulses that the CP3 produces can be out of "phase" with the injector openings. This out of phase can cause noise and rough running. There is even a TSB out for the 6.7's to change the phasing to reduce those problems. I do know that this does work on some trucks.

On trucks with dual CP3's though, I'm not sure how this would relate. You end up with twice (potientially) as many pulses, though they maybe smaller pulses, and the second pump is belt driven.

It might be something to look at though. I wonder if all of the trucks that are making the noise have had the orginal CP3 removed, and re-installed...

Paul
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I understand what you're saying Paul but, if that was the case.... it would be in the service manual as something that needs to be done when building the motor or when the CP3 is removed. My quote in blue up there is straight from the service manual. " there's nothing to be done, the ECM does it "

I also have a Ciummins account to where I have access to instructions for a complete rebuild. It says nothing about timing or phasing the CP3.

The fact the second CP3 is belt driven is proof as it needs nothing to pump the fuel other than electronics to communicate with the ECM

My wifes truck has the same rattle and has never had the CP3 removed.
 
blu_by_u said:
I wasn't referring to "lash". I'm talking about timing the CP3 to the engine.....Just making sure that we're talking about the same thing.
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Gear lash!!

Not Valve lash!!


TY explained it!!


BUT once again, this is NOT the noise we are hearing.....My truck does have a tapping noise at idle and above probablly because I did a complete build but it doesn't bother me NEAR as much as this timing rattle / clatter / pinging!!!
 
LIST for the timing (etc) Rattle.....Not cp3 knock/tick

Big Swole = David Elrod
Triton = Ty
onetun
soulezoo
EPA Violator = Jay
HIGH TECH RAM=Chris
cbtoyz=Colin Beddow
Smokingoat04=Josh
jaredb900rr = Jared
12valve
Squatch
 
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