The new C15 acert engine
Grizzly

Valley Springs, CA

#626 May 30, 2012
Well Crap!All that good luck with my acert turned on me the other day. I took #6 vva apart to clean it and now its backfiring.Couldn't get it right so I took it to Holt in Stockton.$1150.00 and its still not right.There tearing into it again tomorrow.I wonder if the fuel injectors play a role in making the vva's work the way their supposed to? Because when I change my fuel filters my pressure gauge is perfect but then as time goes on it start to fluctuate really bad.Also when I go to start the engine sometimes it goes into a hydraulic lock as if one of the cylinders is filling up with leaking fuel? maybe I'm starting to develope an injector problem? 465,000 miles on it . gs
Ken

Marion, IN

#627 Jun 1, 2012
Grizzly wrote:
Well Crap!All that good luck with my acert turned on me the other day. I took #6 vva apart to clean it and now its backfiring.Couldn't get it right so I took it to Holt in Stockton.$1150.00 and its still not right.There tearing into it again tomorrow.I wonder if the fuel injectors play a role in making the vva's work the way their supposed to? Because when I change my fuel filters my pressure gauge is perfect but then as time goes on it start to fluctuate really bad.Also when I go to start the engine sometimes it goes into a hydraulic lock as if one of the cylinders is filling up with leaking fuel? maybe I'm starting to develope an injector problem? 465,000 miles on it . gs
You "cleaned" the VVA? Did you remove just the bolt-on solenoid, and seperate the sections? Or did you try to do something else with the actual valve & piston located in the jake housing?

We change our fuel filters every 30 days, they were starting to plug-up around 5 to 6 weeks. The injectors have nothing to do with how the VVA system operates. The bigger problem is that most of these "techs" don't know how to properly adjust the overhead on the Acerts, nor do they understand how the VVA system truly works :(

You can replace these VVA solenoids for a reasonable price, Cat recommends that they be changed in pairs (1 & 2, 3 & 4, 5 & 6). I pay $310 for two in a box ($155 each).

Have you ever had the rocker arm bars inspected & retorqued? You're at the mileage where many of these engines "break or bend" the bars. If one is loose now it could be causing the "hydraulic lock" symptom you described, since the intake & exhaust valves won't open fully. It can also cause the engine to miss. So sorry you had to visit Holt in Stockton, have heard nothing but bad stories about that place....good luck!
Grizzly

Valley Springs, CA

#628 Jun 2, 2012
Well I just got dinged for another $1400 . They ended up replacing the rest of the solenoids and IVA pressure sensor control valve . Had to agree with them to run it on the dyno. I am NOT a dyno fan . Before I paid my bill i checked their work and found the wiring around the thermostat housing and behind my ac compressor was melted. they fixed all that on their time . Seems to run ok now.I just wish people knew how to troubleshoot. What I paid them to do I could have done all this myself.
Grizzly

Valley Springs, CA

#629 Jun 2, 2012
Hey Ken , When I pulled off #6 I just sprayed it with some contact cleaner between the pieces and in the oil passages then blew it off with air . I don't think it did anything. Isn't it usually the magnet that goes bad ? thanks for the input . G
Ken

Marion, IN

#630 Jun 5, 2012
Grizzly wrote:
Hey Ken , When I pulled off #6 I just sprayed it with some contact cleaner between the pieces and in the oil passages then blew it off with air . I don't think it did anything. Isn't it usually the magnet that goes bad ? thanks for the input . G
It's a magnetically-operated internal switch that diverts oil from one passage to another. Every solenoid inside the head (VVA & Jake) work the same way, it's all based on oil flow & pressure. The head requires at least 42 psi along this "rail" so that the VVA & Jake brakes work properly. This is why there is a "seperate" oil pressure sending unit on top of the head, next to the oil-flow control solenoid.

There are 9 critical o-rings on this system, and they can cause the pressure to be off in any one of the 3 jake housings, affecting the output on 2 of the VVA's. I've changed these o-rings on a few units & had the VVA start working properly again...money saved!

I agree with you, good troubleshooting skills are getting harder to find these days. Everybody tries to "rely" on computers. Sure, I have the Cat ET program, it's a necessity to maintain our fleet. But if you don't take the time to learn "how & why" the equipment operates the way it does, you can't properly repair it :(

If you have any Cat questions, post em' here...good luck with your truck!
farmer

United States

#631 Jun 13, 2012
the only engine cat ever built that was good was the 3406! C15 is a piece of shit. the 500 ISX will out pull out last and use less fuel than that C15! stud updates, cat brake, harnasses transfer pump twin turbos, piss poor design!
Bruce

Norwalk, CA

#632 Jun 16, 2012
I have a 08 C15 that is giving me a check engine light and tells me DPF secondary and Air Diff Pressure. Anybody else get this or hear about it? Thought it was the spark plug, so I replaced it but no such luck. I can't seem to find any info on this.
AGB

Lawrenceville, GA

#634 Jun 26, 2012
Hello Ken, my Dad seems to have a problem with his 2007 C15 ACERT, he was wondering how he might be able to contact you? From what he desribed it sounds like the turbo(s) may be starting to go. Perhaps you could provide an address/contact info for your shop in Indy? Thank you in advance.
Ken wrote:
If any of your friends are still running these Acerts, they can post ANY question here & I will be happy to provide the correct answers, or they can bring it by MY shop for a "tune-up" :)

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#636 Jun 27, 2012
I replied last night, but somehow the post was "deleted"...maybe somebody didn't like me posting the company address & phone number?

We're a trucking company located in Marion, about an hour north of Indy on I-69. I'm not on here to 'solicit or advertise' in any way, just providing "free" advice to others & sharing my knowledge!

I went ahead & signed-up for an account, so that I can receieve "personal messages" on this site. That way I can share our address & phone number with those interested, as well. Thanks!
Jerry

Henderson, NV

#637 Jun 30, 2012
I just got my IFTA 1/4's done and got 6.75 mpg on my 387 Pete with a C15 18 speed and 3.36 diffs. I previously stated that I do run light but, its mostly oversize in the western US. I had PDI do an level 1 upgrade. My oil is staying cleaner, longer and consumption is less. The truck has 670K miles on it. I love my CAT!!
Navi

Haslet, TX

#638 Jul 20, 2012
Is 2005 cat c15 twin turbo with 700k worth buying?? Please advise also r mpg same as c15 single?

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#639 Jul 21, 2012
Navi wrote:
Is 2005 cat c15 twin turbo with 700k worth buying?? Please advise also r mpg same as c15 single?
First of all, it's a Cat and will never get the same fuel mileage as a Cummins or Detroit. We have both single & twin-turbo C-15's in our fleet, and the fuel mileage is about the same.

The first twin turbo's (2003, 04) had serious performance issues & very poor fuel mileage. If the engine serial number begins with BXS or MBN, avoid this engine. Our twin turbos are 2005 & 06 engines, and the serial numbers begin with MXS.

Is the truck you're looking at a 2005 with a 2004 engine, or is it a 2005 engine? Look at the stickers on the engine, there's one on the driver side attached to the head, also one on the passenger side attached to the oil cooler housing. This will tell you the year of manufacture, and also the engine serial number. Good luck!
Navi

Cypress, TX

#640 Jul 21, 2012
Ken Mech wrote:
<quoted text>
First of all, it's a Cat and will never get the same fuel mileage as a Cummins or Detroit. We have both single & twin-turbo C-15's in our fleet, and the fuel mileage is about the same.
The first twin turbo's (2003, 04) had serious performance issues & very poor fuel mileage. If the engine serial number begins with BXS or MBN, avoid this engine. Our twin turbos are 2005 & 06 engines, and the serial numbers begin with MXS.
Is the truck you're looking at a 2005 with a 2004 engine, or is it a 2005 engine? Look at the stickers on the engine, there's one on the driver side attached to the head, also one on the passenger side attached to the oil cooler housing. This will tell you the year of manufacture, and also the engine serial number. Good luck!
Thanks for the information I will find out monday what year was the truck made and the year of the engine. Are the twin turbos are just as powerfull as the single turbo? Ive owned a single c15 and loved it very strong had no issues
rufus

Albany, NY

#641 Jul 21, 2012
Ken do you know of a a way to just disable the vva's and enjoy the nice boost of the twin turbos?
Ken wrote:
<quoted text>
It can be done, but it takes some work. The Accerts use twin turbos to move more air & create a higher boost pressure, which works hand-in-hand with the IVA system (Intake Valve Actuators). The expense of converting it to a single turbo probably outweighs the benefits....
A single turbo for an earlier C-15 engine would work, but you'll have to reprogram the ECM with a new "profile" for the engine. I would use the profile for a 2002 engine (serial number beginning with 6NZ). You will also have to "disable" the IVA system, and replace all of the housings above the rockers, if you want the engine brakes to work. Use housings from a single turbo C-15. The way your engine is configured now, these housings contain two IVA solenoids & one jake brake solenoid. You can't just "back-off" the IVA solenoid pistons, because the entire system (jakes included) is operated by oil pressure, which is controlled by the IVA system. When you disable the IVA system, you also disable the jakes :(
The truth is, if your twin-turbo is properly tuned, it will out-perform the older single turbos. We have both engines in our fleet, and I've done extensive work on each. Good luck with your truck!

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#642 Jul 22, 2012
Navi wrote:
<quoted text>
Thanks for the information I will find out monday what year was the truck made and the year of the engine. Are the twin turbos are just as powerfull as the single turbo? Ive owned a single c15 and loved it very strong had no issues
Only the twin turbos from 2005 & 2006 engines. The 2003 & 2004 had low power & poor fuel mileage issues, and the turbo's failed more easily. NEVER buy a C-15 manufactured from 2007 on...the emissions problems with the DPF ran many people out of business, since Cat wouldn't stand behind their product warranty. That's one reason Cat stoppped producing truck engines for on-road use!

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#643 Jul 22, 2012
rufus wrote:
Ken do you know of a a way to just disable the vva's and enjoy the nice boost of the twin turbos?
<quoted text>
As you read in my previous post, if you disable the VVA system, you lose the jakes too. Without the VVA's you wouldn't be able to "create" that boost in the first place, either!
Navi

United States

#644 Jul 23, 2012
Ken Mech wrote:
<quoted text>
Only the twin turbos from 2005 & 2006 engines. The 2003 & 2004 had low power & poor fuel mileage issues, and the turbo's failed more easily. NEVER buy a C-15 manufactured from 2007 on...the emissions problems with the DPF ran many people out of business, since Cat wouldn't stand behind their product warranty. That's one reason Cat stoppped producing truck engines for on-road use!
Thanks for this information I was worried about the twin turbo engines I will make sure the engine is built in 2005 or 06 again thank you!
Navi

United States

#645 Jul 23, 2012
Ken Mech wrote:
<quoted text>
First of all, it's a Cat and will never get the same fuel mileage as a Cummins or Detroit. We have both single & twin-turbo C-15's in our fleet, and the fuel mileage is about the same.
The first twin turbo's (2003, 04) had serious performance issues & very poor fuel mileage. If the engine serial number begins with BXS or MBN, avoid this engine. Our twin turbos are 2005 & 06 engines, and the serial numbers begin with MXS.
Is the truck you're looking at a 2005 with a 2004 engine, or is it a 2005 engine? Look at the stickers on the engine, there's one on the driver side attached to the head, also one on the passenger side attached to the oil cooler housing. This will tell you the year of manufacture, and also the engine serial number. Good luck!
The cat twin turbo engine serial # starts with MXS that means I should be good??????
Navi

United States

#646 Jul 23, 2012
Jerry wrote:
I just got my IFTA 1/4's done and got 6.75 mpg on my 387 Pete with a C15 18 speed and 3.36 diffs. I previously stated that I do run light but, its mostly oversize in the western US. I had PDI do an level 1 upgrade. My oil is staying cleaner, longer and consumption is less. The truck has 670K miles on it. I love my CAT!!


How much does pdi costs?

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#647 Jul 23, 2012
Navi wrote:
<quoted text>
The cat twin turbo engine serial # starts with MXS that means I should be good??????
Yes...all of out twin-turbos start with MXS...best one available! I believe that PDI he was referring to was Performance Diesel Inc located in Salt Lake City, UT.

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