The new C15 acert engine
paul

United States

#586 Jan 13, 2012
Rafter B Farms wrote:
Brownshlager,I have been told that with my 500,000 miles warranty that the breaking bolts would cover but the damage done by the breaking of the bolts and damaging the head is a gray area. How bout that CAT Warranty?
Not true all should be covered,just went thruogh it myself.
nomatter

Tulsa, OK

#587 Jan 20, 2012
lizardtaimer wrote:
<quoted text> buy it the acert is the best deisel engine ever produced, it just has to be tuned properly. im making 1500 hp and getting 6 mpg with a bxs. if you dont believe it heck out my youtube dyno runs my channel is lizardtaimer. i can sell kits for a variety of hp a fuel milage apps.
i am about to by a bxs would u email a contact # [email protected] i would like just a good tuneup
Bluestar

United States

#588 Jan 25, 2012
I've found the best return on investment whether new truck or used is to first run the overhead them put it on the dyno. On the dyno they can match your fuel curve to your rpm and change a couple other things. This will greatly improve performance and economy. I have a 2008 western star 4900ex w/C-15 rated at @475...since doing this it now shows @512hp! My mpg went from 5.1 avg to 5.4...the math is easy on this one.
exracer1985

La Quinta, CA

#589 Jan 28, 2012
Hello All,
I'm new to this forum and have a question.
I'm considering buying a motorhome with a 600 caterpillar engine. The engine number is
MXS 68581 and believe it to be an 05 engine with 19,000 miles.
After reading the issues with these Accert engines,
I'm having 2nd thoughts about the purchase.
We are retired and don't want to be in the shop or go broke fixing it.
Any opinions would be appreciated.
Thanks
Ken

Brownsburg, IN

#590 Jan 28, 2012
exracer1985 wrote:
Hello All,
I'm new to this forum and have a question.
I'm considering buying a motorhome with a 600 caterpillar engine. The engine number is
MXS 68581 and believe it to be an 05 engine with 19,000 miles.
After reading the issues with these Accert engines,
I'm having 2nd thoughts about the purchase.
We are retired and don't want to be in the shop or go broke fixing it.
Any opinions would be appreciated.
Thanks
My advice would be to "steer clear" of that vehicle! Why any RV manufacturer would install one in the first place is beyond me...
I run the shop for a medium-sized trucking company, and 90% of the engines I work on daily are C-15 Acerts. The are expensive to maintain, more so than a Cummins or Detroit diesel. The C-15 contains more electronic parts inside the head that can fail, as well. I change these pieces constantly :( Good luck finding a more suitable vehicle!
exracer1985

La Quinta, CA

#591 Jan 29, 2012
Thank you Ken,
We now have an RV with a cummins ISM 500 with 140,000 miles and the only issue we have had was a cooling fan failure(O ring) which really isn't an engine problem but a chassis issue.
I agree the electronic parts in the head can be very expensive and since we fulltime in our RV,can also lead to down time.
This RV mfg had some management changes in 05/06 and the new guys came from guess where. Caterpillar. So they changed from cummins to cat,but now have gone back to cummins.

Again thank you for the advice and we will take a pass on this RV. Actually not sure I want to give up the one we have.:))
Ken

Brownsburg, IN

#592 Jan 30, 2012
exracer1985 wrote:
Thank you Ken,
We now have an RV with a cummins ISM 500 with 140,000 miles and the only issue we have had was a cooling fan failure(O ring) which really isn't an engine problem but a chassis issue.
I agree the electronic parts in the head can be very expensive and since we fulltime in our RV,can also lead to down time.
This RV mfg had some management changes in 05/06 and the new guys came from guess where. Caterpillar. So they changed from cummins to cat,but now have gone back to cummins.
Again thank you for the advice and we will take a pass on this RV. Actually not sure I want to give up the one we have.:))
I'd keep that Cummins for the reliability & fuel economy (compared to a Cat)! We have two Cummins engines in our fleet, the old N-14 has over 900,000 miles & has never been rebuilt. The newer ISX has about 400,000 miles...and I've never had to make any "serious repairs" on either engine!

At 140,000 miles, you're just getting it properly "broke-in" :)
blonde moment

Fort Worth, TX

#593 Jan 31, 2012
Does anyone know what kind of jumper wires/wiring harness can be put on a c15 twin turbo engine to improve performance and increase horsepower?
bill

Johnson City, NY

#594 Feb 1, 2012
I love cat have shop.make me alot of money
ediesel australia

Adelaide, Australia

#595 Feb 2, 2012
we have injectors to suit c15 and c15 accerts but not twin coil units will improve power and ecconomy with out rediculusly inbalanced fuel delivery derived from high flow trim codes whitch unbalance the poor trimming of oem injectors
richard

Garrett, IN

#596 Feb 2, 2012
chris wrote:
Cat is the best damn engine ever!!!
If you don't like a caterpillar, then you don't know what 2 like.
NO other engine has the torque and smoothness of a cat diesel
cats ya right ive own more than my share and yes the older ones produce good power but old or nee they all have the same down fall over heat once and you now either have a cracked head or head gasket now you pay $6000 dollars for a new head what a piece of junk as for detroit under powered junk cat wanna be and isx cummins good power but shittie oil cooler and turbo issues only engine thats really worth a damb is an n-14 cummins no seriuos issues except they can develope a leak on the fuel plate going to the ecm to cool it but no worry just by pass it now fixed so now whats so great about cat nothing
Stray cat

United States

#597 Feb 16, 2012
I have an 08 cat its a real dog . Could anyone sug, an honest way to increase the power substantualy
sunny sngh

Aurora, CO

#598 Feb 17, 2012
i have c15 cat 2007 my oil temp always 25 psi more water temp can someone tell me is that right or something wrong with the engine.oil temp goes to 230 psi on the hills evenits winter now.
TANKEROO

United States

#599 Feb 17, 2012
YES, MY C-15 ACERT GETS 6.7 MPG, BUT IT NEVER SEES THE OTHER SIDE OF 1400 RPM EXCEPT DOWNHILL, 3.26 GEAR, JUST HAD INNER INJECTOR WIRE HARNESS GO BAD, FREIGHTLINER IN MT. VERNON ILLINOIS WAS NEAREST, THEY SPENT TWO DAYS, REPLACED AN INJECTOR AND CHARGED ME $1.000.00 AND IT BROKE AGAIN 300 MILES LATER, WENT TO CAT, CHANGED INNER HARNESS AND CHARGED ME $1100.00.
Ken

Brownsburg, IN

#600 Feb 18, 2012
sunny sngh wrote:
i have c15 cat 2007 my oil temp always 25 psi more water temp can someone tell me is that right or something wrong with the engine.oil temp goes to 230 psi on the hills evenits winter now.
This is normal...oil temp can run 230 to 250 under a heavy load/pulling a hill/warmer weather conditions.
Ken

Brownsburg, IN

#601 Feb 18, 2012
Stray cat wrote:
I have an 08 cat its a real dog . Could anyone sug, an honest way to increase the power substantualy
Before you spend any money, or get into the engine (overhead, ECM changes, etc)have the fuel pressure tested. The fuel transfer pump on these engines are notorious for "weak" springs. Cat even sells an upgraded "spring kit" for these pumps. You can easily "shim" this pump yourself, with a 5 cent piece of brass! Also, the fuel pressure regulator on this engine is cheap to buy & easy to replace.

The fuel pressure at an idle should be 70 - 75 psi. At 1800 rpm the pressure should be close to 100 psi. During normal driving conditions, it runs about 85 psi. Good luck :)
Sam

Pelham, AL

#602 Feb 19, 2012
Birdsy wrote:
Acert mod.. I pull oversize overweight. Getting 55 to 60 lbs boost... 07 c15 550 hp..
10k ohm resistor in place of air intake temp sensor
100 ohm resistor in place of fuel temp sensor
On a 05 c15 acert mxs my air intake factory harness has 3 wires, could someone let me know in detail where to put a resister? Do I unplug from the sensor and put the resister in the plug? Or do I clip one of the wires and use butt connectors and put the resistor in line? I've already put a 150ohm resistor on the fuel temp wire and it made a difference in pulling power! Would I be better off with a 100ohm resister on the fuel temp wire?
paul ontario

Etobicoke, Canada

#603 Feb 25, 2012
if you have lots of money for poor fuel mileage high parts costs u go ahead if you really want to make money with minimal down time and good access to service u will go green DETROIT DIESEL
Sam

Pelham, AL

#604 Feb 25, 2012
Sam wrote:
<quoted text>On a 05 c15 acert mxs my air intake factory harness has 3 wires, could someone let me know in detail where to put a resister? Do I unplug from the sensor and put the resister in the plug? Or do I clip one of the wires and use butt connectors and put the resistor in line? I've already put a 150ohm resistor on the fuel temp wire and it made a difference in pulling power! Would I be better off with a 100ohm resister on the fuel temp wire?
Hey Ken , about the air intake sensor, do I just unplug it and put the resister in like I did on the fuel temp wire? Sorry to keep asking but could you give me very detailed instructions this? Thanks man!
Ken

Marion, IN

#605 Feb 26, 2012
Sam wrote:
<quoted text>Hey Ken , about the air intake sensor, do I just unplug it and put the resister in like I did on the fuel temp wire? Sorry to keep asking but could you give me very detailed instructions this? Thanks man!
To be honest with you, I don't modify either sensor. I have read about it in various forums, but altering the resistance reading only causes the ECM to change the "timing parameters". You may experience an in increase of boost, or power...but your fuel mpg will drop off :(

The best thing you can do with ANY C-15 is to ensure proper fuel pressure first, run the overhead, connect it to the Cat ET program & properly "tune" the engine/ECM. The IVA system on these twin-turbo Acerts is very complex, and if the proper oil pressure isn't maintained along that system (42 psi minimum) the engine will run like a "dog", and the jakes won't work at full strengh.

I realize you probably don't have access to the Cat program, but it's really the only way to make sure that all of the electronic parts are functioning correctly. We've got a fleet of W-900's running these Cats, matched with 13 speeds & 3:42 rears. I've got them set @ 550 hp, governed @ 73 (east) & 75 (south). They're pulling the hills @ 65 to 70, just "thumbing" the top 2 gears, and the fuel is 6.1 to 6.5 mpg. These engines CAN be made to perform properly, but unfortunatly, there's a shortage of "qualified" mechanics these days...many dealerships employ "parts changers", not "problem solvers" :( Good luck with your truck!

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