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Elsmore, Kansas | Any reason to shy away from this motor? I did a search and it seemed like the air intake actuators seem to be the biggest issue with the Accerts and the twin turbos being the next big issue. Also read several post that mention doing a single stage pdi tune really helped these engines. This truck won't see a ton off annual miles and will pretty much only pull a hopper. |
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ecmn | The actuators are probably the biggest thing. Turbos are pretty reliable on the C-15's. I just bought 1 this spring, overall satisfied but need to figure out how to get the fuel mileage up. I was looking really hard for a 6nz but just couldn't find a good 1. Currently am only getting about 5.2-5.3 out of it. Was really hoping it would be better, seems to have a lot of power though. |
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SE MT | don't remember the first year for the acert, might have been 04... if it's a twin turbo, it's an acert motor.
Biggest drawbacks on them are the fuel economy. Best thing for that is to get them producing more hp. back when I used to dyno them, the more we could get out of them, the better mileage they got. don't know if Cat can tune towards the high side of "spec" on the fuel rates anymore. Might be limited to a programmer, and I have no experience with those.
As for mechanical issues, keep an eye on the exhaust manifold studs for breakage, as well as the upper (high press) turbo mounting studs. they'll break on occasion and it's best to catch them early. if one breaks, the others will be on their way shortly.
BXS and MXS C15s were no bad engines. MXS serial number had maybe a few more updates, the CAT brake/IVA actuator was one housing instead of two. If I could pick one I'd pick the MXS, but you won't go wrong with the BXS either.
Those engines didn't look so hot compared to a 6NZ, but compared to todays junk, they're a gold mine. Just don't buy an engine with EGR, whatever you do. Guaranteed a 400K motor or less. |
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N.W. Iowa | I was told the 04 was a bridge motor and they had a lot of problems. |
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Central KS | 04' will probably be a single turbo with an MBN engine prefix. They were the bridge motor between the 6NZ and the Accert twin turbo motors. I would have one before I would ever consider an Accert. Never heard a good thing about the twin the turbo engines.
I believe you can have the ECM retuned to 6NZ specs, and have a good strong motor out of the MBN. Also may have to delete EGR as well, but don't know for certain. |
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Central TX | I put one of these into the wiring harness on my 05,made a fricking beast out of it,550 plus an added 40hp from the diode,36 cents for one but you have to buy a package of them which will set you back at least $3,sounds crazy but it'll work,if I could keep my foot out if it,I could get 6 miles per gallon out if it,also put a Pittsburgh Power exhaust manifold on after the old one got pitted from being loose and full flow exhaust,take the wiring harness off the fuel filter housing and put resistor in the plug,tape it up and tape up the housing wire plug in,takes about 10 minutes to make a different truck out if it
Edited by Rb4430 1/10/2017 21:47
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SW Iowa | Well, how about some wiring directions? and resistance? |
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Central TX | The resistance is in the pic,u less it didn't show up on your end and instructions are in the post |
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SE MT | I was thinking the 04 was a bridge engine but couldn't remember for sure.
The bridge engines weren't bad in terms of reliability, they just had poor milage and poor power. Think of them as a de-nutted 6NZ motor.
I think in that year they only offered a 425 or 450 hp rating, with option to re-rate to 475. Never saw one that dynod very well.
If it was me, I'd think about finding a 6NZ ECM and injectors and swapping them out. Pistons/turbo might be a little different, but wouldn't worry about it too much.
Or, you could just take it in, have it re-rated to highest hp rating, and give her a shot to see how it does?
The bridge engine was Cat's half hearted try to meet emissions by offering a de-tuned engine to satisfy the EPA regs in 04 until the Acert engine could be released.
For the record, there was NO EGR in the bridge engine, or The acert BXS or MXS serial numbers. CAT was one of the last ones to put EGR on their engines because they knew how disastrous it was for them. |
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Central ND | We have 3 MBN engines, haven't had any trouble with them and they pull fine, they won't keep up with our c16's but I would definitely buy the MBN before an acert |
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| PDI has told us because we have work with them on their heavy set up that the Accert engine is actually built better then the the 6NZ the crank is stronger and the head gasket is better because of the higher boost pressure that the accert makes over the 6nz but the actuators are the problem and fuel mileage we are getting 4.5 pulling 164,000 after a lot of work |
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W.C. Ohio | Have one truck that has the bxs twin turbo. Hated that truck for years. Low fuel mileage and no power. 4 year older 6nz would turn circles around it. Spent $2000 for a flash to the ecm. Wow. Whole different machine. Serious hp and 7/10 mpg gain. Have done accuator work twice in 755000 mi. |
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SE MT | who re-flashed it for you? Cat? |
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| I would guess not !! |
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Southern Pa. | hillfarmer - 1/11/2017 09:17
I would guess not !!
Why wouldn't they? Buddy of mine had a '04 bridge engine, the dealer reflashed it while it was still under warranty. Ran real good after the reflash. After it was out of warranty, he had Antrim Diesel tune it right. That thing was nearly unstoppable after Richard Price got his fingers on it!! |
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SE MT | we did re-flashes all the time for software updating, but occasionally we did re-rates and upped hp on trucks that were cleared for it. At that time a re-rate cost $500 plus labor |
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W.C. Ohio | No. PDI |
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04 C15 Cat?
