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Old 09-20-2011, 01:11 PM   #1 (permalink)
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CAT C7 Acert swap??

Anyone ever done this on a third gen? I deal with CAT all the time at work and my local dealer is looking for a C7 for me. My cummins is blowing 1.5 quarts of oil out the blow by between fillups and the price to rebuild the thing (with mods of course) is about $7k. It seems to run fine and doesn't smoke and I don't think its burning oil its just pushing oil vapor out the vent, but its not "right" What could I expect to get for a running ISB motor with blow by if I sold it? Anyone know of any resources to swap a C7 in one of these trucks. Its an option on the F550 so it can't be that much bigger of a motor...

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Old 09-20-2011, 02:21 PM   #2 (permalink)
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Swap sounds like an awesome project but ur gonna be solo on it cause I don't think any one has done it. Selling that truck with an engine that needs rebuild expect half blue book or less. If its just blowing out the rebuild could be cheap compared to a swap. Personally id look into the rebuild more cause that swap could hit 10 grand pretty easy id think.

Read it wrong haha just the motor with blow by expect to get around 2000 to 3500 depending if u sell everything with it as in turbo injectors cp3 filter canister just all of it. Or just block and head. Issue is with blow by no one buying knows if its a 7k build or a 2k fix. Also to sell it other than locally might have to go lower cause of shipping cost to convince some one to buy it.
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Old 09-20-2011, 02:29 PM   #3 (permalink)
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How much you looking to get for your motor with blow by?
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Old 09-20-2011, 03:29 PM   #4 (permalink)
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1760 lbs, CRUNCH

48" L X 36" H, l birth canal isn't large enough for new kid.
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Old 09-20-2011, 03:33 PM   #5 (permalink)
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yea that sounds like a headache for the front end. These front ends have a hard enough time with the 1100 they have to deal with now
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Old 09-20-2011, 03:41 PM   #6 (permalink)
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Yea that's heavy. Air ride? Sounds like a high dollar project
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Old 09-20-2011, 04:40 PM   #7 (permalink)
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Those are available on a F650 and 750, not a 550. Different animal entirely
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Old 09-20-2011, 05:37 PM   #8 (permalink)
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well maybe it isn't such a good idea... I work in the marine industry and have a good relationship with CAT and am more familiar with their engines. I don't see to many Cummins motors simply because we don't deal with too much under 1000 BHP. It comes down to working on what you know. I've never been inside a Cummins but have been involved with the CAT stuff from ecm files to blocks. And having resources to do anything to the motor sure is nice. All this blind troubleshooting I've been doing with my Cummins is aggravating. I'm used to be able to plug in to do cylinder cutouts, pull egt's adjust fuel maps, etc... to diagnose and solve problems, and all I can do on my cummins is look at it. Sure all the mechanical stuff is similar and taking things apart is the same but with the common rail technology there is so much that you can do troubleshooting with the electronic side that I dont' have with the Cummins.

My CaT dealer is still looking for a reman C7 Acert for me and I'll price it out but it would be a ton of work. I figured if I do go to $9 or $10k on the project I could sell the cummins and offset the cost difference. But the trans to bellhousing interference might get interesting, I might be able to keep the radiator and intercooler, the C7 would be stand along and have its own ECM and its all J1939 anyway so I could plug in to the rest of the truck or use the CAT MPD for gauges. Frame modifications at the mounts would be required but not a major set back. Oil pan height above the front diff might be a problem, and I didn't think about the extra 650 pounds on the front end and the balance on the truck. At this points its a game of research. I'll have to pull the cad models of both the 6bt and the C7 and see what sort of interference correlation I can see between them. To bad I don't have any CAD on the truck... Any idea what SAE bellhousing these cummins engines have?

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Old 09-20-2011, 05:43 PM   #9 (permalink)
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Sure all the mechanical stuff is similar and taking things apart is the same but with the common rail technology there is so much that you can do troubleshooting with the electronic side that I dont' have with the Cummins.
I dont understand why you dont have this with the cummins besides the fact you dont have the scan tool?
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Old 09-20-2011, 06:09 PM   #10 (permalink)
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you may be right. I don't know what the scan tool is capable of. The CAT electronic technician software can monitor every parameter as well as change any electronically controlled interface. Some of which (such as fuel settings) requires specific serial number and date encrypted passwords from CAT engineering, but the diagnostic tools and data logging are hard to live without once you get used to using them. I suppose I could buy a scan tool for the cummins or even talk with our cummins distributor and see if I could buy a license of the cummins software for a laptop to achieve the same principal.
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Old 09-20-2011, 09:03 PM   #11 (permalink)
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your truck electronics will never interface to the CAT.
with stock dash electronics.
won't have speedo
won't have tach
won't have engine temp
won't have oil pressure

think whole new gauge and interface system. find a wrecked F650 with the C7, Allison and all truck electronics. year or 2 later, you may be driving a CAT powered Dodge RAM, then again probably not.

ABS will never work
forget an '06 or newer with CAN buss, nothing will ever work.

rebuild what you got, dance with what you brung.
block and crank are most likely good, they seldom go tits up in an injector melt down.
may be lucky and just need 1 new slug and a rebore.
these parent bore blocks are simple, easy and low priced to dry sleeve if cyl. wall is damaged beyond 1mm overbore.
$15,000 max for everything with a 1mm overbore on all holes for extra displacement, coated pistons so you aren't so likely to melt it down again, 2 micron commercial fuel filters, Smarty, big cam, twin turbos and she'll rape any C7 on the hills.
Will make CATs cry and piss in their exhausts
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Old 09-20-2011, 10:06 PM   #12 (permalink)
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^^^^^^^^^^^^^^^ done! ^^^^^^^
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