CM870 ECM AND TURBO PROBLEMS

[1693rattler]

Hello all,
I'm new to the forum, thanks Rawze for letting me join. I bought an 05 W900 Isx 450 cm870 from a buddy of mine. It was demandated before my buddy bought it. Classic case of bad work done to it in the past. Had water in the oil when I bought it. I've done a complete rebuild. Now I need some advise on getting the rest of the problems fixed. Original turbo has been replaced with a borg warner. No surprises he told me jake brake didnt work. Next problem is the ecm isn't the correct one for this engine. I didn't know that until I hooked up insite after I rebuilt it. The ecm is from an Isx 500, different cpl, a year older and roughly 43,000 serial numbers difference. I have no idea why the ecm was changed. My questions are what do I need to do about the turbo, keeping in mind I have none of the original components for a core charge or whatever. Next question is what do I need to do to get the proper programming in the ecm for my serial number and what I'm working with. I don't have much knowledge on ecms. Usually work on Cat, knock on wood I've never had an issue with a Cat ecm, other than changing trim codes after an injector change or recalibrating the timing after a rebuild or cam sensor replacement. Any advise to steer me in the right direction will be greatly appreciated!

[Rawze]

if the ecm is the same part# that the engine calls for, then it will be fine. It can be re-programmed.

as far as the turbo goes... put it back factory with the controller, and the VGT.

When it comes time to re-program it ... get with forum member 'running rough'. He specializes in the older CM870's particularly, and does proper programming work that has been reviewed by myself and others many times around here. Forum member 'Bangy88' has also been doing 870's lately too, and is another person that is trustworthy with the programming.

hopefully, it was inframed properly... here is what should have been done to it during the inframe. Anything less and it will not last long...
ref: http://rawze.com/forums/showthread.php?t...6#pid70606

[1693rattler]

Thanks Rawze. I'll check the ecm part numbers, replace the turbo and get with running rough. I actually ended up pulling the engine when I saw what bad shape it was in and rebuilt everything. I don't think anything wasn't leaking oil. Both cams had lobe damage and were replaced as well as the rockers. Reman oil pump, water pump, air compressor, injectors, oil cooler replaced and new damper. The block had to be cut and the liner protrusion was double checked before the head went on. New jake harness under valve cover, solenoids passed the ohm test but I did change the orings. I'm too deep in this project to not finish it right!! Thanks again.

[Rawze]

(12-26-2024 )1693rattler Wrote:  ... the liner protrusion was double checked before the head went on ...

Its an old block ... Heat stresses, heat cycling, and relief over time at the mid-stops needs to be compensated for by raising liners above factory levels ...

if you did not raise the liners to 0.014" or higher (max 0.016") ... and only left them at 0.010" - 0.011" after shims, couter-bore, etc... , then it will only live about 3-4 years and have head gasket issues, unless you turn it down to the 1750-trq range (or lower) so that it does not let go again. This is a mistake that just about everyone rebuilding them does these days, and then wonders why it did not hold together as long as it should have.

the link I posted above has all the info (not found in the manuals) needed to make it last another full million miles again ... at 1850+ trq (minus any abuse) ... everything said in that post is important.

so ... if you had them set back at ... 0.010" - 0.011" ... then have the programming turned down to 485HP, 1750trq .. and be thankful you found this info, and curse yourself out for not doing more research, instead of cursing that engine out in another 3-4 years due to having to dump another $$20k+ in it again. Do not say you were not warned.

[1693rattler]

I watched your videos on you tube before I started this project and yes sir, we raised them to .014. I had the guys at the machine shop that cut the block for me watch your video before they counter bored the block. I also rechecked the head torque after it sat overnight when I put it together. I'll have it tuned to 485HP and 1750 trq just to be safe. Its in a daycab, 100 mile radius and flat midwest roads. Don't need bunch of HP, longevity is more important to me