X15 Dual Element Oil Cooler Retrofit

[PTSCummins]

Talking to Rawze a while ago we determined that the old dual-element coolers found on the non emissions CM570s should fit in an X15. I ended up hunting one down and going through the process of rebuilding it and installing. The engine is in a 2019 T800 that does heavy haul in BC.

On average I'm 90-130k gross, most of it in 90+ degree temps on grades anywhere from 7-11%. Most of these pulls are 5-10 min long and managing oil temps has always been an issue.

Prior to the swap, when heavy, I would easily see 230ish running around town, and on a longer pull, it wasn't hard to push it into the 250 range, even with the engine fan locked on.

Even Rawze agrees that for heavy haul, the single factory cooler cores on the newest X15 series engines look like that they are just not quite big enough for heavy haul applications. These high oil temps on heavy applications are seen with 100% factory programming, and with very good custom programming that is specifically set to minimize internal friction to keep oil temps down.

Rawze has helped get started with tracking down all the genuine OEM parts needed, and asked me to make this post as a follow up so others can make these same changes to their oil cooler system if they want to. The parts listed were sourced from a factory 800HP K-series engine that was up-fit (by cummins themselves) for an extreme application, and has the same style of block opening.


(After the swap) ...
After the swap, I'm seeing around 210 in town. I've done everything I can to cook the oil on pulls, and oil temp now runs just like the older ISX engines that were built for aussie-style heavy haul. The coolant comes up and kicks the engine fan on long before the oil temp gets past 235, and with the fan locked on I haven't seen it go past 220. Oddly enough it seems to make a bit more oil pressure as well. On a pull it'll hold 41-42 PSI consistently.

The swap itself isn't that hard. There is only the headache of draining the coolant, pulling off the turbo, and the EGR cooler prior to getting the oil cooler out.

Here is the full parts list. This assumes you are completely rebuilding a used housing that already has a crossover tube. Note there is also a TSB indicating that the new cooler cores will require the use of orings between the core and crossover tube instead of gaskets. The crossover tube to housing connection however, still requires gaskets. Also note that all bolts holding the cooler to the housing are to be sealed with Loctite 2760 or similar to prevent leaking through the threads. The entire cooler assembly MUST be pressure tested prior to installing. I cannot stress this enough. It needs to hold 20PSI for 15min with no leakdown.

Oil cooler housing: 4952507 or 3681601
Oil cooler core (2): 4965870 or 2892304
Thermostat: 4952629
Vibration isolator (2): 3681906
Cooler crossover pipe base gasket (2): 4973532
Thermostat snap ring: 3411881
Thermostat plug oring: 3089025
Cooler core oring (2): 4966084
Turbo supply base oring: 3922794
Turbo supply ORF oring: 3679139
Bypass plunger oring: 3678606
Housing plug oring (3): 3678912
Oil cooler housing gasket: 3689755
Threaded plug for coolant side: 3678924
Coolant side plug oring: 3678925
Housing turbo coolant supply base oring: 3678786
Housing turbo coolant supply ORF ring: 3627695



To install:
Turbo oil drain gasket: 5264570
Egr return manifold oring: 3683607
Turbo coolant supply seal (2): 3963991
Turbo oil supply ORF ring: 3922794
Turbo coolant return ORF seal: 3922794
EGR return tube oring (2): 3683814
EGR Inlet tube oring (2): 3683814
Compressor inlet tube oring (2): 3692406

Tags:

ISX duel cooler, heavy haul coolers, dual element coolers

[Rawze]

I know that there is also an after-market duel element kit that is being sold out there by one of those big name, bad delete tuning companies.

At one point, I even helped PTSCummins look into this as an option as well. Sure they are a crap company, but maybe they are making a decent oil cooler kit solution? .. but nope ...

It was found that many people have had serious leakage issues with that kit. We also found out that it does not seem to work as well as the OEM solution listed above. - Cheaper, chineesuin copy-cat parts?... most likely.

This is also why I asked PTSCummins to make this article .. so that people that do heavy haul with newest ISX's can have an actual reliable solution instead.

[schISM]

Anyone interested in doing a swap like this give me a pm. Not gonna use this housing/tube and would let it go for a fair price.