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Yeah you're going to have a real fun time trying to find the A1R cans. I would go to an air brake shop and show them what you have and see if they can match something up. Unfortunately, outside the military, wedge brakes have become a thing of the past and are considered dinosaur tech. The...

I would spend a week and clean every electrical connection and all the grounds. There's probably 100 of them that should be inspected and addressed. Not just from age - the manufacturer didn't really clean the paint well on many of them. I've seen a 2v drop between the cab and the frame on a 2...

Here's the Amsoil postage pre-paid kit. There's definitely other options out there but I get a few dollars off as a stocking dealer at my shop. https://www.amsoil.com/p/oil-analyzers-test-kit-ups-pre-paid-oaiuppkit/?srsltid=AfmBOooR3PxeY_SYGoyIvIYV8n3ZJyQBSKMOt7hULmZmN6uw8ep8byk5

Ah! Funny you should ask. I'm about to do an analysis and actually take the results seriously. So this is how it's been on my truck: Got the truck with 2,750 miles. Seller had just changed the oil with Rotella T4 and I drove it home 2,700 miles where it promptly had an air compressor failure...

I would probably replace those if I could get them. Finding replacements is the trick. If you can, get the upgraded A1R/A1P2 cans. Larger diaphragms. They brake AWESOME.

Holy crap! That's much worse than what I've pulled apart so far (not done with all wheels yet) on my 2008. But all my seals were trash and I was beginning to have similar issues creeping in.

I have the same filter but yet to install. Might do it on the passenger side. Personally I run Amsoil 15w40 Signature Series diesel oil. And oil changes are guided by analysis.

The HEUI actuation pressure sensor is located in the cylinder head HEUI oil passage and if the filter system was some kind of restriction to flow it would cause a fault on the ECM as it tries to control pressure through the HEUI injection actuation pressure control solenoid on the HEUI pump...

As with all engines - the main engine oil filter is not full flow. It is bypass filtration. So under MANY conditions the engine is already getting unfiltered oil. If the oil is cold, especially at high RPM (see ECO hub discussions), and if the filter element is partially plugged. If the...

Ah yes - obviously there is going to be a spectrum of warpage to coolers. Which could also explain why you have so many miles on your truck *without* having experienced a HEUI pump issue, and necessarily both of the trucks that I've been party to pulling apart DID have HEUI pump problems -...

It's spread out all over the diagrams. Here's the engine side of the 3126B: Both connectors (J1 and J2), share the same 70 pin numbering. This is looking at the back of the chassis side - so as if you are staring at the allen bolt that retains the connector to the ECM: The chassis side...

It IS a 3126B. That's all the military used in our trucks (besides the 3116 and C7 of course) CAT is often confused with military serial numbers and in any case it doesn't really matter. The chassis side pinout is the same and I believe pretty much the same on the C7 as well. Since all 3126's...

Interesting findings! I'm concerned that CAT doesn't seem to agree in the NHTSA documents I linked to above. It clearly shows checking with a straightedge and if light is visible then the implied conclusion is "bad". Additionally when we had them decked in both cases it was very obvious...

How did you end up getting the cooler flat? Pics of the gasket failure? Between the clean/dirty halves of the cooler? BTW - this is often overlooked on the 3126B since it's not covered in the NHTSA docs on this this subject. The docs only reference C7 and C9 engines because the docs are from...

Which engine? If it's a 3126B, check the jumper harness that the military installed to delete the deprecated EMI filter box near the ECM. The chassis side connectors and the jumper harness itself are prone to water intrusion and anytime I see these I delete them entirely. Cut out the chassis...

I tried anerobic sealer years ago for a bunch of applications. It was less reliable in some situations. But worse, the cleanup on it is horrible in my experience. If you want a "high tech" sealant, I would recommend Hylomar. But it's unnecessary. Permatex "The Right Stuff" works great. It's...

Small local auto parts store that has a machine shop. They have done two of them now. Chris knows the owner.

Sounds like a heat related electrical connection issue. How many grounds and starter connections have you cleaned? Have done a voltage drop test at the starter and aux solenoid while holding the start button? Any clicks from starter, aux solenoid, or PDP panel when you press the button?

You want an MLS (Multi-Layer Shim) style WITH a fire ring to prevent the exhaust gasses from working their way between the layers. If you want a really high quality (better than CAT) alternative, this is one option: https://www.ebay.com/itm/292272369494

Yeah looks right. Just not what they handed me. Probably you'll get the same thing I got. End of the day it's a standard T3 divided port turbo gasket. They are under every rock from a million suppliers.