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Okay, found the leak, and it's a biggy. Anyone know where I can get gasket #5? Not opposed to buying the whole kit, but there are a bunch of variants and it isn't clear which one is correct. Also, put a gauge on the wet tank and the compressor is definitely unloading, but it cycles every 50...

Yes, it's another reason I did it.

I took it apart to today and everything looked really good. I put a quick coupling on the wet tank, so I could easily connect a gauge there.

Thanks, ordering now. You can definitely see that the secondary relief valve has been blowing off, but the primary is releasing more frequently than it used to as well. It seems like the compressor isn't unloading.

Is this the correct valve? https://www.haldex.com/en/na/valves/pressure-relief-valves/pressure-relief-valves/kn31527-93fe3396/

Awesome, thanks GD! I have a service kit for the air dryer and need to get that done too, so I'll order up the relief valve and get both done at the same time.

Pull your Injection actuation sensor and stick a flexy magnet into the HEUI oil galley. If there is metal on the magnet, it's HEUI pump time.

Well, all I will say here, is that the CAT prefilter is just about keeping unfiltered oil out of the HEUI pump, it's obviously much more sensitive to that than the engine itself. So I don't see it as something where if it has contaminates in it the engine is Ef'ed anyway, and as you say, having...

My truck started doing something that sounds very similar to this yesterday. When I put my foot in it, the purge valve on the air dryer starts going off in rapid fire. It seems to also be behaving a little oddly at idle as well, and when I shut the truck off, there was air bleeding off under the...

The oil cooler housing bolts are M8 but regardless, the bolts themselves absolutely have the clamping force to pull the oil cooler down flat. The issue however is that all of the bolts are around the perimeter of the oil cooler housing, so you are relying on the rigidity of the cast aluminum oil...

Yea, I'm not talking about the spacer plate, it has absolutely nothing to do with this issue. I'm talking about the short direction across the flat surface of the oil cooler, photo below. The center section is where the two dividers are that separate filtered from unfiltered oil. My cooler was...

I'm planning to do a detailed write on this, but I'll give you the abbreviated version here. One of the main causes of HEUI pump failures in 3126 and C7 engines is the oil cooler/oil filter housing. The main issue is that the oil cooler gasket surface that the oil filter housing seals against...

I can pretty much guaranty they didn’t.

Thanks guys. I just finished a complete cosmetic restoration my C7 along with addressing the several issues detailed in the CAT media letter regarding the HEUI system, so it's fully bombproofed now. I'm going to do a post regarding what I found, what was done to correct what was found and then...

I need to give the either starting system on my A1R some love. Haven't dedicated any time to it yet, so no idea if it is functional or not. Anyone have a good source for the canisters and the plastic tubing? The canister was missing and the tubing was cut when I got the truck.

HPS has quality silicon hoses for pretty much everything except the pre-formed lower hose from the trans cooler to the radiator. The temp spec on their hose exceeds the mil spec by 50 degrees on the top end.

I’m not using a lubricant additive, although at one point I had asked about that on the forum. I drive my truck regularly. Letting them sit for extended periods, like the military did with my truck, isn’t good. People complain about how unreliable the Pacbrakes are, say they get stuck closed...

Empire CAT in Reno had them new.

I would use them if they were the new injectors that superseded the original ones. The originals were apparently problematic, and from what I have read, the newer injector, among other changes, has screens to prevent debris from a failed HUEI pump taking out the injectors.

Does anyone have a CAT OEM parts source that is good to deal with? My local dealer here in Kalifornia is Peterson CAT and they never answer their phone and don't call back if you leave a message. I sat on hold for the parts department for over an hour on one call and on three calls selected the...