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That I don’t know, haven’t had a valve off yet. I have extra valves and can look at them to see if they have recesses for o-rings on the back.

I just went through this fiasco, and my cooler was also 30 thousandths out. Had it lapped, so it's dead flat know. I installed the CAT pre-filter, my truck is C7 powered so not sure if that filter works on a 3126, and the gen II IFS post filter. Photos below showing how I modified the routing of...

If you unplug the injection actuation pressure sensor and then start the engine, the ECM will default to the required 870psi at idle. If all is well that way, you know the issue is the sensor. Don't try driving the truck with the sensor unplugged of course, it'll throw a bunch of codes.

Okay, this saga is behind me. The gasket that came in the kit I ordered is really nice and better than than the original paper only gasket in my opinion. Also installed the 175psi secondary relief valve. Removing the original relief valve was a royal pain in the a$$. Whoever installed it buried...

Do you guys recommend any type gasket sealant/adhesive on the unloader gasket?

Here's the unloader rebuild kit by itself for anyone interested. https://www.napaonline.com/en/p/MBIRNT26A

Yes, I bought a kit earlier this evening. I just made a gasket for this at the onset of the HEUI system rebuild and the pistons and springs all looked really good. Made the gasket out of cork hoping to fix a leak caused by a void in the casting, but obviously made it worse. The casting used for...

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.