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No sludge but I would get a bit of rust colored gunk out of the rad drain each time. That was same with all three both before and after the change. At the change over I flushed and ran them on hose water several times until it drained colorless and clean then I emptied everything I could get...

Red. Used the brand recommended by the local heavy engine shop as what they would run in that truck/motor. I will try to look up in my records exactly what brand. Ken

All three were m939 A1 trucks with the 250. I can come back with brands in the morning. Ken

One has been torn down, the liner did not eat all the way through but the pitting did extend under the first o-ring and we confirmed it was leaking past the rings. All of the rings were very swollen and sticky but the liner also showed signs of heat damage. Not sure if it was heat or...

Lots of talk of changing out the coolant on the NHC 250 because of liner failure. Well I have done that with three different motors so far and I just lost the third one today. If it was on your to-do list just put it off for a bit. I am at 100% failure the year after making the switch, all...

It has always bothered me how much my motor rattled until pressure came up. I also start the thing a dozen times a day or more and I have felt that has to be hard on it. One shop I consulted with about my string of blown motors also thought those could be related to how often I start it, they...

I wish you were closer. Not too hard to swap the 6CTA8.3 for the NHC250 I assume? Ken

Using the oil cooler port I can raise 10-15psi on a mech gauge screwed into a block port down by the starter in about 30 seconds after previously filling the engine two hrs prior (other testing before using the gauge). Cold oil, 50F ambient temps. When pump is off pressure bleeds down to zero...

So nearly done. Something wrong with my either start electrics so just jumpering and pumping it into a catch can. Don't want to add a switch to the dash if I don't have to so will try and troubleshoot tomorrow . Going to try oil cooler port just because it is easy. Had an issue where the pump...

My original prototype was an accumulator, pull out of one block port with a check valve, 24V solenoid to inject into another. After mocking it up it just seems simpler to use a pump especially since I wanted to filter the oil before putting it back. I am going to tap into the either start...

No it is DOT hose it is just modern DOT hose, just your generic brake air lines. They are however thicker. I have one apart I will go and measure thickness, could be I am crazy. The new stuff was was 7500 thousandths, the old line I pulled apart was about 7100 thousandths. I don't see that...

So it bothered me that I might have this wrong so I just went out and test fit my splices on the line I carry and pulled a few of the truck's air fittings apart to look inside. They fit perfectly, just like I remembered. Nothing on my truck has inserts either in the lines or built into the...

I haven't had an issue with sealing but then I have only used them once or twice. The line I carry is thicker than the stuff on the truck, that might be why but then it has all held when I needed it. Worrying about DOT rating on the fitting you are splicing the broken ends of a crispy line...

I was quite sure I couldn't pull oil past/through the pump and had to grab it elsewhere. I was in bed last night before I remembered why I wasn't worried about backflowing the filter, I do not think you could get any flow in reverse through the motor's pump. Same deal with grabbing oil...

IDK man when the 855 has been sitting you can hear the difference in sound when it builds pressure, the clatter and knock goes away. The idea of knocking crap in the passages loose is frightening. I have flushed some before and didn't find anything but still. Maybe that is a mark in favor of...

I am not sure I am dropping the kind of pressure needed to rip a filter apart with my pump, I was figuring however on some oil backflowing the main filter and I didn't view it as an issue, it would just get filtered again. I run NAPA and Fleetguard filters, might have to cut one open and see if...

I pull oil from the pan, push it through a small car oil filter and inject it into the motor. Redundant check valves to prevent backflow. It will even prevent oil leaking out of the pan if god-forbid the lines were ripped off. Like I said, it is a clever system. Are you willing to share more...

I have been running mine with aluminum foil for a while now. Cut a 2 inch wide strip and wrapped it around the joint a few times and then put the v-band clamp carefully over the top of that. Truck passed it's annual inspection like that. Someday I will do it properly so I hope you find a...

I was asked the other day what I carry in the way of spare parts. The answer is not much. Bunch of tools, grease, a gallon or two of oil, more tools, one wheel bearing and seal set, tools, jack, brake diaphragms, generic wire, tools, electrical splices and some other tools. All pretty...