rlchv70

FYI, for those with access to the International system, they have a cleaning kit for their 11 and 13L engines. Might want to check it out.

I think it is the compressor. Spun it last night by hand and it was very easy to spin.

No codes.

Some additional info: High side and low side pressure are identical even with compressor commanded on. Leak tested entire system with a sniffer. Replaced schrader valve on high side, but issue still persists. I don't remember what the pressure reading was. I'll have to check my notes and reply back. It was higher than the spec for the given ambient temp.

Working on my personal vehicle in my garage. Not a technician by trade, just a backyard mechanic. Limited experience with A/C systems. A/C doesn't work. A/C clutch won't come on. If I command on with scan tool, it will work. However, still doesn't blow cold. I attached gauge manifold. Has plenty of low side pressure. However, high side pressure is identical to low side pressure, even with compressor on. Scan tool shows pressure sensor reads accurately. Thoughts and ideas? Thanks.

The feed hose should now be available by itself without the tube.

??? v8 has been standard in buses for a long time.

The cracks actually start at the exhaust seat. There's not really any place for them to propagate to, so they don't hurt anything.

I've said this before, but I'll say it again. The warranty numbers on 6.4L are on par with the 7.3L. You guys see all the problems. For every broken 6.4 that you see, there are hundreds without problems.

Also remember that hot gas contains fewer molecules. If you have higher EGR temps, that means higher intake manifold temps. That means fewer molecules are being sucked into the cylinder. Fewer air molecules means that the fuel molecules have less oxygen atoms to grab onto when they burn. That results in more unburned/partially burned particles - soot.

I don't recommend that you use this cooler. The main reason to cool EGR is to reduce the amount of soot produced for the given amount of EGR. This cooler will not cool as effectively as a factory cooler, and it may actually flow more EGR. Therefore, soot output will increase if you use this cooler. It can lead to extra soot in the oil, extra deposits on pistons, and extra soot out the exhaust. Therefore, this cooler is likely no longer emissions compliant. If you are going to modify the engine for "off road" usage (wink wink), then you'd be better off doing an EGR delete or block off.

Data that I have shows that cam/lifter failures are exacerbated by certain driving conditions. Certain bus applications are particularly susceptible.

It's more an issue of low coolant pressure than air. At lower coolant pressures, cavitation occurs earlier.

Yes, the amount of urea injection will vary based on the load and quantity of NOx present. The SCR catalyst doesn't work well when cold. Therefore, it should not be injecting urea until a certain temperature threshold is present. The SCR catalyst is not 100% efficient, its closer to 60% efficient. That is why EGR is still needed. Also, since the SCR doesn't work when cold, the engine will rely on EGR to control NOx under those conditions.

I have access to the data, but I can't post it. Sorry.