Macktech689

The 4-5 blink code is pretty a common problem, there are several things that will cause it both electrical or mechanical. Finding the failure mode identifier is the first thing I would do, you will need to use Mack diagnostic software to determine the FMI.

The fuse in F10 also supplies the diagnostic connector, If anything like a electronic logbook system is using that connector and the fuse blows again check that system out.

What did you find?

The fuse in F10 is a 5 amp, the CB post relay is in CB 28. Check the fuse and swap in a different relay, do your power outlets still work?,

Check fuse in F10, also could be a faulty relay for the CB posts, all are in the same fuse block

The fuses are located under the triangle shaped panel in the center of the dash on top, a fuse location diagram is in the plastic bag stuck under the panel. If the diagram is missing you are looking for a 15 amp fuse in location F9. Engine overheating wont cause electrical problems just a coincidence

Would be best to know what the failure mode of the faults is, unfortunately will need to use Mack diagnostic software to find that out. That will determine if the problem is electrical or mechanical. I wouldn't start replacing stuff until you know the failure mode

Depending on which unit pump fault is active the problem could be low fuel pressure. A faulty fuel pressure regulator or fuel supply pump will cause unit pump faults and white smoke and missfiring.

No special procedure, take it for a ride and check for leaks and recheck the oil level.

Sure does, stuff like that doesn't break sitting overnight. Maybe he didn't want to work on a saturday, just kidding!

Before you pull it out, check the bolt at the yoke if its loose replace it and see what it does. Its also possible the bolt in the range fork has come loose that will also cause problems. Has the range shift been grinding or disengaging recently?

PTT 2.0 will work on trucks with a 9 pin round DLC, need to use a 9 pin cable from the VOCOM box.

I would expect to see 6-3,6-4 or 6-5 all are datalink faults, let us know what you come up with.

Woukd be very helpful to know what the blink codes are, use the speed control buttons to retrieve the codes.

Is the malfunction light on?

If your diagnostic tool cant communicate check the fuse and power supply to the engine control module.

The best way to check your compressor is to remove the inlet and discharge hoses from the compressor head and feel the air. If still no air pumping from the outlet check that the fitting isn't plugged with carbon, if the fitting is clear feel the inlet if no air is moving there the drive coupler has failed. If it feels like more air is being pushed out of the inlet than being drawn in the unloader in the head is stuck open.

More than 1 way to skin a cat. whatever works!

Use as few bolts as possible, usually 2 close to each end of the engine and you won't have any problems.

make your brackets up using the cylinder head bolts to hold them down.

Cyl. liner cavitation usually takes years to develop and poor coolant, Peteguys engine has around 8500 miles on it.

There's not any info around about engine load calculation, all that has been mentioned previously is correct. Also add boost pressure, turbo wheel speed, and turbo nozzle position. The readings you stated sound right, if no power or missfire problems dont be concerned these engines constantly learn and adjust themselves to maintain proper performance.

I was thinking he was looking at the CCV outlet tube but didn't want to assume. Smoke there is not good, indicates a cylinder problem. I have repaired 2 low mileage MP-7 engines this year with cylinder failures due to faulty piston cooling pressure sensors. No smoke at the tube but steam from coolant in the oil from cracked liners'

Not familiar with the term casing vent, can you be more specific or add a picture ot the component.

No, but he is really creepy!!!