Interesting things to come?

So I caught a bug and was off work this last week, come in to work today and find out the service manager quit on Saturday. I'm not sure how this is going to shake out... It's too bad really, I liked working for Jeff.

This is from some time back but I don't think I ever posted it, driver put 70 gallons of gasoline in a truck with a DD13 Detroit. He filled up in Burlington and made it to about Lake Samish.

A little bit of a voltage drop happened here, enough to let the smoke out of the connector. This is the sleeper A/C wiring, you can see the burn mark on the insulation pad, could have burned the truck down. The fuse did not blow...

Something I learned this summer, air disk brakes make changing a wheel seal at the Bow hill scales into a lot more work. Caliper bracket bolts that get torqued to around 400 ft-lbs don't just come right out.

Also, I think the engineers that designed the Kenworth T2000 must have all been fired and gone to work for Navistar... The A/C system wiring is well, not good. There are 3 connectors at the dash controls, they are all the same connector, they are not labeled, the wire numbering is not the same as the diagram, the connectors are not directional so they can be plugged in upside down. They will act very very strange when plugged in upside down... It's just a nightmare to troubleshoot if someone doesn't put it together right. The first time me and another tech spent hours trying to figure out what was going on. The second time I caught on to it a little quicker, I may make diagram of how it is supposed to be if I work on another one.

ABS codes and more

Something interesting I learned this past week. With a Bendix ABS system a sensor open code will self clear, however a sensor short to ground code will stay active regardless of the detected condition after the code sets initially.

One week I had two '07 DT466's with the exact same issue in the shop, cylinder #2 high to low side open fault, low power, and smoke on acceleration. Pulled the valve cover and found that the injector connector was not plugged in fully, I suspect it was never fully latched and eventually the latch fatigued allowing the connector to back out. Now on the second truck when I plugged the #2 injector in a partial miss started on cylinder #6, cutout the injector on #6 and it responded but the rpm drop was not as much as the other cylinders. Fuel delivery pressure was 1 psi below spec, pulled the filter and found metal shavings in the housing. Replaced the lift pump and the problem was resolved.

Went out on a road call to a farm recently, an automated transmission locked into neutral. Plugged in with Eaton Service Ranger and it had an active electronic clutch actuator communication fault, I cleared the fault after checking power and ground to the actuator. I was able to drive the truck about 1/2 a mile before it set a mechanical system not responding fault for the ECA and shifted itself back into neutral. After having the truck towed back to the shop I finished the troubleshooting and we ended up replacing the ECA.

Rebuilt the pump on a water tanker for one of our customers.

2015

Haven't had a chance to update this in awhile, I've been busy working and oem training has taken up most of my free time. Here's some of my projects since I last posted.

International with a 466E, would not restart after being parked at a customers loading dock. This fuse is not blown but has a 2v drop across it, that is enough to keep the engine from starting because it is in the clean power harness which supplies the injector driver module and it has a minimum operating voltage.

After attending a four day International A/C training class in Chicago I have become the A/C tech in the shop it seems. Had an interesting problem with a IH 4300, the complaint was intermittent A/C operation at speeds over 60 mph. Two of our other techs had already worked on it and not repaired the issue... I road tested the truck and found that after 14 miles at 60 mph the A/C would indeed quit cooling until road speed came down below 35 mph, no codes present. Watching live data while it occurred lead me to replacing the compressor clutch, All readings normal, compressor clutch draw steady at 3.7 amps, however after 14 miles the high side pressure dropped down to static levels while the computer said the clutch was engaged. Backprobed the connector and test drove with a meter rigged to verify that the clutch had 12v power and ground. Turns out the issue had nothing to do with road speed but operating at over 2000 rpm overloaded the weak compressor clutch and it would eventually kick out. Installed a new compressor assembly and the problem was resolved.

This is another A/C problem, 2013 with less than 7,000 miles used as a lime spreader. Found that the evaporator was completely plugged even with the factory cabin filter and an aftermarket HVAC intake filtration system. The problem is that operator was running on recirculate mode and the recirculation filters are the old wire mesh type and can't filter out the lime/dust that enters the cab. Also they did not seal the factory fresh air intake well enough so the add on filter wasn't actually doing any filtering even if he did run on fresh air mode as it should have been.

Got my CDL this spring and just finished up my ASE certifications.

Road call out for a liftgate, operator error combined with a broken chain resulted in breaking the eye off the end of the fold cylinder. I was able to weld the broken piece back into the eye so the driver could finish his route.

Adjusting the engine brake on a Maxxforce after resealing the valve cover base under warranty. The truck actually came in for a check engine light which ended up being a dead short to ground in the EGR valve resulting in EGR and intake throttle valve faults as they share a power supply.

Replaced an automated engine controller on a generator, It was shutting the engine down for an overspeed condition without an overspeed input. The overspeed input is adjustable and based on the generator frequency output.