Gjctc Diesel Tech

Getting the 217 remounted in the combine. It turned out that this thing running so badly was mainly due to a leaking intake manifold leaning out cylinders 5&6. It was easier to pull the engine than squeeze in behind the grain tank to repair it 🙂

It feels good to see 2 projects leave .......and even better when it's 2 at once 🤣

We finally fired up the 7800 today after a long winters hiatus of not being able to work in the tent. I can say I am VERY impressed at the attention to detail the groups of students working showed connecting many hydraulic lines to perform a frame split. Upon startup there was one very small leak from a cooler line. That's dang good for high school kids.

We also tested the park lock, the main reason for the teardown. Sitting the edge of the tire on an 8x8 block in both directions resulted in the tractor holding, MUCH better than before.

Also apologies to everyone that had to listen to that 6076 Deere engine rev about a dozen times. Honestly I can't blame them, they sound good 🤣

Some Q Plus brake shoe installation, and demonstrating the chain install method 🙂

Sometimes I worry I may scare students by giving them crappy tasks. Hooking up all the hydraulic lines under the floorboard of the Deere 7800 may count as one of those tasks 🤣🤣

This Timberjack transfer case has been a good learning experience on how to remove, replace and adjust bearings. I believe there are 16 bearings in this sucker. It would be finished as of today if Mr. F didn't mistakenly tell the students to put the shifter forks in backwards 🤣

I wish I had the time to do a whole class on this troubleshooting case study.......but I just had to happen at 1:30 on a Friday afternoon😠😠

The story: A student brought their 08 F150 in to repair a broken serpentine belt. Pretty straightforward ....get the utility knife out, cut the belt wrapped around the fan clutch (remember this for later), remove the shroud, fan clutch, and replace the tensioner.

The students get it back together and it runs like P**P. Hmmmm. Go to check codes and 11 codes the return immediately. Hmmmmm. At Diesel Tech we are pretty unlucky .......but not that unlucky.

Thankfully the student paid attention and verified that it was about 15 minutes after he realized the belt was failing this symptom happened.

Now, do we attack codes, run in circles and panic or quit for the day?

Take a breath, and think what happened recently that could affect so much. Hmmmm, that belt wrapped around the electronic viscous fan clutch seems suspicious. Also a common power supply or grounding issue will typically cause that many codes at once.

A quick trip to All data and a wiring schematic shows a power supply to the viscous fan. Following it back, we see numerous in harness splices going off to the many components we have codes for.

Replace the 15 amp .......bingo and the student is off to enjoy their weekend.

Electrical is hard to teach, but hopefully examples like this can help people to take time to think BEFORE panicking 🙂

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This Lucas design starter is only about 2 years old. It's been having issues needing "tapped" to be started. This is a perfect example to students what a high amperage draw does to starters in a short time, essentially burning the solenoid contacts and the commutator.

Pretty sure if we power wash this radiator........nothing will be left 🤣🤣