Detroit 12.7 care and maintenance
06-13-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #1
Detroit 12.7 care and maintenance
just recently bought an international with a 12.7 detroit and I'm wondering what kind of things I need to be on the lookout for. Its got an overhaul and a bunch of other new parts. Seems to be a really solid truck. Just looking for some info on maintenance and how to get the best longevity and fuel mileage out of it. Thanks everyone stay safe.
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06-13-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #2
RE: Detroit 12.7 care and maintenance
(06-13-2020 )Izzyrod52 Wrote:  just recently bought an international with a 12.7 detroit and I'm wondering what kind of things I need to be on the lookout for. Its got an overhaul and a bunch of other new parts. Seems to be a really solid truck. Just looking for some info on maintenance and how to get the best longevity and fuel mileage out of it. Thanks everyone stay safe.

How about a year and model of the truck? Mileage, etc...
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06-13-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #3
RE: Detroit 12.7 care and maintenance
2001 International 9400 1.1 on the chassis and 50k on the overhaul. New AC New shocks New tie rod and tie rod ends new tires all the way new radiator new gaskets and hoses. Thats about all I can remember right now.
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 Thanks given by: Waterloo
06-13-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #4
RE: Detroit 12.7 care and maintenance
Run the overhead, it is about that time after the in frame. Other than that, just regular maintenance. Use some gear lube when you change the oil. Turbo boost gauge and Pyrometer/EGT gauge, install if you do not already have them.

I would check the driveline, the u-joints in particular. Make sure they take grease and are not loosey goosey. I would go over the electrical system too, start at the battery box, inspect the cables, if they look like the original cables, may be something to replace before winter, they get green and loose efficiency. Same with the headlight wiring, old wiring, the lights will not work that great. Starter too... If original I would replace.

I would go over the rear suspension too, check the bushings and torque rods.

Fifth wheel, if original, I would replace.

Others will chime in, sounds like a good truck. Take care of it, and it will take care of you.
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 Thanks given by: Izzyrod52
06-13-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #5
RE: Detroit 12.7 care and maintenance
Sounds good. Also has new u joints and fifth wheel. Torque arms and electrical is sound. Also brand new LED headlights and wiring harness. All seems to be really great. Any ideas on oil change intervals? I'm new to detroit. I've only run isx and cat thus far.
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06-14-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #6
RE: Detroit 12.7 care and maintenance
Good deal, sounds like my truck, LOL! Run it like you would an ISX. I would keep the rpm's up, don't lug her and the same with the oil change intervals depending on how it is driven/conditions, change every 10,000 to 18,000 miles, I would run regular old Rotella truck stop service bay oil in her, no Lucas or any of that crap.

Honestly, you have a truck you put the key in and drive, there is little to no drama with what you have compared to this EPA crap we have. You sir have a truck that requires no wet nursing, pretty much turn the key and go, like it used to be out here.

Back in the day, a maintenance fund consisted of oil change money and a case of grease... I miss those days. Every couple of years throw on a set of tires and a brake job...

One thing to watch for on that International is the wire that runs from the battery to the ECM, make sure that is in good shape and not rubbing on anything. It is a 14 or 16 ga wire, with an in line fuse in it, running directly from one of the positive posts on one of the batteries in your battery box directly to the ECM, that is what powers it, and if it breaks or gets old, it will shut you down in a second. That is something I would really check out, something I would replace just for peace of mind if there is any question regarding the condition of the wire and or fuse or fuse holder. It is a pretty easy job if it needs to be replaced, in your driveway, not on the side of the road or sitting in the middle of the highway. ;-)

Enjoy that ride, sounds like you got a winner!
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 Thanks given by: Izzyrod52
06-14-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #7
RE: Detroit 12.7 care and maintenance
Have you read "My Book". The link is near top. You will find good info.


User's Signature: It's hard to win an argument with a smart person, but it's damn near impossible to win an argument with a stupid person
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 Thanks given by: Rawze , Izzyrod52
06-14-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #8
RE: Detroit 12.7 care and maintenance
Well, I can tell you that probably all the brake valves have been neglected and probably ALL need replaced. The brakes will get spongey. Also the tredle valve is a very neglected part under the brake pedal.

Check the trailer pigtail connection in the driver side box. The wiring corrodes under the rubber grommet inside the cab. Causing all kinds of lighting and weird wiring problems. Including ignition back feeding and light and dash coming on with the key out and fuses pulled.

Being a 60 series you'll want to watch the main ECM harness that goes around the back of the block. They are well known to rub the wires through at the back corners of the engine (more the drivers side but can happen on both side). Also 60 series are well known to break the valve rocker buttons and cages off under the valve cover. Get used to pulling the valve cover when you hear it ticking. You'll be replacing them enough to get good at doing it. Yes even the upgraded ones come apart.

If your cab suspension is needing repair, International sells the entire bolt in suspension unit for about the price of piecing them out and it waaaay easier to replace that way.

The rear axle torsion bars may look good but if the rubber is showing signs of weakness or wear then just replace them. They cause a lot of axle movement and funny drive tire wear. Along with wheel bearings for proper torque and keep good condition shocks on it. They are fantastic suspensions vehicles until they aren't. Then they chew things up quick.

The year you have had a problem with the way the clutch pedal shaft goes through the firewall. It would literally break apart and the small shaft that goes through would bind, not allowing the pedal to be pushed in. Checked it to make sure its in good condition or has been properly repaired. Its a crap job to do but is necessary.

Watch dumping the hood over and letting the hood slam open. Its tied to the top of the radiator and will crack and break the AC condensor, CAC and even the Radiator. Those hood helper springs can be found from Dorman. They are way cheaper than International and last just as long.

Check your firewall starter solenoid on the passenger side. If you're starter is in good shape but the ignition clicks with out turning over, your problem is more than likely there. Don't go cheap buy the good International brand solenoid. All the other ones are exactly that. Cheap crap and fail constantly even right out the box.

Have your drive shafts take down and spin balanced. You'd be surprised the night and day difference in properly balanced straight shafts. They'll easily give you 500k problem free miles including input and output shaft seals and the actual rears themselves get longevity.

Seal up the battery box to keep dirt and dust out. These trucks love to corrode batteries. And like Waterloo said those ECM feed wires rub anywhere all up along the driverside frame rail. Any hints of a problem and just cut off what you can see and run new wires all the way up.

Watch your AC compressor mounting bolts. Detroit did make a good upgraded mounting bracket and your may have it but if it has the old late 90's style then it will come loose and the bolts will wear through the front gear case.

If it was over hauled, did they do the front bull gear in the gear case? If not you'll definitely want to do this. It will absolutely be a ticking time bomb to destroying the engine if hasn't been replaced yet.

I'm sure there's more but this is quite a list. They are great trucks. And you can consistently get 7+ and 8's mpg all day long if you learn to drive them correctly. Read about hypermiling techniques on here and you get good tips. Stay off the car sites to learn about it. They're completley retarded about all of it)

And yes, I worked on these trucks for a few years and then I own and drive 2006 9400i for 5+ years now. There is nothing I haven't torn apart on them.
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 Thanks given by: Izzyrod52 , Waterloo
06-14-2020, (Subject: Detroit 12.7 care and maintenance ) 
Post: #9
RE: Detroit 12.7 care and maintenance
Sounds good fellas. I appreciate it very much. I'll keep looking into the different quirks
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