CAT C12 specs/repair manual?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by MIg25, Jun 4, 2020.

  1. MIg25

    MIg25 Bobtail Member

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    Apr 10, 2020
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    Does anybody with a manual knows the torque specs for the thermostat housing etc on a C12? I am about to replace the thermostat on my C12 or as they call it Temperature regulator aka thermostat.
    Thanks.
     
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  3. PE_T

    PE_T Road Train Member

    I don’t have a CAT engine, but I’ve gotten my manuals from a site called MyPowerManual. There were cheap. I see there are 2 or maybe 3 manuals, depending on your engine serial number. But before you buy anything, try to find them online for free.

    Aside from the engine manuals, there might be a manual from your truck manufacturer. Try to find that one online too.

    The last method for getting torque specs is to use bolt torque spec charts. Now, this requires to be able to determine the bolt grade/strength, thread diameter, and thread pitch. It’s confusing to learn about these things at first, but with the help of YouTube you can master it. You’ll want to buy a manual caliper (or a good quality digital one) and also some thread pitch gauges for both standard and metric.
     
    Last edited: Jun 6, 2020
  4. A5¢

    A5¢ Medium Load Member

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    Oct 30, 2017
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    1/4" -- 9 ft lbs (+or- 2)
    5/16" -- 18 ft lbs (+or- 4)
    3/8" -- 35 ft lbs (+or- 7)
    7/16" -- 50 ft lbs (+or- 11)
    1/2" -- 75 ft lbs (+or- 15)
    9/16" -- 120 ft lbs (+or-22
    I did a little work on my C-15 and needed the manual for it. I found a CD on eBay and it was a digital version of the hardcopy. It has all of the torque specs, part numbers and disassembly/assembly instructions, with illustrations. I do not recall the name of the place I bought it from, but do a search and I am sure it will be out there.
     
    PE_T Thanks this.
  5. AModelCat

    AModelCat Road Train Member

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    I mentioned in another thread but CAT generally doesn't list a spec for every single fastner on everything they build. If CAT doesn't list a torque spec in the procedure or under "specifications" or "special instruction" its generally understood that the fastner is torqued by size/grade according to the bolt torque chart.

    In all honesty, I rarely break out the torque wrench unless its for something critical like main/rod caps, exhaust manifold, head bolts etc.
     
    PE_T, StrokerTSi and A5¢ Thank this.
  6. PE_T

    PE_T Road Train Member

    I compared the torque spec list you posted for standard bolts, and they appear to match grade 8 (strength) bolts with the thread pitch number on the higher side. Personally, I’d go a little lower than the torque spec numbers on the chart below. It’s coming from a Cascadia workshop manual. The three charts are for standard size lubricated and unlubricated threads and also metric size lubricated threads.
     

    Attached Files:

  7. AModelCat

    AModelCat Road Train Member

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    Some food for thought:

    When a torque spec says "X" lb-ft plus/minus "Y" lb-ft, set it to the number given as the plus/minus is a margin of error for torque wrench accuracy.
     
    PE_T Thanks this.
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