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Just another day in paradise

Discussion in 'Shop Talk' started by Mike L, Feb 25, 2015.

  1. Mike L

    Mike L Senior Member

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    It did maintain pressure. Did I miss something?
     
  2. Bluox

    Bluox Senior Member

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    Just a thought from the past.
    Kinda weird to have a one way compression leak.
    Some trucks had an air operated heater water control valve that if it leaked it would blow water out of the radiator.
    Bob
     
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  3. Mike L

    Mike L Senior Member

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    The truck is a 2007 peterbilt 379 so no air operated heater valve. Your post got me thinking. I guess I’ve never paid much attention to the thought of a one way compression leak. Way back when I worked at a truck dealership we would use the pressure tester and if it built pressure quickly we’d rule out the compressor and then off with her head! I did see one time a guy was pushing coolant and had an overhaul done. Continued to push coolant. That’s when someone noticed the weep hole on the water pump was plugged.
     
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  4. kshansen

    kshansen Senior Member

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    Not really directly related to this problem but figure it might help some here. Many years back had a coolant leak getting into the oil of a V16-71 Detroit. Yes I bet everyone says injector tube orings, NOPE! Checked all 16 not a drop. Dropped pan to see if I could spot where on the engine the water was going while putting 15 psi pressure into radiator. Not a sign of a drip. Believe I also had pulled engine oil coolers and tested them with no leaks.

    Well end of day and they didn't want me to work overtime so I went home for the night. Next morning walk into shop to see a large puddle of coolant. What the heck? Now could see drips coming from under engine near front cover. Like Mike's engine turns out this one had a plugged weep hole and a bad water pump seal that for some reason only leaked when no pressure on it but as soon as you put pressure on the cooling system to look for leaks it stopped leaking!
     
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  5. John C.

    John C. Senior Member

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    They swell up when warm and retract when they are cooled off. I helped a young up and coming wrench on one of those this summer.
     
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  6. Bluox

    Bluox Senior Member

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    I guess I may be confused but how would a plugged witness hole put 15 PSI in a cooling system?
    Bob
     
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  7. hosspuller

    hosspuller Senior Member

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    I would guess... without any air in the system, a small volume could build pressure quickly. Sorta like a skid steer attachment in the Sun, builds hose pressure to prevent connecting to the machine.
     
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  8. Bluox

    Bluox Senior Member

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    Your kidding right?
    Bob
     
  9. kshansen

    kshansen Senior Member

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    I have never had that problem, but actually never had to deal too much with quick connects on hydraulics. I can see that if say you had a cylinder bottomed out and disconnected the couplers on a cold day then came back a day latter in the afternoon with the sun beating down on the cylinder it could build up a good amount of pressure.
     
  10. Truck Shop

    Truck Shop Senior Member

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    That happens when I eat radishes.:)
     
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  11. hosspuller

    hosspuller Senior Member

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    Nope ... try it yourself.. Water & oil are essentially incompressible
     
  12. Bluox

    Bluox Senior Member

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    Apparently you don't understand what a witness hole is Or how a water pump works.
    Bob
     
  13. Mike L

    Mike L Senior Member

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    A5D8E4CA-5B50-4820-869C-7764FA627EB2.jpeg 4254E558-9ECF-4869-A871-7001266B2352.jpeg Started tearing into my buddies truck today. A platinum kit for a cat was 8-9 weeks out. A long block was 2-3 days out. Considerable more money but when he’s done he’ll have a nice rig. Now here’s where I’m going to start complaining. All the rockers and vva’s are installed, and marked with a paint marker so they’ve been torqued. I have to swap the injectors from the old engine. So that means I have to remove all rockers and vva housings. Wtf? Engine also comes without a new oil pump. Why? Nobody in their right mind is reusing an old pump on a brand new engine. We have to swap all the filter housings, oil cooler, thermostat, on and on. Not one single o-ring or gasket included so he’s placed another large order just to get enough parts to continue.
     
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  14. Mike L

    Mike L Senior Member

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    Stopped at a customers farm on the way home to put a shut off solenoid on a case loader. Found this beauty sitting in the shop. I wanted to swap my labor on the loader for it but couldn’t make a deal. B259B299-2E76-4204-83D4-FE3E756ED61F.jpeg
     
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  15. JLarson

    JLarson Senior Member

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    You act like this is an oversight instead of a design o_O
     
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  16. Mike L

    Mike L Senior Member

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    I don’t know why I’m surprised but in my head the engine should come with everything necessary to complete the job even if it’s more money. Common sense is not so common I guess.
     
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  17. JLarson

    JLarson Senior Member

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    Not in the parts department, it's actually strictly forbidden. Lol
     
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  18. Truck Shop

    Truck Shop Senior Member

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    Pretty normal on a long block. Years back Engines didn't come with jakes-it was a option.
    When I worked for a shop in Seattle years ago, it was the distributor for Pacbrake. We would
    trade out weeks and one of us would go to Kenworth plant and install up to 6 sets of jakes
    in a night on B model Cats. I know I installed my fair share, or so it seemed. Now it's just
    standard that jakes come on new engines.

    Long blocks normally don't include the outer accessories, other wise it would be a complete assembly.
     
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  19. Mike L

    Mike L Senior Member

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    Tied up the engine swap today. It took two of us 35 hours start to finish. Removed engine and transmission, swapped over all parts, new clutch, flywheel turned, new turbos, etc. Of course that had a few extra parts runs included. Truck runs excellent like it should. Test drove it and lo and behold the alternator quit on us. Thinking it maybe got hit with the pressure washer before we started. Now I got a few smaller jobs to do and next Monday I’ll start overhauling a C18 in a Peterson chipper.
     
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  20. JPV

    JPV Senior Member

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    How many hours on the C-18? I have heard they only make it about 5 or 6000 hours in a chipper. We work with an outfit that has 3 Morbark chippers, 2 have C-18s and 1 has a k series Cummins. The Cummins was recently overhauled with unknown hours on it, both Cats are approaching 6000. They just bought a brand new complete engine for 60,000 dollars to have a spare on hand for when one goes.