Cat C15 1,100k miles pressure started buld up in cooling system

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ymalish, Jun 30, 2014.

  1. ymalish

    ymalish Bobtail Member

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    Jun 29, 2014
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    Have Cat C15 on 2003 Columbia and 1,100 m on it runs great 6.9-7.5mpg,and it started build up pressure in cooling system,I have had to add in 500m 1-2 gal of antifr.did check in shop using dark blue stuff putting in place of cap,see if gas from broken head gasket would change to yellow and it did not.Replaced also air compressor,still does.Don,t know what to do,need input from you guys.No water in oil.No oil in water.
     
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  3. maggard359

    maggard359 Medium Load Member

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    Nov 20, 2013
    Florida
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    How did you determine pressure? Could be a bad cap letting antifreeze back out overflow. The bad cap should hold pressure until 10-15psi whatever freightliner is set at. Hope it's that simple.
     
    ymalish Thanks this.
  4. ymalish

    ymalish Bobtail Member

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    Jun 29, 2014
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    Thanks for reply.I did replaced cap.after driving 15-20 m got back in shop and easy to see pressure more than 15 but cap looks like locked up unless you start open it to dump pressure.before it was pressure just little,and antifreeze was at level all the time.
     
  5. maggard359

    maggard359 Medium Load Member

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    You can't see antifreeze leak anywhere?
     
    ymalish Thanks this.
  6. ymalish

    ymalish Bobtail Member

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    Jun 29, 2014
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    thats the problem dont see any where leak but it some how goes out or may be in.when engine started no white or any smoke,i,m not sure but looks to me it goes out trough relieve valve on cap,not gas but antifreeze it self.
     
  7. maggard359

    maggard359 Medium Load Member

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    Next time you rolling pull off leave truck running and stick your hand over exhaust pipe. Do a sniff test, you can smell it if it's burning it. The antifreeze is going somewhere. Oil fill cap will look milky if it's mixing with oil. Probably burning it through exhaust if you can't find leak.
     
    ymalish Thanks this.
  8. ymalish

    ymalish Bobtail Member

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    Jun 29, 2014
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    I will do that tomorrow,oil is clean,antifreeze is clean from oil.on idling it does not build pressure.checked in shop with special dark blue liquid on top of surge tank,if gases in present,should become yellow,but it does not change color. My 1st reaction on it was broken head gasket even engine was never overheated/i,m o/o and no body was driving my truck from new.and it happened before like-2years ago I replaced head gasket and put new plate on,resurfaced head it self...
     
  9. country29

    country29 Medium Load Member

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    Feb 27, 2010
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    could be liner height bad, head gasket blown, cavitation in block or liners. if its never been inframed I would bet on liner height bad or cavitated block or liners.
     
    ymalish Thanks this.
  10. Truck Smarter

    Truck Smarter Bobtail Member

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    Jun 26, 2014
    Dallas, Texas
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    With those kinds of miles my bet would be on liner height. Seems a pretty common problem on high mile engines.
    I posted someplace else about it but- you can have the top of the block cut for shims without removing the engine from the truck. My preference on height is .005 but everyone has a different favorite. Cut all 6 holes install a new spacer plate and surface the head if it needs it. You should be good to go. Of course you will have the liners out of the block so really no sense in doing this unless you are doing and inframe.
     
    ymalish Thanks this.
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