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.
Cat C15 1,100k miles pressure started buld up in cooling system
Discussion in 'Trucks [ Eighteen Wheelers ]' started by ymalish, Jun 30, 2014.
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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. -
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.
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You can't see antifreeze leak anywhere?
ymalish Thanks this. -
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.
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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. -
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...
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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. -
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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