12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

I Am Completely Stumped Coolant Loss

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Old Apr 6, 2010 | 11:45 AM
  #11  
HAYMAFIA's Avatar
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check under your thermostat housing make sure the head gasket isnt blowing water out. ive had two blow there.
 
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Old Apr 6, 2010 | 08:46 PM
  #12  
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Look for a chalky trail somewhere along the block, head, t-stat housing...around a hose bung..

You sure you ain't burnin' it? It won't always show up in the oil and it won't always be visible in the exhaust...
 
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Old Apr 6, 2010 | 09:45 PM
  #13  
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well we pulled it in the shop at work again and we are almost positive it wasnt burnin any. my oil is fine. we threw some die in there and ran it for a while up at temp and didnt see die anywhere. filled it up and ran it for a while and i didnt really losse any. i was watchin the level and my thermostat opened and a bunch of coolant went out then it started fillin up but never filled all the way back to where it was before. so our best guess is that i have been flushin my coolant system a lot cus there was oil in it and im thinkin the loss im seeing is just coolant fillin back up everywhere. is that possible? and lets just say there was air in the system then wouldnt it loose pressure when i pressure tested it also?
 
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Old Apr 6, 2010 | 10:34 PM
  #14  
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did you check the freez plug on the back of the motor
 
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Old Apr 6, 2010 | 10:44 PM
  #15  
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ya i did and it was fine. i felt all around it and everything.
 
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Old Apr 6, 2010 | 11:35 PM
  #16  
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with rad cap on tight
put a t in the heater hose and hook a air hose to it at 10psi
let it cook overnight and you should have a trail somewhere
if not it will be hydo locked
pull the injectors and spin the engine over

ps don't stand inline with the injector side of the block
 
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Old Apr 7, 2010 | 12:08 AM
  #17  
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I just replaced my water pump and all i put some stop leak in my radiator and mine's still leaking pretty bad from some where. when i find my leak i'll let you know what it is maybe it'll help you out.
 
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Old Apr 7, 2010 | 08:12 AM
  #18  
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Originally Posted by zach_west
I just replaced my water pump and all i put some stop leak in my radiator and mine's still leaking pretty bad from some where. when i find my leak i'll let you know what it is maybe it'll help you out.

correct me if im wrong, but im pretty sure your not supposed to use stop leak in diesels??
 
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Old Apr 7, 2010 | 09:13 AM
  #19  
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nope. when i got my 96 someone put stop leak in it to slow the head gasket. 2 months later while doing the head gasket i noticed 3 of the water journals in the head were stopped up. 1 year later while rebuilding engine i purchased a new head because the old one was cracked. im sure the stopped up journals didnt help any.
 
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Old Apr 7, 2010 | 09:38 AM
  #20  
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you shoulda told dad that michael. cuz he was the one who told me to do it
 
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