Pressure in radiator & into overflow tank?? - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 01-25-2012, 08:43 PM   #1 (permalink)
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Pressure in radiator & into overflow tank??

Please help !!
My 90 7.3 IDI is building a lot of pressure in the radiator, past the cap and into the overflow tank? I can hear it blowing into the overflow tank. This happens within a couple of minutes of cold start. I'm afraid if I drive it, it will blow all my anti freeze out of the radiator. I noticed that for the last couple of weeks I have been adding about a gallon of coolant about every three days? Would it do any good to retorque the heads? Any help would be appreciated. Thanks.
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Old 01-25-2012, 09:24 PM   #2 (permalink)
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It might be head gasket failure, and if your getting that much pressure that fast, then a re torque isn't gonna help. I would do a pressure test of the cooling system first. If it passed that test then there is a test kit that detects exhaust gas in the coolant.


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Old 01-26-2012, 07:33 AM   #3 (permalink)
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Markofcobra i am having the same problem and i replaced the rad cap with a ford 16 lbs rad cap($9).it fixed the antifreeze to overflow problem but now my rad hoses looks like they are ready to blow! Chuckster could a bad t-stat cause this?
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Old 01-26-2012, 07:39 AM   #4 (permalink)
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I suppose anything is possible, but I kind of doubt it. How old are the hoses? Have you removed the cap and then started the truck and watch for bubbles?
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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Old 01-26-2012, 08:38 AM   #5 (permalink)
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no i never checked for "bubbles".are they from exaust getting into the antifreeze? im waiting to see what "MARKOFCOBRA" has found out about his truck since this is his thread.
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Old 01-26-2012, 08:57 AM   #6 (permalink)
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Yes, if combustion gases are getting into the coolant it will add pressure to the system. There is a test kit that you can get, but you have to use a different fluid with diesel engines. IIRC you can get it at Napa.


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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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