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Current version by: Michael ,

Text:

Start by presurizing the system and verify no external leaks if not I would suggest modifying a water bottle so your coolant overflow hose will slide in through the cap snugly leaving about an inch between the hose end and the bottom of the bottle fill the bottle 3/4 full of water and run the truck through a heat cycle starting cold all the way to fan on temp 212 or so changing engine speeds from idle to high idle observe the bottle watch for a steady constant stream of bubbles if you do see the bubbles you most likely have a head gasket problem or top liner seal issue PS do this test with a new radiator cap installed
== Update ==
 
I wouldn't say as a rule you would see it in the oil. It is very possible to just get compression in the cooling system which would push the coolant out the overflow. Since the 3406 family of engines use a complex block to head seal consisting of a steel gasket a spacer plate a standard style head gasket a series of rubber coolant and oil seals and rubber upper liner seals symptoms can vary. Cat also had some problems with liner protrusion being inadequate allowing liners to move causing all kinds of good stuff. By all means start simple change the rad cap drain and check air tanks for coolant any aux systems with coolant ie Tri PAC fuel fired coolant heaters fuel tank heaters trans oil(water cooled models) etc. a bottle test is cheap and easy if nothing shows up

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Edit by: Michael ,

Text:

Start by presurizing the system and verify no external leaks if not I would suggest modifying a water bottle so your coolant overflow hose will slide in through the cap snugly leaving about an inch between the hose end and the bottom of the bottle fill the bottle 3/4 full of water and run the truck through a heat cycle starting cold all the way to fan on temp 212 or so changing engine speeds from idle to high idle observe the bottle watch for a steady constant stream of bubbles if you do see the bubbles you most likely have a head gasket problem or top liner seal issue PS do this test with a new radiator cap installed
Start by presurizing the system and verify no external leaks if not I would suggest modifying a water bottle so your coolant overflow hose will slide in through the cap snugly leaving about an inch between the hose end and the bottom of the bottle fill the bottle 3/4 full of water and run the truck through a heat cycle starting cold all the way to fan on temp 212 or so changing engine speeds from idle to high idle observe the bottle watch for a steady constant stream of bubbles if you do see the bubbles you most likely have a head gasket problem or top liner seal issue PS do this test with a new radiator cap installed

Status:

open

Original post by: Michael ,

Text:

Start by presurizing the system and verify no external leaks if not I would suggest modifying a water bottle so your coolant overflow hose will slide in through the cap snugly leaving about an inch between the hose end and the bottom of the bottle fill the bottle 3/4 full of water and run the truck through a heat cycle starting cold all the way to fan on temp 212 or so changing engine speeds from idle to high idle observe the bottle watch for a steady constant stream of bubbles if you do see the bubbles you most likely have a head gasket problem or top liner seal issue

Status:

open