CAT 3116 to much pressure in cooling ...

CAT 3116 to much pressure in cooling system

Posted in the Caterpillar Forum


United States

#1 Mar 5, 2013
I need help. I have a 3116 in a 1996 Topkick Rollback. I am getting a lot of pressure out of the radiator. As soon as you start the truck it gushes water out of the cap if it is off or out of the overflow line like a fountain. This just started from 1 day to the next. Never ran hot just started up one day and started blowing. I have already changed the cap, and sent the head to the machine shop to be redone completly and still the same problem. Any ideas welcome.

Mumbai, India

#2 Mar 5, 2013
Hi Mike,'
Check your water pump,there could be a impeller failure.

United States

#3 Mar 6, 2013
Thats what I thought also but I took the belt off the water pump and it gave me the same problem?

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#4 Mar 7, 2013
Mike wrote:
Thats what I thought also but I took the belt off the water pump and it gave me the same problem?
It's caused by one of these.You have an injector cup that is cracked, or the cup o-rings have failed. Or, the head gasket has failed. Worst case scenario, you have a crack in one of the cylinders, which would make the engine "junk"....the 3116 & 3126 don't have "removable" cylinder liners like the bigger Cats :(
David Butts

Dallas, TX

#6 Jul 11, 2014
You should check the thermostat and furnace parts, also the compressor is needed to be clean as dirt on it results into the malfunctioning of complete system. For more details visit

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