Join Date: Jun 2012
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Cat 3406B low oil pressure
Hi, new to the board and need help diagnosing an oil pressure problem with a CAT 3406B. Just did an in frame and while we cranked the motor over with the starter the gauge was showing 40+lbs of oil, after enabling the fuel system and firing it up for the first time the oil pressure dropped to about 15lbs at idle and 30 at high RPM's. Replaced the oil filter thinking that it was clogged but that didn't help the oil pressure come up any at all. Hooked up a 2nd pressure gauge which verified the low oil pressure readings.
Any ideas on how to correct the oil pressure issue? Before the in frame the oil pressure was great. The engine was overhauled due to high mileage and a broken piston. The oil pump was not replaced during the in frame.
I've read that if the jake brakes are hooked up incorrectly it will cause low oil pressure. Pretty sure we hooked those up right but how do we check to make sure they were installed correctly? The jakes seemed to be working properly when the truck went for its maiden voyage.
Thanks for the help!