I have a Cat 3126. It loses prime it seems like after sitting overnight in the cold. Replaced the check valve in the

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Customer: I have a Cat 3126. It loses prime it seems like after sitting overnight in the cold. Replaced the check valve in the back of the cylinder head. Thought I had it fixed. Today I went to start it and threw a fault 164-11. Same symptoms. Runs rough and kills out until it warms up a bit and then no problems at all. Only throws fault when it’s in the cold over night. Please help
JA: What is the complete model and serial number of your machine?
Customer: Cat 3126. Serial # bej10242
JA: Anything else you want the Equipment Mechanic to know before I connect you?
Customer: That’s should be it. Thanks
Answered by yellowman99 in 10 mins 3 years ago
Auto Mechanic

16,260 satisfied customers

Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs

Thanks for asking your question. I will try and help you out.
Sounds like the oil is leaking down from the heui system since it’s setting a 164-11 when frost started.
This is caused by two things.
First is a faulty injection actuation pressure control valve. I would change it first. Second is a faulty heui pump.Please reply back if you need more help. I am happy to assist.
Ok do you know where I can find a part # for the control valve
Just give your engine serial number to the local Cat dealer. They can get you a part number.
Ok I installed it. Parked it outside and going to let it sit for awhile to see if problem is fixed. Also I have a Cat 6.6 Acert engine that I have a very hard time starting in the cold. Block heater plugged in and glow plugs working but it will not fire When I roll it in the shop and let it warm up it will start and run all day. What could be causing it not to start in the cold?
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