I also lost injector #2 years ago. My mechanic fixed it with a Helio-coil. After two years, I found the #2 injector bolt had loosened again. #4 injector looks good, clean, and is a pain to work on- so we are going to leave it alone for now. We've already pulled and cleaned injectors 1, 2, and 3. Tomorrow, my mechanic is going to install studs for injectors 1, 2. & 3. We are using Dorman studs 675-338. They are about a half inch longer than the Jeep bolts.
https://www.oreillyauto.com/detail/c/do ... ag0/675338We will also apply blue loctite on the serrated nuts that will hold down the injector claws.
Ive dealt with 3 CRD libertys that have had major engine issues. Two engines were totaled.
I believe leaking or cracked heads have caused coolant leaks into cylinder 2 due to a head manufacturing defect or incorrect factory torque settings of the head bolts (which caused the head to crack)- meaning- I believe the torque settings FROM THE FACTORY are incorrect as the aluminum head flexes and cracks. I believe these torque settings have caused countless aluminum heads to fail. Then, I believe coolant slowly leaks into cylinders then blows the injector out while driving. It appears that a small amount of fluid can be expelled from the cylinder. But even this small amount of fluid seems to affect and loosen the injectors. A bit of history: sometimes, when I'd first start driving for the day, the engine would die with a hard stop while idling at a red light near my house. This happened often at the start of the day. Another fact: once or twice a month I found my low coolant light on and had to add coolant. Four months ago, I drove my CRD to my mechanic to change the glow plugs. He was busy. He parked it for a month. Upon changing the glow plugs he noticed lots of coolant in cylinder 2. We removed the coolant from the cylinder and started the CRD. Then we flushed the radiator and added a full 33.8 oz bottle of Bar's Leaks HEAD SEAL Blown Head Gasket Repair. We followed all directions. The coolant leaks appear to have stopped.
Hopefully, after installing the studs for the injectors, this will be a good vehicle. I will give an update if problems arise.