Michael, it has been 20 years since I had an injector out of a D179 but I recall having to clean out the hole with a battery terminal brush and compressed air, then cranked engine with hole open to blow all the bits out of cylinder. I believe there was a copper "O" ring on the nozzle. Looked on CIH parts and it shows: 717203R1 O-RING O-RING, injection nozzle sealing. The time that I had the 2 injectors out, I didn't have replacement "O" rings so just cleaned up old ones and re-used then. Install injector, tighten finger tight then tighten each nut 1/4 turn at a time until tight. Must keep injector in alignment. Use soapy water to check for leaks. Re-tighten after engine has been up to operating temp. I looked in my I&T manual for 684, D239 but same setup as D179 and the instructions for reinstall is clean hole & torque nuts to 18 ft-lbs. They do caution to drain coolant incase the injector nozzle sleeve comes out and allows coolant into cylinder.
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