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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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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