Once the flushing process was complete, I used Fleetguard Cooling System Cleaner to clean the cooling system. The water that came out was still dark so I redid the flushing process another five times until the water coming out of the drains was almost clear. After that, I drained the water by removing the drain cocks, letting it flow directly into the bilge. When it was full, I ran the engine for 15 minutes. Once the old coolant was drained out of the engine, I refilled the heat exchanger tank with fresh water. To flush the engine I followed the instructions from the Detroit Diesel 92 engine manual. I was able to get that amount out from removing the two drain cocks as mentioned above. The Detroit Diesel 92 engine manual says the coolant capacity for this engine should be roughly 12 gallons. One was on the bottom of the oil cooler housing, and the other was on the bottom of the piping running down and aft from the inboard side of the heat exchanger. I removed the two shown in the picture above. There are multiple drain cocks on the engine, with some being easier to get to than others. To drain the coolant from the engine remove the filler cap on the top of the heat exchanger and then remove the drain cocks.
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