Some of the water has found its way past the rings and into the engine oil, and the next step is to drain the oil/water mixture from the engine. Make sure to get the very last drop out of the pan by pulling the sump plug at the bottom of the oil pan. If the engine has been operated with water in the oil, pull the filters, too.
Change the oil, run the engine for 10 to 15 minutes, and then repeat the process. With new oil and new filters run the engine for thirty minutes. Drain this oil, change the filters once again and except for a clean up, you're finished.
How do you tell if there is a bent rod? Larry says that if it is badly bent you will hear it knock. But it may only be slightly bent. If this is the case, you will only know by checking combustion. With the engine running loosen each injector fuel nut, one at a time. You will hear the engine go from a smooth to a rough idle as the cylinder is starved for fuel. If there is no change in sound (or smoothness) on one of the cylinders you have lack of combustion. If everything was okay before this probably means a bent rod. Running the engine this way for more than a few minutes will lead to even bigger problems (however, if you have a bad injector you'd get the same symptom. To double check the injector in question replace it with a spare. If you don't have a spare switch it with another injector.) If the problem is only a bad injector you can run until you can get them serviced. Do not run the engine with a bent rod!
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