A leaking nozzle will knock like crazy, so easy to check because you just have to pull the lines off nozzles,(commonly refered to as injectors) crank engine over a few times and observe. Good ones will not push any compression out at all, shot one will shoot right out and worn ones may push a little out, and you don't have to bleed anything, just screw them nuts back on. Have seen many drop the pintle from nozzle tip which can give you both a fuel knock and a mechanical knock from it becoming imbedded in top of piston. Be interested to see what you find, could be any of suggested remedies.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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