2004 Hyundai Elantra Repair Question
Loud knocking sound
Hi I would have to say the cheapest route will be used motor. See here is the problem if the rod bearings are bad then also the crankshaft is bad and most likely a rod or piston as welll. unfortuneately none of this is known until you have spent the labor to take it apart . so used will be cheaper
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Replacing the bearings can be done at home but rebuilding the engine would be another matter.
Wrong diagnosis can be a waste of money so get an expert opinion to confirm it is the bearings that are noisy, or it could be from the valve trains etc.
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