My engine was running like a dream when suddenly there was an ugly knock, sounds like a diesel engine, but prior to that my oil light and buzzer went of so I filled up the oil and took it for a test drive, but the light and buzzer going of again I checked the oil level and it was over full so i drained the oil until the level were right, when I started my car the engine had this knock in it.
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Re: knock in my engine
DO NOT DRIVE or run this car until you resolve this. Irreperable damage may already have been one, but if not, don't press your luck.
Sounds like you don't have any oil pressure, could be
oil pump bad (pretty rare unless you have 300K miles or more no regular oil changes) or
oil pickup screen plugged up, If you or someone didn't change the oil regularly this is likely
obstruction in oil line (very unlikely)
defective oil filter or pressure relief valve (pretty unlikely)
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The combustion process of a diesel is not the smooth burn and increase in pressure of a petrol engine but is virtually an explosion causing a sudden rise in cylinder pressure. This is the source of the typical diesel knock and is more pronounced in some engines and some injection systems, especially when accelerating. It can be scary for those unfamiliar.
Electronic control tends to soften the noise.
Knocking might be the result of a mechanical problem (piston, connecting rod bearings, etc.) but if these things have been eliminated other causes of excess knocking can be excessive injection timing advance, dribbling injectors, bad spray patterns...
Engine knocks are never a good sign - they signal the fact that some parts inside the engine have been used so much that they wobble in their supports. It's impossible to say that you need a new engine just by looking at the oil. Oil is just an indicator on how good the piston-cylinder seal is, if it's dirty the seal might be bad and in that case the engine need a major refit.
Simple test: replace the oil and run the engine for 500 miles; if after that the oil is black then you will know for sure.
A loud knocking sound could be a variety of things. On the top of the list is Bad connecting rod bearing and main bearings in the bottom end of the engine. Bad lifters may also be a problem. I had to burst your bubble but a loud noise in your engine, like you describe may be alot of pre-mature internal engine wear may be cause by lack of maintenance. You should have it check by a professional before you invest money into fixing it. Remember if the cost of the repairs exceeds that retail value of the vehicle. Its time for a new one. Good Luck