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So I drove my car on Thursday and the oil light briefly came on and now I have knocking/tapping sound from the engine.
cant get hold of a garage as closed for Christmas does anybody know what it may be so I know what to expect ??
 

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What is mileage?
Is oil level Low?
Solid sounding knock or a lighter tapping?
Does sound change with engine speed?
I would not run the engine again until more investigation is done.

Last time that happened to me it was just before the conrod came through the side of the engine block on my Ford Consul.

What you describe does need looking at asap to rule out anything serious.

Edit.

Anyone?
Hydraulic tappets? would low oil level cause noisy tappets?
 

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The usual reason for failure is the oil pick up strainer in the sump gets blocked, the reason light comes on and the oil starvation causes the damage. If you have got away with only the crankshaft you have been lucky. This usually often results in a complete engine sieze which requires new engine. If the engine has been stripped showing it is only the crankshaft you may get away with new crank and bearings.
 
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