a top end overhaul

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JACEK1

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Hello again!

Does "the engine needs to undergo a top end overhaul" mean "the engine needs to undergo a very extensive/expensive overhaul"?

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probus

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No.

A top end overhaul is much less than a full overhaul. It does not involve pistons, cylinders or crankshaft. You will be overhauling everything above the top of the cylinders: valves and their seats, valve lifters, gasket etc. I am 100% sure about this, having paid for the overhaul of hundreds of diesel engines.
 
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