Before you start any engine rebuild, You have to figure out why the engine failed so the repaired engine (or replacement engine) won’t suffer the same fate.
The usual reasons for an engine work are loss of compression, excessive oil consumption, or excessive oil clearances.
There are some frequently seen signs that a engine rebuild may be necessary.
The most common sign is oil consumption and excessive white smoke in the exhaust, especially when the engine is cold.
This is normally a sign of worn piston rings.
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Begin your engine buildup list by identifying what good parts you already have, such as a cylinder block, a crankshaft and rods. Then, decide what parts you’re going to need new, such as a camshaft, lifters, bearings, gaskets and so on.
Carefully weigh the cost and hassle between refurbishing stock items and buying new parts. For example, with today’s aftermarket offerings, it may be easier and more cost-effective to buy new cylinder heads rather than rebuilding the old units.
Every engine needs oil between its moving parts not only to reduce friction but also to carry away heat. So any reduction in oil flow may cause these parts to run hot, gall and seize.
Low oil pressure is often a contributing factor in engine failures. The underlying cause may be a worn oil pump and/or excessive clearances in the main and rod bearings as a result of high mileage wear or neglect (not changing the oil and filter often enough).
Oil starvation is almost always fatal to any engine, and is usually the result of a failed oil pump, a plugged oil pickup screen inside the oil pan, or a low oil level.
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