A crack that propagates and spreads in a critical component such as a rod, main cap, crankshaft or cam can lead to fracture, part breakage and complete engine failure.Ĭhecking critical engine parts and castings is time well spent if it heads off a major problem that might result in a major engine issue or a warranty claim. It will continue to grow until eventually it causes a major problem like a combustion or coolant leak, an exhaust leak in an exhaust manifold or a vacuum or coolant leak in an intake manifold. Once a crack starts, it always gets worse. Parts should be checked for cracks after they have been cleaned, before they are machined, and in some cases a second time after they have been machined, repaired or partially assembled (after installing a new seat in a head, sleeves in a block, etc.).Ĭracks are bad news because they never heal themselves.
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