CONROD FAILURE

CONROD - BENT

Bent con-rods are often missed when engine rebuilds are carried out due to the con- rod alignment not being checked as the correct equipment was not available. Con-rods bend most commonly due to hydraulic action caused by the induction of water. (Blown head gasket or driving through water above the air intake.) Severely bent con-rods should be replaced not re-aligned.

Foreign object forced between the piston crown and cylinder head is also a more obvious cause. (Broken ring, valve, valve seat or carburettor /air cleaner parts)

Minor bend can occur due to severe operating conditions. This will be evident by the unusual diagonal wear pattern on the big end bearings. Visual inspection is important at time of strip down to record which rod requires attention. Engine reconditioners can rectify minor bend damage by re-alignment.

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Bent Conrod due to hydraulic action