Crankshaft ZZ90237 Perkins NM, aftermarket

Crankshaft ZZ90237 is an aftermarket part for the Perkins 1104 (NM) engine. The card also lists 10000-48967, 359-0715.

The crankshaft turns the reciprocating motion of the pistons into rotation and passes torque to the flywheel, front pulley and gear train. In a four-cylinder engine it runs on five main journals, with the rods on four crankpins. Scored or oval journals, a spun bearing, low oil pressure and knocking under load call for regrinding or replacement. A cracked or bent shaft can only be replaced. The photo shows a shaft with four crankpins and five main journals. Oil passages drilled through the crankshaft carry oil from the main journals to the crankpins; swarf or dirt in them soon ruins the bearings. If the repair followed a spun bearing, the block oil passages, oil cooler and oil pump are also cleaned or replaced, or metal particles will reach the new shaft and bearings. The front end carries the pulley and gear, the rear end the flywheel flange. The shaft is forged steel with hardened journals. The shaft is balanced.

Specifications

Compatibility

The part is listed for machines with Perkins engines. ZZ90237 is the crankshaft number for Perkins 1104 series engines. Other parts are in Perkins engine.

Fitting

Coat the journals with assembly lube; once the shaft is in place, turn it by hand to check it rotates freely. Line up the gears by their timing marks. Blow the oil passages through with compressed air before fitting the shaft.