Ford Navistar VT(6.4L)V8 Crankshaft – OE 8C3Z6303A

Overview

This is a new Navistar VT(6.4L)V8 crankshaft listed for Ford applications, carrying OE references 8C3Z6303A. It suits rebuild and repair work on engines with damaged journals, thrust surfaces or a broken crank, and is supplied as a single unit.

Engine application

• Engine code: Navistar VT(6.4L)V8
• Listed for: Ford
• OE references: 8C3Z6303A

How this part fails

A crankshaft carries the connecting rods and converts their motion into rotation, so it runs on precision-ground journals inside replaceable bearing shells. It fails when oil pressure drops, clearances go out of spec or debris passes through the bearings. Typical symptoms are a deep knock under load, low oil pressure at idle, metallic debris in the oil and visibly scored or blued journals once the sump is off.

Specifications

Fitment checks before ordering

Do not order on vehicle model alone. Check the engine code plate reads Navistar VT(6.4L)V8, then match the OE number stamped or printed on your existing crankshaft against the references listed here.

Rebuild notes

A replacement crank should be checked against the block before assembly: main and big-end journal diameters, taper and ovality, thrust clearance and runout. New bearing shells matched to the measured journal size are required, and the oil ways should be cleaned and the rear seal replaced while access is open. Assembly lubricant, correct bolt torque and a plastigauge check on each journal are standard practice.

What is included

Supplied as one crankshaft. Bearings, seals, bolts and gaskets are not included unless stated, and a rebuild normally requires new main and big-end bearings matched to the journal size.

Availability and warranty

The listing does not publish a stock quantity, so availability is confirmed by the supplier at order rather than shown here. The current Alibaba listing quotes delivery by Dec 28. The manufacturer states a 1 year or 10,000 KM, whichever comes first warranty on this listing.