Garage411: Engine Overhaul - cleaning, cylinder head, pistons, rods, crankshaft and more

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Engine Overhaul - cleaning, cylinder head, pistons, rods, crankshaft and more

General Auto Repair

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Examples used in this article are general in nature and do not necessarily relate to a specific engine or system. Illustrations and procedures have been chosen to guide mechanic through engine overhaul process. Descriptions of processes of cleaning, inspection, assembly and machine shop service are included. Always refer to appropriate engine overhaul article in the engines section for complete overhaul procedures and specs for the specific vehicle being repaired.

ENGINE IDENTIFICATION

Engine may be identified from Vehicle Identification Number (VIN) stamped on a metal tab. Metal tab may be located in different locations depending on manufacturer. Engine identification number or serial number is located on cylinder block. Location varies with each manufacturer.

INSPECTION SERVICE PROCEDURES

Engine components must be inspected to meet manufacturer's specifications and tolerances during overhaul. Proper dimensions and tolerances must be met to obtain proper performance and maximum engine life. Micrometers, depth gauges and dial indicator are used for checking tolerances during engine overhaul. Magnaflux, Magnaglo, dye-check, ultrasonic and x-ray inspection procedures are used for parts inspection.

Checking for damaged engine parts

CLEANING PROCEDURES

All components of an engine do not have the same cleaning requirements. Physical methods include bead blasting and manual removal. Chemical methods include solvent blast, solvent tank, hot tank, cold tank and steam cleaning of components.

Cleaning procedures explained