Engine overhauling

An overhauled engine is an engine which has been removed, disassembled, cleaned, inspected, repaired as necessary and tested using factory service manual & approved procedures. The procedure generally involves honing, new piston rings, bearings, gaskets, oil seals, etc. When done by a competent engine builder the engine will perform as new. The engine may be overhauled to 'new limits' or 'service limits' or a combination of the existing parts, new genuine OEM parts or new after-market parts. The engine's previous operating history is maintained and it is returned with zero hours since major overhaul.

Many times OEM part manufacturers supplies their OEM parts to major engine manufacturers (e.g. Ishino manufactures both the OEM and the aftermarket cylinder head and valve cover gaskets for the Nissan VG30E. Often the Nissan logo is imprinted on the OEM part while the OEM suppliers brand will be imprinted on the same exact part when offered aftermarket.)

A top overhaul only covers the replacement of components inside the cylinder head without removing the engine from the vehicle, such as valve and rocker arm replacement. It may or may not include a valve job. A major overhaul however covers the whole engine assembly, which requires the engine to be removed from the vehicle and transferred to an engine stand in our units repairs shop. An overhauled engine refers to a major overhaul. By comparison, a major overhaul costs more than a top overhaul.

CARS specializes in Top overhaul and Major over haul of various engine.