Engine overhaul — general description (Skoda Favorit)

It is not always easy to determine whether an engine needs to be rebuilt, as it depends on many factors.

High mileage does not necessarily mean that an overhaul is necessary, and vice versa, low mileage does not eliminate the need for one. Regularity of maintenance is the most important factor to consider. An engine that has had regular oil and filter changes and other required maintenance performed will provide many thousands of kilometers of trouble-free service. Conversely, a poorly maintained engine may require an overhaul at very low mileage.

Excessive oil consumption indicates that the piston rings, valve stem seals and/or valve guides are damaged (however, the possibility of leaks should first be ruled out). Perform a compression test to determine the likely cause of excessive lubricant consumption.

Check the oil pressure by setting the measuring device to the working position of the oil pressure sensor and compare the obtained result with the data specified in Specifications. If this pressure is low, the main and connecting rod bearings and/or the oil pump are probably worn.

Loss of power, rough running, engine or valvetrain noise and high fuel consumption may also indicate that the engine needs to be overhauled, especially if all of these factors are present at the same time. If a full service does not resolve the problem, regrinding the worn components is the only solution.

An engine rebuild involves restoring all internal parts to new engine specifications. During a rebuild, cylinder liners, pistons, and piston rings are replaced. New main and connecting rod bearing liners are typically installed; if necessary, the crankshaft can be replaced or reground; in addition, the valves are serviced. During a major overhaul of the engine, components such as the starter and generator may also be overhauled.

Note: When rebuilding the engine, the coolant hoses, thermostat and water pump should be replaced. Carefully inspect the radiator to ensure that it is not clogged or leaking. It is also recommended to replace the oil pump.

Before you begin overhauling the engine, read the description of all the procedures and prepare everything you need. If you carefully follow all the instructions and prepare the necessary tools and equipment, the work will not cause any particular difficulties, although it may take a lot of time. Check the availability of the necessary spare parts. The main work can be done with ordinary tools, but precise measuring tools are needed to inspect the parts and determine whether they need to be replaced.

Note: Before deciding what repairs need to be performed, it is necessary to completely disassemble the engine and inspect all components (especially the cylinder block and crankshaft) The condition of these components is the main factor that determines whether the engine can be rebuilt or replaced with a rebuilt unit. Do not purchase parts or repair any components until you have made this decision.

To ensure maximum service life of your rebuilt engine, ensure impeccable cleanliness when assembling it.