Excessive oil consumption may indicate that piston rings, valve seals or guide bushings require attention. However, make sure there are no other oil leaks before deciding that the rings or guides are worn. Check the compression in the engine cylinders or perform a leak test to determine the extent of the damage.
Loss of power, difficulty in handling, detonation or unusual engine noise, excessive valve noise and high fuel consumption may also indicate the need for a major overhaul, especially if all of these factors occur simultaneously. If a full range of adjustments does not help, a major overhaul is the only acceptable solution. An engine overhaul involves restoring the internal engine components to the performance of a new engine.
Caution: Always check the availability of necessary spare parts when planning a major overhaul. Ford dealers or a good engine repair specialist can help you overcome the lack of replacement parts if there is a problem.
During a major overhaul, piston rings are replaced and the engine is restored (turning or honing) cylinder walls; if the engine has been resurfaced at a car service center, new pistons and larger rings must also be installed in the engine - this work, of course, requires the availability of suitable replacement parts. Main bearings and big end bearings are usually replaced with new ones during a major overhaul. If necessary, the crankshaft can be re-ground to restore the journals. Typically, during a major engine overhaul, the valves are also serviced and restored, as by this time they are usually far from being in the best condition. During a major engine overhaul, other vehicle components such as the starter, generator, etc. may also be restored. As a result of a major engine overhaul, the engine should acquire the characteristics of a new one, which guarantees reliable operation for many thousands of kilometers.
Caution: During a major overhaul, critical cooling system components such as hoses, drive belt, thermostat and water pump must be replaced. Check the radiator thoroughly to make sure it is not clogged or leaking (see chapter 3). The oil pump is usually also replaced when the engine is overhauled.
Before starting a major engine overhaul, read the chapter in its entirety to familiarize yourself with the scope of work, necessary tools and spare parts. Overhauling an engine is not difficult, but it is time-consuming. Plan at least two weeks for repairs, especially if you need to purchase individual parts. Ensure that spare parts are in stock and that all necessary special tools and equipment have been received. Most work can be done with standard tools, but some precision measuring tools will be required. Typically, a repair shop will inspect the worn part and offer you repair and replacement options.
Caution: Inspect all engine components, especially the cylinder block and crankcase, before deciding which repairs should be referred to a specialist auto repair shop. Never purchase parts or perform repairs on other components until the cylinder block and crankcase have been thoroughly inspected. Remember that the cost of major repairs is determined over time, and installing worn or non-standard parts is usually not worth it.
In conclusion, we note that maximum performance and minimum problems from a rebuilt engine are guaranteed by careful assembly in a spotlessly clean atmosphere and with the utmost care.
[The text of the article was copied from the website: FordBook.ru]