2. High mileage does not necessarily mean a rebuild is necessary, and vice versa, low mileage does not eliminate the need for it. Maintenance frequency is the most important factor to take into account. An engine that has its oil and filter changed regularly, and other required maintenance performed, will reliably last for many thousands of miles. Conversely, a poorly maintained engine may require overhaul at very low mileage.
3. Excessive oil consumption indicates that the piston rings, valve stem seals and / or their guide bushings are damaged (however, the possibility of leaks must first be ruled out). Perform a compression and leak test as described in Section 1A, to determine the cause of excess lubricant consumption.
4. Having established the measuring device in an aperture under the gauge of pressure of oil, check up pressure and compare the received result with the data provided in Specifications. If the pressure is low, the main and connecting rod bearings and/or the oil pump are probably worn out.
5. Loss of power, erratic engine operation, noise in the engine or valvetrain, and high fuel consumption may also mean that the engine needs to be overhauled, especially if all of these factors are present at the same time. If a full course of service does not correct the problem, regrinding/replacing worn components is the only solution.
6. A complete engine overhaul involves the restoration of all internal parts, as well as the replacement of pistons and piston rings. As a rule, new liners of main and connecting rod bearings are installed; if necessary, the crankshaft can be replaced; in addition, valves are serviced. The oil pump should also be carefully inspected and replaced if there is any doubt as to its condition. When rebuilding the engine, it is also possible to rebuild the starter and alternator.
Note: When overhauling the engine, replace the coolant hoses, thermostat and water pump. Carefully inspect the radiator to make sure it is not clogged or leaking.
7. Before proceeding with the overhaul of the engine, read the description of all procedures and prepare everything necessary. If you carefully follow all the instructions and prepare the necessary tools and equipment, the work will not cause much difficulty, although it may take a long time. Check if the required spare parts are available. Most of the work can be done with ordinary tools, but precision measuring tools are required to inspect parts and determine if they need to be replaced.
Note: The engine must be completely dismantled and all components inspected before deciding which repairs to perform (especially the cylinder block and crankshaft). The condition of these components is the main factor that determines whether an engine can be rebuilt or should be replaced with a remanufactured block. Do not buy parts or repair any components until you have made this decision.
8. To maximize the life of a remanufactured engine, ensure that it is reassembled with impeccable cleanliness.
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