High engine mileage is not always a prerequisite for repairs and vice versa - low mileage does not guarantee that there is no need for it.
Increased oil consumption indicates the need to pay attention to the piston rings, valve seals and/or guides. When deciding to repair these components, make sure there are no oil leaks. Additional information on the scope of repair can be provided by measuring the compression pressure ("compression") in the cylinder (see Section 3).
Fig. 2.4 The installation location of the pressure gauge is located on top of the oil filter housing
Check the oil pressure using a pressure gauge installed in place of the pressure gauge (see fig. 2.4) and compare it with the specification data. A low pressure value may indicate worn bearings and/or damaged oil pump.
Loss of power, rough operation, knocks and mechanical noises, increased valve mechanism noise and high fuel consumption usually indicate the need for repairs, especially if all these problems occur simultaneously.
If adjustment work does not correct the situation, then the only solution is to consider the need for repairs.
During repairs, a decision may be made to restore the cylinder walls (boring and/or honing). If a decision is made to bore, then it is necessary to install the corresponding piston/ring set. The main and connecting rod bearings are usually simply replaced with new ones; crankshaft journal repair is rarely required. Valves, which in their condition are not much different from new ones, can be reused. You can also use such units as a distributor, starter, generator.
Note: Critical cooling system components such as hoses, drive belts, thermostat and water pump must be replaced with new ones.
We do not recommend repairing the oil pump - replace it with a new one when repairing the engine.
Before starting repair work, familiarize yourself with the procedure and conditions for carrying it out.
Most work can be done with common tools, but precision measuring instruments are also required to inspect engine parts.
Note: Make a decision on the need to rebuild parts, especially the block, on machines before the engine is completely disassembled.
Since the condition of the unit is the main factor in deciding whether to repair or replace it, never buy parts before you have fully inspected the unit. Do not pay to install worn or refurbished parts.
The engine will last longer and have fewer problems if the assembly is careful and very clean.
The text was taken from the website: hondabook.ru