High engine mileage is not always a prerequisite for repair, and vice versa - low mileage does not guarantee the absence of the 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 that there are no oil leaks. Additional information about repair volumes can be obtained by measuring compression pressure ("compression") in a cylinder (see Section 3).
Pic. 2.4 The installation location of the pressure gauge is located on top of the oil filter housing
Check the oil pressure with a pressure gauge installed in place of the pressure gauge (see fig. 2.4) and compare it with the specification data. Low pressure may indicate bearing wear and/or damage to the oil pump.
Loss of power, rough running, bumps and mechanical noises, increased valve train noise and high fuel consumption are usually signs of a need for repair, especially if all these troubles occur at the same time.
If the adjustment work did not correct the situation, then the only solution should be considered the need for repair.
During the repair, a decision can be made to restore the walls of the cylinder (boring and/or honing). If a decision is made to bore, then it is necessary to install the appropriate piston / ring kit. The main bearings and connecting rod bearings are usually simply replaced with new ones; repair of the crankshaft journals is rarely required. Valves that do not differ much from new ones in their condition can be reused. You can also use components such as a distributor, starter, generator.
Note: Critical parts of the cooling system 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 their implementation.
Most work can be done with normal tools, but precision gauges are also required to inspect engine parts.
Note: Decide on the need to rebuild parts, especially the block on machines, before the engine is completely disassembled.
Since the condition of the unit is a major factor in deciding whether to repair or replace it, never buy parts until the unit has been fully inspected. Don't pay to install worn or remanufactured parts.
The engine will last longer and cause fewer problems if the assembly is meticulous and very clean.