2. This part contains information from advice on preparation for repair and selection of spare parts to detailed, step-by-step descriptions of procedures for removing, inspecting, rebuilding and installing internal engine components
3. After paragraph 5, all information implies the situation when the engine has already been removed from the car. For information involving repair of the engine while not removed from the vehicle, as well as operations for the removal and repair of external engine components that do not require removal of the engine, refer to the previous relevant parts of this chapter (2A - for petrol engines and 2B - for diesel) and to paragraph 5 of this chapter. Many of the operations that make up the procedure for repairing engine components that are not removed from the car can be skipped if the engine has already been removed.
4. Except for the tightening torques for screw connections given at the beginning of the respective chapters 2A or 2B, specifications regarding engine overhaul are given at the beginning of this chapter 2B.
1. It is not always easy to decide when and if an engine needs to be overhauled, as many factors must be taken into account.
2. High mileage does not at all mean that an engine overhaul is necessary, just as low mileage does not guarantee a good engine condition. The main and most important thing in this is the regularity of maintenance. An engine in which oil and filters have been changed frequently and regularly and other necessary operations, will respond to care with long and reliable work.
3. Increased oil consumption indicates that piston rings, valve stem seals and/or valve guides need attention Before deciding on the causes of increased oil consumption, make sure that oil leaks are not to blame. To get an idea of the possible cause of the problem, check the compression as described in chapter 2A or 2B.
4. Check the oil pressure using a compression gauge screwed in instead of the emergency oil pressure sensor and compare with the values prescribed specifications. If it's too low, maybe. Worn main or connecting rod bearings, or oil pump.
5. Loss of power, erratic engine operation, knocking or metallic noises in the engine Increased noise in the timing mechanism and increased fuel consumption may indicate the need for repair, especially if several symptoms are present at the same time "surgical intervention".
6. Engine overhaul means restoring engine components to meet New Engine Specification. 8 during the repair, pistons and piston rings are replaced, new connecting rods and main bearings are usually installed; if necessary, the crankshaft is ground to restore the necks. The valve mechanism is being audited, since they are usually not in the best condition in this situation. It’s also a good idea to sort out engine attachments, such as a starter and a generator, along the way. The end result should be a practically new engine that will work without problems for more than one hundred thousand kilometers.
Note. During a major overhaul, the least durable and critical parts and components of the cooling system, such as hoses, a thermostat and a water pump, should also be replaced. Carefully check the radiator for leaks, whether it is clogged with metal corrosion products. It's also a good idea to replace the oil pump when overhauling the engine.
7. Before starting an engine repair, familiarize yourself with the basic procedures to get an idea of the scope and complexity of the work ahead. Engine repair is not difficult if you carefully follow all instructions, have the necessary tools and equipment, and carefully follow the requirements of the Specifications. Of course, this will take quite a long time. Plan to be without a car for at least a couple of weeks, especially if you need to send parts to repair shops. Check the availability of the necessary spare parts and the necessary tools and equipment that you need to stock up in advance. Most of the work can be done with a normal tool, although in some cases an accurate measuring tool may be required to decide whether to replace parts. Often in workshops, specialists can suggest by measuring whether it is worth restoring the removed parts, or it is better to replace them with new ones.
Note. Wait until the engine is completely disassembled before making a decision to repair or replace parts (this is especially true for the crankshaft and cylinder block) and making the necessary measurements. It is their condition that should become the main factor in making a decision whether to restore this engine, or to purchase a restored one. Therefore, do not purchase spare parts in advance and do not start repairing other engine systems. until you make that decision. The general rule is that the main cost of repair is time, so do not install non-standard or old parts in the engine. Since repairs are expensive and time-consuming, wear-out or non-standard parts should not be installed.
8. And the last note: to get the desired result - maximum life with a minimum of problems from a rebuilt engine - assemble the engine carefully, with clean tools on clean equipment.
Visitor comments