The information concerns the sequence of preparation for repair and a step-by-step description of the operations of removing and installing engine components and checking them.
It is not always easy to determine what and where in the engine requires repair: too many factors should be taken into account. High mileage of the engine is not always a prerequisite for repair and vice versa, low mileage does not guarantee the absence of the need for repair.
Increased oil consumption indicates the need to pay attention to the condition of the piston rings, oil seals and valve guides. When deciding to repair these units, make sure there are no oil leaks. Additional information on the scope of repairs can be obtained by measuring the compression in the engine cylinders.
Check the oil pressure using a pressure gauge installed instead of the oil pressure sensor. A low oil pressure indicates worn bearings or damaged oil pump.
A loss of power, uneven engine 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.
During a major overhaul of the engine, the pistons and piston rings are replaced, and the cylinders are bored. New main and connecting rod bearings are also installed, and if necessary, the crankshaft journals are reground and connecting rod and main bearings of repair sizes are installed. Pay special attention to the condition of the oil pump and, if there are any doubts about its reliability, replace it. The cooling system hoses, thermostat and water pump are subject to mandatory replacement.
Material created based on the website (Mercedesman.ru)
Engine repair is not difficult if all work is done carefully and you have the necessary tools and equipment.