The following basic schemes for carrying out major engine repairs can be distinguished:
Repair and replacement of components on an individual basis - If the condition of the block and the main internal components of the engine are found to be satisfactory during the inspection, the most reasonable solution would be to service them individually. In this case, the condition of the block, crankshaft and connecting rod-piston groups should be carefully checked. Even with a very insignificant degree of block wear, its cylinder mirrors must be honed.
Using the crankshaft repair kit - The kit consists of a machined crankshaft and a set of repair connecting rods with pistons installed on them. Piston rings and bearing shells are also included. The kit can be designed for installation both in a block with standard-size cylinders and in a machined assembly.
Using a reduced engine block kit - The reduced kit includes a cylinder block with a crankshaft and connecting rod and piston groups already installed in it. At the same time, all crankshaft bearings are equipped with new liners, and their working clearances are precisely adjusted. Then such a kit is additionally equipped with camshafts removed from the old engine, valve train components, cylinder head and attachments without any global mechanical work.
Using the Extended Engine Block Kit - The extended kit is a reduced kit, plus an oil pump, oil pan, cylinder head with cover, camshaft, valve train components and timing drive (gear wheels with timing belt) with covers. All provided bearings, seals and gaskets are new, clearances are adjusted. It remains only to connect the intake manifold with the exhaust manifold and attachments to the block.
Another option is also possible replacement of the engine assembly. Many branded service centers offer a similar service at the exchange base, exchanging worn-out units for new or restored ones.
Before choosing any of the listed schemes for performing major engine repairs and proceeding to purchase the corresponding replacement components, consult with car service specialists, representatives of the branded service center of the manufacturer of your car and more experienced car enthusiasts.