BMW 11217580483 Engine Crankshaft

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The groove in the cylinder liner allows coolant to flow from one side of the cooling duct to the other.

The upper section of the crankcase consists of an AluSil insert cast in a magnesium alloy, with the timing cover being an integral part of the engine block. The AluSil cylinder bores are not equipped with iron cylinder liners, meaning the cylinder bores cannot be machined, but the deck surface may be planed. The AluSil insert has threaded bores for transmission, cylinder head and crankshaft main bearing bolts, and provides coolant passages to prevent coolant contact with the magnesium portion of the engine block. The lower section of the crankcase is a bedplate structure made of magnesium with sintered steel inlays for main bearing support. A liquid sealant is injected under high pressure into a machined groove between upper and lower crankcase sections. The crankshaft is cast iron with 7 main bearing journals, with the trigger wheel for the crankshaft sensor located between cylinders 5 and 6. The big end of each connecting rod is cracked to allow centering of the bearing cap without the use of dowel pins, and pairing codes are stamped on each connecting rod to match the correct rod cap to the connecting rod. The small end of the rod is tapered, reducing weight without affecting strength. The connecting rods are separated into weight categories and can only be replaced as a set. The pistons are manufactured from aluminum and have 4 valve reliefs, with the undersides of the pistons being cooled with oil spray jets.