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2. Main bearing - Wikipedia

   en.wikipedia.org/wiki/Main_bearing

   A main bearing (center) of a Napier Deltic diesel locomotive engine (with its crankshaft removed) A main bearing is a bearing in a piston engine which holds the crankshaft in place and allows it to rotate within the engine block. The number of main bearings per engine varies between engines, often in accordance with the forces produced by the ...

3. Cross-bolted bearing - Wikipedia

   en.wikipedia.org/wiki/Cross-bolted_bearing

   A cross-bolted bearing is a bearing, usually a crankshaft main bearing of a piston engine, reinforced with additional transverse bolts.Most bearing caps are retained by two bolts, one on each side of the bearing journal, and parallel to the cylinder axis (or, on vee engines, parallel to an axis bisecting the vee angle).

4. Crankshaft - Wikipedia

   en.wikipedia.org/wiki/Crankshaft

   The number of main bearings is determined based on the overall load factor and the maximum engine speed. Crankshafts in diesel engines often use a main bearing between every cylinder and at both ends of the crankshaft, due to the high forces of combustion present.

5. Tunnel crankcase - Wikipedia

   en.wikipedia.org/wiki/Tunnel_crankcase

   A tunnel crankcase, tunnel crankshaft or disc-webbed crankshaft [1] is a design feature of a piston engine where the main bearings that support the crankshaft within the crankcase form the largest diameter of any part of the crankshaft and are larger than the crank webs. This requires a crankcase with a large tunnel instead of cross web ...

6. Straight-six engine - Wikipedia

   en.wikipedia.org/wiki/Straight-six_engine

   Crankshaft with four main bearings. Crankshafts for straight-six engines usually have either four main bearings (i.e., a bearing in between each pair of crankpins and one at each end) or seven main bearings (i.e., a bearing between every crankpin): Large displacement and diesel engines typically use seven bearings to minimize crankshaft flex.

7. Long-bolt engine - Wikipedia

   en.wikipedia.org/wiki/Long-bolt_engine

   A long-bolt or through-bolt engine is an internal combustion piston engine where, following usual practice, the cylinder head is held down by bolts or studs.Conventionally the cylinder head is bolted to the cylinder block and the crankshaft main bearings are in turn bolted to the crankcase by separate bolts.