Main Bearing Journal
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The two general classes of bearings are journal bearings, also known as sliding or plain surface bearings, and rolling element bearings, sometimes also called ball bearings. The aims of this chapter are to describe the range of bearing technology, to outline the identification of which type of bearing to use for a given application, and to introduce journal bearing design with specific …
The primary function of a bearing is to carry load between a rotor and the case with as little wear as possible. This bearing function exists in almost every occurrence of daily life from the watch on your wrist to the automobile you drive to the disk drive in your computer.
In a piston engine, the main bearings are the bearings on which the crankshaft rotates, usually plain or journal bearings. The bearings hold the crankshaft in place and prevent the forces created by the piston and transmitted to the crankshaft by the connecting rods from dislodging the crankshaft, instead forcing the crank to convert the reciprocating movement into rotation.
The main bearings are the bearings that support the crankshaft in the engine block and allow the crankshaft to rotate. The surfaces of the crankshaft these bearings run on are called journals. So the bearings can be called main bearings, or main journal bearings. And the journals can be called main bearing journals, or main journals.
Blocks were made for each crank main journal size. If you are putting a "small" or "medium" journal smallblock crank into a "medium" or "large" journal smallblock block you will need crank bearing "spacers" or use special "thick" bearings available from aftermarket suppliers. Small Block crankshafts. Gen.I, "Small Journal"
CRANKSHAFT TOLERANCES MAIN BEARING AND CRANKPIN JOURNALS Finish of Journals: 15 micro inches Ra or better (10 micro inches Ra or better for heavy duty or highly loaded engines) Diameter Tolerance: .0005” (.013mm) up to 1.500” (38mm) journal. .001” (.025mm) for 1.500” (38mm) to 10.000” (250mm) journal. Out-of-Round:
babbitt bearing lining, displacing metal and creating a high-spot. The high-spot may be large enough to make contact with the journal causing a rubbing action that can lead to the eventual breakdown and rupture of the bearing lining. Foreign particles may embed only partially and the protruding portion may come in contact with the journal
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