Bearing shell Bearing cap DIESEL ENGINES BEARINGS By Er. Laxman Singh Sankhla B.E.Mech., Chartered Engineer Jdh!"r, India Mail ID# laxman$$$%&&'(yah.c.in Bearings Big End Bearings Big end bearings as shown in fig. 6 are commonly known as shell bearings. They come into two ev pieces with provision for oil passages and fit on the big end of the connecting rod, one on th piece on the cap. They are lined with copper lead alloy and lead tin-plated. This face of the delicate and soft and care should be taken not to scratch the same. Any scoring on the face wil performance of the bearing shell and may result in the leakage of oil pressure between the cra bearing. Fig. 6 Bearing cap and bearing shell. Always ensure that the bearing shell are matched pair and are not scored or damaged. That the l correctly with the slots on the connecting rod. Care should also be taken to ensure that a prop after installing the bearing for operation. !efer figure ".
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Bearings
Big End Bearings Big end bearings as shown in fig. 6 are commonly known as shell bearings. They come into two evenly split pieces with provision for oil passages and fit on the big end of the connecting rod, one on the rod and the other piece on the cap. They are lined with copper lead alloy and lead tin-plated. This face of the bearing is very
delicate and soft and care should be taken not to scratch the same. Any scoring on the face will affect the performance of the bearing shell and may result in the leakage of oil pressure between the crankshaft and the bearing.
Fig. 6 Bearing cap and bearing shell.
Always ensure that the bearing shell are matched pair and are not scored or damaged. That the locks match correctly with the slots on the connecting rod. Care should also be taken to ensure that a proper torue is applied
after installing the bearing for operation. !efer figure ".
Small End Bearing)
The small end bearing is a phosphor bron#e bush, which is pressed fit into the small end of the connecting rod.
Main Bearing)
The main bearings are similar to the large end bearings and are fitted between each crank $ournal to support and centrali#e the crankshaft. These bearings are manufactured to very fine tolerances and are easily renewable. This is done if the clearances are found to be e%cessive or at periodic recommended overhaul. Two halves are dowelled together and located by the lugs formed on the outer surface of the shells, which engage with notches machined in the bearing housing and caps. &ifferent types of engine bearings are shown in fig. '. The caps are numbered for the correct replacement, as they are pre-machined for the correct bore and aligned
with the other bores. (ismatching will cause the bearing distortion and damage to the crankshaft.
Fig. 8. Different types of bearings used on engine.
*hr")t Bearing.
)t is of prime importance that the crankshaft must have end float with the tolerable set limits. *teel backed copper-lead pads are therefore fitted to both sides of one of the main bearings to avoid the e%cessive a%ial
movement of the crankshaft.
Big End Bearings Big end bearings as shown in fig. 6 are commonly known as shell bearings. They come into two evenly split pieces with provision for oil passages and fit on the big end of the connecting rod, one on the rod and the other piece on the cap. They are lined with copper lead alloy and lead tin-plated. This face of the bearing is very
delicate and soft and care should be taken not to scratch the same. Any scoring on the face will affect the performance of the bearing shell and may result in the leakage of oil pressure between the crankshaft and the bearing.
Fig. 6 Bearing cap and bearing shell.
Always ensure that the bearing shell are matched pair and are not scored or damaged. That the locks match correctly with the slots on the connecting rod. Care should also be taken to ensure that a proper torue is applied
after installing the bearing for operation. !efer figure ".
Small End Bearing)
The small end bearing is a phosphor bron#e bush, which is pressed fit into the small end of the connecting rod.
Main Bearing)
The main bearings are similar to the large end bearings and are fitted between each crank $ournal to support and centrali#e the crankshaft. These bearings are manufactured to very fine tolerances and are easily renewable. This is done if the clearances are found to be e%cessive or at periodic recommended overhaul. Two halves are dowelled together and located by the lugs formed on the outer surface of the shells, which engage with notches machined in the bearing housing and caps. &ifferent types of engine bearings are shown in fig. '. The caps are numbered for the correct replacement, as they are pre-machined for the correct bore and aligned
with the other bores. (ismatching will cause the bearing distortion and damage to the crankshaft.
Fig. 8. Different types of bearings used on engine.
*hr")t Bearing.
)t is of prime importance that the crankshaft must have end float with the tolerable set limits. *teel backed copper-lead pads are therefore fitted to both sides of one of the main bearings to avoid the e%cessive a%ial
movement of the crankshaft.
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