Engine Line Boring
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There are various ways in which to repair these bores and it very much depends on the maker’s preferences. Often bores are machined oversize, thermal sprayed and finally bored to standard size. Though rarely used selective plating in another means of repair, again bores are machining oversize, electro-plated before machining to standard sizes. Sleeving of main bearing bores is another common method often adopted to repair damaged bores, this procedure requires the bores to be machined to allow the fitting of a make-up sleeve and secured with a series of radially fitted screws prior to machining to design size. An allowance is left in the sleeve for final machining to standard size.
In each of the above repair methods it is only the lower half bearing bore that requires attention in the case of a conventional bedplate and the upper half bore of the under-slung engine type. The mating bearing caps can be reused, but more often than not, new bearing caps are advised and provided by the manufacture with the half bore having an allowance left on the diameter for final machining on assembly. Associated repairs and procedures allied to bedplate main bearing bore work would take the form of advanced metal stitching of heat induced cracking, milling of bearing cap fit location and possible make-up plating to remove fretting and wear.
Engine Line Boring
Thermal Spraying
Laser & Optical Alignment
Sleeving of main bearing bores is another common method often adopted to repair damaged bores, this procedure requires the bores to be machined to allow the fitting of a make-up sleeve and secured with a series of radially fitted screws prior to machining to design size. An allowance is left in the sleeve for final machining to standard size.
In each of the above repair methods it is only the lower half bearing bore that requires attention in the case of a conventional bedplate and the upper half bore of the under-slung engine type.
The mating bearing caps can be reused, but more often than not, new bearing caps are advised and provided by the manufacture with the half bore having an allowance left on the diameter for final machining on assembly. Associated repairs and procedures allied to bedplate main bearing bore work would take the form of advanced metal stitching of heat induced cracking, milling of bearing cap fit location and possible make-up plating to remove fretting and wear.
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