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Line Boring

  • Selective electro-plating and thermal spraying to re-establish OEM design sizes.
  • Make-up sleeves to re-establish damaged bores to OEM design sizes.
  • Metal stitching repairs for major and minor fractures or broken castings.
  • Milling of worn bearing cap location.

On-site line boring of large generating and marine diesel engine and compressor main bearing bores which have been damaged by engine failures and the like lend themselves to this very convenient and competitive repair procedure.

The company has a range of in-line boring machines and associate optical alignment tooling and accessories to cover most engine types requiring engine bedplate rejuvenation whether they be the conventional bedplate layout or the under-slung type of engine.

Repairs carried out by our experienced personnel can take the form of repairing individual main bearing pocket bores or the whole line of bores.

Working closely with the engine manufacturers, owners or both, a defined workscope is formulated and the work administered in accordance with OEM design standards.

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 a 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 provided by the manufacture with the half bore having an allowance left in the bore 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 possi- ble make-up plating to remove fretting and wear, etc.


        Cracks Deaticted
          Metalstiching Done           Boring in progress           Line boring OF BLOCK
                   AT QATAR
        Boring in progress
   Self Fitting and Line Boring       
    of Main Housing of Fuzi
          Boring completd
     as per OEM design sige