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CHASSIS LONGEVITY
Page 78
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The Needs of Maintenance Engineers are Met by Many Specialist Concerns, and the Vehicle Maker Provides for Easy Replacement of Parts Especially Subject to Wear
VEHICLES which are constantly in the repair shop represent a financial loss, and it is the aim of every operator to keep his machines on the road for the maximum practicable proportion of their life. To this end he is aided by the many concerns undertaking specialist repair work, and producing parts and equipment expressly devised for lengthening the life of chassis.
For a variety of reasons the power unit is the component to which most attention has been given by the companies concentrating their energies upon work of this description. The products of these include cylinder liners, pistons, rings, valve-seat inserts, valves, guides, bearings, etc., and tools and equipment for executing the replacements add repairs, whilst others in the group specialize in carrying out the work of reboring, fitting the new parts, reseating valve ports, remetalling bearings and so forth.
There are also welders, expert in the particularly difficult work of repairing cylinder blocks, crankcases, crankshafts, etc., and numerous engineers directing their activities in similar directions.
A certain similarity of material and method enables those engaged in this class of work to practise more than one particular branch of it.
For example, the British Piston Ring Co., Ltd., produces piston rings, cylinder liners, valve-seat inserts, valve guides and brake-drum liners, the alloys used for them all being selected to stand up to the special conditions obtaining in usage. For instance, the cylinder liners, which must resist corrosion, are of Brimol stainless austenitic material. This concern also makes Covmo pistons, of both the castiron and aluminium-alloy types.
Typical of equipment expressly devised for the maintenance engineer may be mentioned the big range of Buma tools, which includes inexpensive and time-saving appliances for relining, reseating and similar operations.
Where cylinder wear has occurred to an extent insufficient
to justify reboring, but enough to increase oil consumption beyond a reasonable figure, it is often practicable to fit piston rings devised to counter this fault.
An instance is the Cords oil sealing ring, which is claimed to be particularly efficient becausing of the wiping action of the multiple faces. The ring is of laminated construction, the units being formed of flexible finegrained alloy. As a result of this scheme, the Cords ring adapts itself to worn bores, preventing the passage of oil past the piston.