WEAR IN VALVE GEAR
Valves may become loose in their guides or their efficiency may he impaired by faulty seatings, hy burning and by pitting. It is not a very costly matter to replace valves and guides nowadays, but the seatings present rather a special prohlem, hecause they are formed in the metal of either the cylinder hlock or the head; both intricate and expensive components. If the seatings have heen re-cut several t;mes, they become recessed; furtber re-cutting may then prove impossible owing to lack of metal, and in any case the recessed position of the valve masks the initial part of its opening movement and leads to loss of efficiency. Some c'oncerns specialise in buildmg up the seating with new metal by ingenious processes, while other lit separate seatings in the form of rings that are pressed and pegged in place. Other parts that will repay examination when an engine is dismantled include the timing gear, the lubrication system and thc camshaft with its bearings and tappets.
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https://paperspast.natlib.govt.nz/newspapers/RMPOST19320415.2.3.4
Bibliographic details
Rotorua Morning Post, Volume 1, Issue 199, 15 April 1932, Page 2
Word Count
169WEAR IN VALVE GEAR Rotorua Morning Post, Volume 1, Issue 199, 15 April 1932, Page 2
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