PISTON SLAP COMMON.
OFTEN MISTAKEN FOB VALVE NOISE. Scores of engines in which, might be termed the middle-age period of their existence —that is, between 18 and 30 thousand miles —suffer from . piston slap, without their owners having any idea that anything is the matter. Slight piston slap can very easily be mistaken for valve clatter, but it has •this important difference: Whereas the noise of a valve is present under all conditions of driving, piston slap is hard driven, and frequently disappears harl driven, and frequently disappears when the ear is pushing the engine. Piston slap also seems unaccountably to disappear for short periods, and then return without warning. It is an annoying but its long as engine is eareiiully and not raced, the engine can mn and perform creditably without much danger. , . When, however, the noise becomes lend and bell-like, it is time to have repairs undertaken. Except where the cylinder has become scored, over-size pistons will usually cure the trouble, but as piston trouble is sometimes met with after a temporary shortage of oil, it sometimes happens that the cylinder wall itself has been slightly damaged. In this ease •the cylinder will have to be scraped, and in bad cases rebored.
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Hawera Star, Volume XLVIII, 23 February 1929, Page 12
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204PISTON SLAP COMMON. Hawera Star, Volume XLVIII, 23 February 1929, Page 12
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