TRACING A KNOCK
A Satisfactory Test
A knock or any similar mechanical sound coming from an engine is sometimes very difficult to trace. Special knock-detecting devices, consisting of a microphone and car-pieces, are used in works and service stations, but tho ordinary motorist • has not access, to them.
A reasonably satisfactory substitute is, however, to" be found in an ordinary wooden-hundled ,-hammer. This is clasped with the palm of the hand over the head of the hammer whilst the end of tho handle is pressed against that part of tho engine near which the source of the knock is suspected, the engine, of course, being run at. the time.
An car should then bo pressed firmly against the back, of the hand, clasping the hammer. It will be found that tho noises of the engine are localised and magnified, tho wooden hammer shaft being quite a good conductor of sound. If the haminer be moved to various likely spots, it should not be long before the trouble is located.
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https://paperspast.natlib.govt.nz/newspapers/MT19351002.2.95.7
Bibliographic details
Manawatu Times, Volume 60, Issue 232, 2 October 1935, Page 13
Word Count
169TRACING A KNOCK Manawatu Times, Volume 60, Issue 232, 2 October 1935, Page 13
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