LOOSE TAPPETS
Modern engines, except for a few super-efficiant sports models, run s best when they are quietest. DBFORE starting, have the tappets *-* checked for clearance, which should be about six-thousandths of an inch, or the thickness of a safety razor blade, and make sure that tappet spanners are included m the tool-kit. It is quite common for the 'tappet lock-nuts to loosen, allowing the tappets to screw themselves ba<"i<:. The, symptom is a loud clicking noise, corresponding m frequency to half engine speed. Adjustment should be made immediately, for running with loose tappets may cause valve trouble which would take half a day or more to rectify. .
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https://paperspast.natlib.govt.nz/newspapers/NZTR19290207.2.151
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NZ Truth, Issue 1210, 7 February 1929, Page 19
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108LOOSE TAPPETS NZ Truth, Issue 1210, 7 February 1929, Page 19
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