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Aviation History
1944
1944 - 1508.PDF
Flight, July 2jth, 1944. THE SLEEVE VALVE EXPLAINED. ...No. 7 REDUCING MAINTENANCE Externally the most impressive feature about a " Bristol " sleeve valve engine is the complete absence of complicated overhead valve gear. On " Bristol " engines there is no such thing as the grinding-in of valves, the inspection and replacement of springs, or the tedious job of adjusting tappets ; the only maintenance necessary is the usual servicing of ignition and carburettor, and occasional check on the oil filters. 'When period overhauls are carried out, however, a " Bristol " sleeve valve engine is easily dismantled, and on re-assembly, valve timing presents no problem. All valve operating gears and cranks are numbered, as are the sleeves ; it is only a matter of passing the sleeve down over the piston until its driving band locates on the sleeve-crank ball-joint. Once the ball-joint is secured to the sleeve, the cylinder and head can be assembled. When you realise how easy it is to maintain a sleeve valve engine you will understand the advantages of SLEEVE VALVE AERO ENGINES
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