Handy Tool for Tappet Adjustment
Page 52
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131OR facilitating the adjustment of side-valve tappets of the type that are free to turn in their guides, an ingenious little tool has been invented and patented by Mr. A. E. Fowler, 2, Thyra Grove, North Finchley, London, N.12. The accompanying sketch shows the device as made for an engine such as the Morris, the tappets of which must normally he held with one spanner, whilst another prevents the adjustment from altering and a third tightens, the lock-nut. It is designed to replace the first-named spanner.
Provided with jaws to fit the flats on the tappets, it has also shoulders at its! ends, to bear against the guide or housing and the side of the tappet chamber respectively. A milled nut, operating similarly to an adjustable spanner, enables the tool to be expanded lengthwise, so that it firmly holds itself in position and prevents the tappet from turning, thus leaving both bands free to manipulate the adjusting screw and the Jock-nut.
On the centre of the shoulder which may bear against the cylindrical tappet guide, the surface of the steel is roughened to prevent the device from slipping, and it should be noted that, owing to the fact that the pressure exerted by the milled nut is taken by the shoulder, the tappet remains quite free in the Aws, and the clearance can, therefore, be tested accurately without releasing the milled nut.
Strongly constructed and hardened, the tool costs 5s.
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