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Light and Heavy Vehicle Technology
book

Light and Heavy Vehicle Technology

by M.J. Nunney
March 2016
Intermediate to advanced content levelIntermediate to advanced
514 pages
33h 25m
English
Newnes
Content preview from Light and Heavy Vehicle Technology
THE RECIPROCATING PISTON PETROL ENGINE 49
Conventiona
high fnctior,
lock
Low' friction (Action of spring)
release type Valve opening valve closed
Figure 1.91 Methods of valve spring retention
washer with a central conical recess. Seating in the
latter is a pair of split-type wedge collets which in turn
engage a shallow groove machined near the top of the
valve stem (Figure
1.91a).
The pressure exerted by the
valve spring therefore holds the collets tightly in place,
yet they can readily be removed (albeit with a little
persuasion from a soft-faced mallet in some cases!) by
depressing the spring while holding the valve closed.
This method o
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Publisher Resources

ISBN: 9781483105062