Town Car V8-4.6L VIN W (1997)
Valve Spring: Testing and Inspection
INSTALLED HEIGHT
Measure assembled height of valve spring from top of spring seat to underside of valve spring retainer with dividers. Check dividers against a
scale. If assembled valve spring height is greater than 40 mm (1.575 inch), install necessary spacers between cylinder head spring seat and valve
spring.
LENGTH INSPECTION
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Inspect each valve spring for cracks or damage and replace as necessary.
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Measure the free length of each valve spring as shown. If not approximately 50.20 mm (1.9764 inch), replace the valve spring.
TENSION
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Weak valve springs cause poor engine performance. Inspect the valve spring, valve spring retainers, valve spring retainer keys and sleeves for
wear or damage. Discard any damaged parts.
NOTE:
