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1938 Cadillac V16 - GM Heritage Center

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Zero<br />

Clearance<br />

• — S 0<br />

-HJ»?==<br />

When the valve is closed oil<br />

is forced by the engine's lubricating<br />

system in around the<br />

ball check valve. This oil pressure<br />

holds the tappet firmly<br />

against the valve stem. Clearance<br />

is zero and the valve<br />

is in accurate adjustment.<br />

When the valve opens the<br />

ball check valve prevents oil<br />

from escaping again insuring<br />

zero clearance. A controlled<br />

oil bleed around the tappet<br />

plunger compensates for valve<br />

expansion maintaining accurate<br />

adjustment.<br />

HYDRAULIC VALVE SILENCER OPERATION

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