Automotive Systems

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Valves in Block

Valves in Block

This type of valve arrangement is not commonly seen in the field; however, the adjustment procedure is described in case you should happen to run across this type.

Valves within the block are adjusted "cold"; that is, recommended valve clearances are provided for a cold engine. These valves have mechanisms quite similar to overhead valves. They are adjusted by removing the side cover plate beneath the intake manifold on the side of the engine block (fig. 3-75). Since you must stop the engine to adjust the valves, the piston in the cylinder must be on TDC of the compression stroke. You can determine this by watching the valves of the piston that is paired with the one that is being set. As the cylinder that is being positioned is coming up on the compression stroke, the paired cylinder is coming up on the exhaust stroke; therefore, the exhaust valve is open. Just as the exhaust valve closed and the intake valve begins to open, the cylinder to be set is on TDC of the compression stroke, and you can set the two valves. Once the No. 1 cylinder is positioned, follow through according to the firing order of the engine, as this makes the job easier and faster. You may also use this procedure when adjusting valves on overhead engines.

Figure 3-75.—Adjusting valve in block.
Published by SweetHaven Publishing Services
Based upon a text provided by the U.S. Navy

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