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.
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.
valve in block.