When adjusting valves on an engine with a floating cam ring, what must be done to the valve spring pressure?

• A. The pressure of the valve springs on the opposite side must be removed so the cam ring will be tight against the bearing for the valves being adjusted.
• B. The valve springs should be left under pressure while adjusting.
• C. The cam ring should be loosened from the bearing during adjustment.
• D. No special pressure is required; adjust with springs loaded.

Answer: (A)

With a floating cam ring, the ring isn’t tightly fixed in place and can shift slightly under hydraulic pressure from the valve springs. To set valve lash accurately, you want the cam ring to sit solidly against its bearing so the clearance you measure reflects the true position of the valve and lifter. By relieving the valve spring pressure on the opposite side, you remove that hydraulic force, letting the cam ring settle and stay in position while you adjust the valves on the side being worked. After the adjustment, you reapply the spring pressure. This prevents the cam ring from moving during measurement and ensures a correct, stable setting.