735525M91 New Inner Engine Valve Spring Made for Mpl Moline Tractor Model 1850One New Aftermarket Replacement Inner Engine Valve Spring for Minneapolis Moline (Mpl Moline), Oliver, and White Tractors This aftermarket replacement inner engine valve spring is a critical valvetrain component, working in conjunction with the outer valve spring to maintain proper valve seating, control valve lift, and reduce harmonics during engine operation. Twelve (12) inner valve springs are used per engine. Fits the Minneapolis Moline (MM) and