6. CYLINDER HEAD/VALVES People GT 125i CYLINDER HEAD Check the spark plug hole and valve areas for cracks. Check the cylinder head for warpage with a straight edge and feeler gauge. Service Limit: 0.05 mm Valve Spring Compressor ASSEMBLY Install the valve spring seats and oil seal. Be sure to install new oil seal. Lubricate each valve with engine oil and insert the valves into the valve guides. Install the valve springs and retainers. Compress the valve springs using the valve spring compressor, then install the valve cotters. · When assembling, a valve spring compressor must be used. · Install the cotters with the pointed ends facing down from the upper side of the cylinder head. Special tool: Plastic Hammer Valve Spring Compressor A120E00040 Tap the valve stems gently with a plastic hammer for 23 times to firmly seat the cotters. Be careful not to damage the valves. Cylinder Head 6-13