Table of contents: Checking the appearance of the…↓ Cylinder head machining dimensions ↓
Valve seats with signs of wear and burning can be machined, preserving the correction angles and seat width. Otherwise, the cylinder head must be replaced. Always machine valve seats until the working surface is perfect. The valve seat can be replaced using conventional workshop pressing equipment. A valve seat cutter is required for machining. Since handling this tool requires special experience, this work must be performed in a workshop.
Checking the appearance of the working surface of the valve plate
1. The contact surface of the valve chamfer (1) must be located in the middle of the valve plate width and extend evenly around the entire circumference.
2. If the thickness of the valve plate (2) is below the wear limit (limit value), replace the valve.
Cylinder head machining dimensions
If the deformation of the sealing surface exceeds the limit value of 0.1 mm, the sealing surface of the cylinder head should be treated.
Height of new cylinder head: 137.9–138.1 mm.
Attention! The cylinder head and engine block can be processed in total by a maximum of 0.2 mm.
(Data taken from this portal nissanbook.ru)