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Measure Dimension (mm) 0.460-0.609 Cylinder Head Gasket Thickness (mm) 1.52 Piston Clearance (mm) 0.71-0.81 VALVE SERVICE This procedure is done with the engine cylinder head removed from the block. DISASSEMBLY 1. Remove the engine cylinder head from the cylinder block (Refer to 9 - ENGINE/CYLINDER HEAD - REMOVAL). 2. Use Valve Spring Compressor Tool and compress each valve spring. 3. Remove the valve locks, retainers, and springs. 4. Use a smooth stone or a jewelers file to remove any burrs on the top of the valve stem, especially around the groove for the locks. 5. Remove the valves, and place them in a rack in the same order as removed. VALVE CLEANING 1. Clean all carbon deposits from the combustion chambers, valve ports, valve stems, valve stem guides and head. 2. Clean all residue and gasket material from the engine cylinder head machined gasket surface. INSPECTION 1. Inspect for cracks in the combustion chambers and valve ports. 2. Inspect for cracks on the exhaust seat. 3. Inspect for cracks in the gasket surface at each coolant passage. 4. Inspect valves for burned, cracked or warped heads. 5. Inspect for scuffed or bent valve stems. 6. Replace valves displaying any damage. 7. Check valve spring height. VALVE SEAT REFACING 1. Install a pilot of the correct size in the valve guide bore. Reface the valve seat to the specified angle with a good dressing stone. Remove only enough metal to provide a smooth finish. 2. Use tapered stones to obtain the specified seat width when required. 9 - 1610 ENGINE - 2.8L DIESEL KJ |