J 9666 Valve Spring Tester
• | Improper installation |
• | Warped cylinder head |
• | Missing or not fully seated dowel pins |
• | Low torque on the cylinder head bolts |
• | Incorrect length cylinder head bolts |
• | A warped engine block surface |
• | Scratched surfaces |
• | Foreign material |
• | Cracked engine block threaded holes |
• | The gasket surfaces |
• | Do not use a motorized brush on the head gasket sealing surface. |
• | Valve stems and valve heads |
• | The bolt hole threads |
• | Remove all dirt, debris, or threadlocking material from the bolt holes. |
Important: Do not attempt to weld the cylinder head. If the cylinder head is damaged, replace the cylinder head. Minor nicks may be repaired with a fine flat file or emery cloth.
12.1. | Lift the valve off the valve seat. |
12.2. | Apply a dab of blue dye to the valve face. |
12.3. | Seat and rotate the valve. The blue dye traces transferred to the valve seat are an indication of concentricity of the valve seat. |
13.1. | Clean off the blue dye. |
13.2. | Apply blue dye to the valve seat. |
13.3. | Seat and rotate the valve. |
13.4. | The traces of blue dye transferred to the valve indicates valve runout. |
• | Grooving (1, 2) |
• | Bent valve stem (3). Replace any bent valve. |
• | Burrs or scratches (4). Minor burrs or scratches may be removed with a fine oil stone. |
• | Chipped or worn key grooves (5). Replace if damaged. |
• | Valve tip wear (6). Replace if worn. |