Measure 1 . Valve spring installed height of each spring as follows: A . Use a narrow thin scale. A cutaway scale may be helpful. B . Spring seat in the cylinder head to the top of the valve spring cap. C . If this measurement exceeds the amount in “Specifications,” install valve seat spring shims, approximately 1.58750 mm (0.0625 in.) thick, between the spring and cylinder head. NEVER shim the spring so as to give an installed height under the specified amount. Thermostat and Coolant Outlet Remove or Disconnect 1 . Bolts. 2 . Stud. 3 . Coolant outlet. 4 . Gasket. 5 . Thermostat (with gasket). Inspect • Coolant outlet for cracks. Install or Connect 1 . Thermostat 2 . New gasket. 3 .
Coolant outlet. NOTICE : Refer to “Notice” on page 1. 4 . Bolt. 5 . Stud. Tighten • Bolts to 28 N·m (21 lb· ft.). • Stud to 28 N·m (21 lb· ft.). Torsional Damper Inspect Torsional damper weight for signs of shifting on the hub. Replace as needed. The area of the torsional damper hub shaft that contacts the front crankshaft seal for roughness or nicks. Replace the damper if this condition exists. If damper is replaced, new damper weights of the same size must be installed on the new damper in the same location as the old damper. Figure 12-59 Cutaway Scale Figure 12-60 Measuring Valve Spring Installed Height G643 (E) Service Manual Chapter 3. Engine Mechanical System 90