G643 (E) Service Manual Chapter 3. Engine Mechanical System 90
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.
Figure 12-59 Cutaway Scale
Figure 12-60 Measuring Valve Spring Installed Height
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.
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