Valve dimensions, Valve spring squareness, free length and tension, Cylinder head assembly – Generac 86640 User Manual
Page 36
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
Valve Dimensions
Check dimensions of all valves. Refer to the appropriate
SPECIFICATIONS chart.
Figure 34. Valve Dimensions
T (Margin thickness!
NOTE: When the valve head Is worn to 0.020Inch (0.5mm)
margin thickness, replace the valve. Grinding allowance
for valve stem end surface Is 0.008 Inch (0.2mm) or less.
Valve Spring Squareness, Free Length
and Tension
Valve spring out-of-squareness must not exceed 0.079
inch (2.0mm). Refer to appropriate SPECIFICATIONS chart
for spring free length and tension.
Cylinder Head Assembly
1. Install valve oil seal. Then, install valve component parts.
Apply engine oil to camshaft oil seal and install the seal.
2. Install camshaft assembly. Note positioning of camshaft
front face when No. 1 cylinder is at top dead center (TDC) of
its compression stroke.
3. Measure camshaft end play with thermostat housing and
gasket installed.
5. Install bolt stoppers. Always use NEV\/ bolt stoppers. See
Figure 40, next page.
Page 2.3-4