A Series Diesel Engine Base Engine Components 213
Polish the gasket surface with 400 grit paper.
Use an orbital sander or sanding block to keep a flat
surface.
Inspect the valve guides for scuffing or scoring.
Measure the valve guide bore.
Maximum Diameter
8.025 mm [0.3160 in]
Worn Limit: 8.1 mm [0.319 in]
Inspect the head surface for nicks, erosion, or any
other damage.
Check for head distortion as illustrated.
Standard: 0.03 mm [0.0012 in]
Worn Limit: 0.15 mm [0.0059 in]
Refer to the Salvage Manual if head distortion exceeds
limits.
Polish the valve stem with crocus cloth.
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