8. Use a straight edge and feeler gauge to check the
flatness of the cylinder head lower surface (Fig. 63). Be
sure to check the surface variation crosswise, length-
wise, and diagonally. If the variation in surface flatness
exceeds (0.05 mm) 0.002 in. , the cylinder head or
cylinder block must be replaced or resurfaced.
Valve Guides
1. Use a micrometer and a small hole gauge to check
the valve guide to valve stem clearance. The valve and
valve guide should be replaced if the clearance exceeds
the following limits:
Valve guide to valve stem clearance
Intake valve: 0.10 mm (0.004 in.)
Exhaust valve: 0.15 mm (0.006 in.)
2. Use a valve guide removing mandrel with a pilot
section to remove the valve guide. Push the valve guide
up from the bottom of the cylinder head.
3. To install the new valve guide press it in from
the top
of the cylinder head, using the valve guide mandrel.
Install the valve guide so the installed height is 13.5 -
14.5 mm (0.531 - 0.571 in.) above
the cylinder head
(Fig. 64).
4. After installing the new valve guide, check the valve
guide to stem clearance. If the clearance is smaller than
standard, it will be necessary to ream the valve guide
bore to get the proper clearance.
Figure 63
Figure 64
Cylinder Head Overhaul Page 3 - 48 Reelmaster
®
223-D/5100-D
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