Service Manual

diameter of the hole after reaming will be
9.300-9.315mm (.3661-.3667 in.) on both
intake and exhaust.
C. Use the valve guide installer, part num-
ber 81-4880, to drive in the new oversize
valve guides. part number 81-3830. Drive
the guides in from the valve cover side of
the head. When properly installed, there
will be
27.5 mm (1.08 in.) clearance
between the end of the valve guide and
the gasket surface of the head. See Fig.
Replacement
4-45.
Guides
27.5 mm (1.08 in)
Fig u re 4-45
D. Check the I.D. of the new guidesagainst
the diameter
of the valve systems. If the
clearance is too small:
intake guide
less than
.025 mm (.001 in.)
exhaust guide
less than ,045 mm (.0017 in.).
you must ream the guide with valve
guide reamer, part number
41-4840. This
will enlarge the valve guide diameter to
5.5 mm (.2165 in.)
REASSEMBLY
Piston, Rings and Connecting Rod
1. Use a ring expander to install three piston
rings. The top ring is chrome plated, the
second ring is plain iron and the third is an
oil control ring. See Fig. 4-46.
Figure 4-46
2. The letter “N” on each piston ring should
face toward the top of the piston.
3. Before installing the piston, check the
match marks
on the rod cap and rod. This
will ensure correct installation.
Also note
the arrow
on the connecting rod, this should
point to the push rod side of the engine on
installation. See Fig. 4-47.
Figure 4-47
4. Lubricate the crankshaft with 30 weight oil
and slide it into the ball bearing. Take care
not to damage the seal. Lubricate the piston
and install it with a piston ring compressor.
See Fig. 4-48.
Figure 4-48
5. The arrow on the face of the piston should
point the same direction as the arrow on the
connecting rod toward the push rods.
See Fig. 4-49.
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