Valve Guides; Valve Stem-To-Guide Clearance; Valve Guide Reamer Sizes; Measuring Valve Seat Runout - Jeep J-10 Series 1982 Technical & Service Manual

60118
Fig. 1B-50 Measuring Valve Seat Runout
Valve Guides
The valve guides are an integral part of the cylinder
head and are not replaceable. When the stem-to-guide
clearance is excessive, ream the valve guide bores to
accommodate the next larger oversize valve stem. Over
size service valves are available with 0.003-inch (0.076
mm), 0.015-inch (0.381 mm), and 0.030-inch (0.762 mm)
stem diameter sizes. Refer to Valve Guide Reamer Sizes
chart for reamer sizes.
Valve Guide Reamer Sizes
Reamer
Tool Number
Size
J-6042-1
J-6042-5
J-6042^
0.003-inch (0.076 mm)
0.015-inch (0.381 mm)
0.030-inch (0.762 mm)
60260
NOTE: Ream valve guides in steps, starting with the
0.003-inch (0.076 mm) oversize reamer and progressing
to the size required.
Valve Stem-to-Gulde Clearance
Valve stem-to-guide clearance may be measured by
either of the following two methods.
Preferred Method:
(1) Remove valve from head and clean valve guide
bore with solvent and bristle brush.
(2) Insert telescoping gauge into valve guide bore
approximately 3/8 inch (9.525 mm) from valve spring
side of head (fig. 1B-51) with contacts crosswise to cylin
der head. Measure telescoping gauge contacts with
micrometer.
(3) Repeat measurement with contacts lengthwise
to cylinder head.
GAUGE
3/8-INCH *J u
(9.525 mm) In I
ENGINES 1B-35
80303
Fig. 1B-51 Valve Stem-to-Gulde Clearance Measurement
with Telescoping Gsuge
(4) Compare crosswise to lengthwise measurements
to determine out-of-roundness. If measurements differ
by more than 0.0025 inch (0.064 mm), ream guide bore to
accommodate oversize valve stem.
(5) Compare valve guide bore diameter with diame
ter listed in Specifications. If measurement differs more
than 0.003 inch (0.076 mm), ream guide to accommodate
oversize valve stem.
Alternate Method:
(1) Use dial indicator to measure lateral movement
of valve stem with valve installed in its guide and barely
off valve seat (fig. 1B-52).
(2) Correct clearance is 0.001 to 0.003 inch (0.025
mm to 0.076 mm). If indicated movement exceeds ac
ceptable clearance, ream guide to accommodate oversize
valve stem.
Fig. 1B-52 Valve Stem-to-Gulde Clearance Measurement
with Dial Indicator