600 SRM 496
Cylinder Head, Camshaft, and Valve Mechanism Repair
6.
Measure clearance between camshaft and bore in
cylinder head as follows:
a. Install camshaft in cylinder head.
b. Put plastic gauge material between each
camshaft journal and cap.
Do not allow
camshaft to rotate.
c.
Tighten capscrews for caps to 18 to 27 N•m
(13 to 20 lbf ft). See Figure 12.
Correct clearance for journals No. 1 and 5
is 0.035 to 0.085 mm (0.0014 to 0.0033 in.).
Correct clearance for journals No. 2, 3, and
4 is 0.065 to 0.115 mm (0.0026 to 0.0045 in.).
If any clearances are greater than 0.15 mm
(0.0059 in.), replace cylinder head assembly.
7.
Replace camshaft if there is any damage or if it
does not meet specifications.
1.
FRONT OIL SEAL SURFACE
2.
FRONT JOURNAL (NO. 1)
3.
CENTER JOURNALS (NOS. 2, 3, AND 4)
4.
REAR JOURNAL (NO. 5)
5.
FUEL PUMP LOBE
Figure 10. Camshaft Inspection
Figure 11. Camshaft Check
1.
PLASTIC GAUGE
2.
SCALE
Figure 12. Camshaft Clearance Measurement
Valve Guides
1.
Measure clearance between valve stems and
valve guides.
Normal clearance is 0.025 to
0.060 mm (0.001 to 0.002 in.).
If clearance is more than 0.20 mm (0.008 in.),
replace valve or valve guide.
2.
If replacement is necessary, remove seal from
valve guide(s). Then use tool to remove valve
guide(s).
3.
To install valve guide, install retaining ring on
valve guide. Use tool to install valve guide so
that retaining ring contacts cylinder head. See
Figure 13.
Correct height of valve guide above valve spring
seat is 19.1 to 19.6 mm (0.75 to 0.77 in.).
5
