Valve Guides - Yale GDP16-20AF Maintenance Manual

600 YRM 496
b. Put plastic gauge material between each
camshaft journal and cap.
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.). Cor-
rect 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
Cylinder Head, Camshaft, and Valve Mechanism Repair
Do not allow
1. PLASTIC GAUGE
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.), re-
place 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 retain-
ing 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.).
Figure 11. Camshaft Check
2. SCALE
5