Service Manual

2.15
MAINTENANCE
2
16. Loosen the jam nut and turn the lash adjuster until the valve
lash is correct.
17. Set the intake and exhaust valve lash to specification.
18. Hold adjuster and torque the jam nut using a torque wrench
w/10 mm crow’s foot adaptor. Verify clearance is still
correct after tightening the jam nut.
19. Turn the drive clutch counter-clockwise to rotate the cam
sprocket 225° to the PTO (#2) Adjustment Position.
20. Set the PTO cylinder valve lash by placing the feeler gauge
blade between the lash adjuster and valve as shown.
21. Repeat steps 16-18.
22. Clean sealing surfaces of the cylinder head and valve cover.
23. Inspect the condition of the valve cover bolt rubber
isolators. If rubber has become hardened or cracked,
replace them.
24. Install a new valve cover seal and install the valve cover.
Torque the cover bolts to specification.
25. Install the upper right-hand frame support and torque the
(4) mounting bolts to specification.
26. Reassemble vehicle by reversing this procedure. Start the
engine to ensure proper valve adjustment was performed.
Compression and Leakdown Tests
NOTE: This engine does NOT have decompression
components. Compression readings will vary in
proportion to cranking speed during the test.
Smooth idle generally indicates good compression. Low engine
compression is rarely a factor in running condition problems
above idle speed. Abnormally high compression can be caused
by worn or damaged exhaust cam lobes.
A cylinder leak-down test is the best indication of engine
condition. Follow tester manufacturer’s instructions to perform
a cylinder leak-down test. (Never use high pressure leakage
testers as crankshaft seals may dislodge and leak).
= In. / mm.
Intake Valve Clearance: .006 in. (.15 mm)
= In. / mm.
Exhaust Valve Clearance: .009 in. (.23 mm)
= T
Rocker Jam Nut: 71-89 in. lbs. (8-10 Nm)
PTO (#2)
Adjustment Position
Timing Marks at PTO (#2)
Adjustment Position
PTO (#2)
= T
Valve Cover Bolts:
89 in. lbs. (10 Nm)
= T
Upper Right-Hand Frame Support Bolts:
36 ft. lbs. (49 Nm)
Measured Cylinder Compression
210-250 psi (full throttle)
Cylinder Leakage Service Limit: 10%
(Inspect for cause if leakage exceeds 10%)