Check the valve clearance.
If necessary, adjust the valve clearance by replacing the tappets.
Other information:
Removel
1.
Remove wheel nuts, wheel and tire (A) from hub.
Tightening torque:
107.9 - 127.5 N·m (11.0 - 13.0 kgf·m, 79.6 - 94.0 lb·ft)
...
Inspection
1.
Visually check the pipes, hangers and connections for severe corrosion,
leaks or damage.
2.
Check for unusual exhaust sounds or abnormal exhaust fumes.
...