Exhaust Valve Rocker Assembly

WARNING: This page is about a different variant/trim than selected.

Measure the inner diameter of valve rocker arm and outer diameter of valve rocker shaft, and confirm the difference (oil clearance) between the two values.
Clearance between arm and shaft:

Standard:

0.020 - 0.054 mm (0.0008 - 0.0021 in)

Fig 1: Measuring Inner Diameter Of Valve Rocker Arm
Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Measuring Outer Diameter Of Valve Rocker Shaft
Courtesy of SUBARU OF AMERICA, INC.
If the oil clearance exceeds the limit, replace the valve rocker arm or shaft, whichever shows the greater amount of wear.
Rocker arm inside diameter:

22.020 - 22.041 mm (0.8669 - 0.8678 in)

Rocker shaft diameter:

21.987 - 22.000 mm (0.8656 - 0.8661 in)
If the roller or valve contact surface of valve rocker arm is worn or dented excessively, replace the valve rocker arm.
Check that the valve rocker arm roller rotates smoothly. If not, replace the valve rocker arm.