Damper Strut

Check for oil leakage.
Move the piston rod up and down to check that it operates smoothly without any binding.
Play of piston rod
- Measure the play as follows:
  Fix outer shell and fully extend the rod. Set a dial gauge at the end of rod: L [10 mm (0.39 in)], then apply a force of W [20 N (2 kgf, 4 lb)] to threaded portion. With the force of 20 N (2 kgf, 4 lb) applied, read dial gauge indication: P₁ . Apply a force of 20 N (2 kgf, 4 lb) in the opposite direction of "W", then read dial gauge indication: P₂ .
  
  Fig 1: Measuring Piston Rod Play
  Courtesy of SUBARU OF AMERICA, INC.
  
  Limit of play (P ₁ + P ₂ )
  
  0.8 mm (0.031 in)
  
  If the play is greater than limit, replace the strut.