Damper Strut

WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

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.