Impreza WRX STI F4-2.5L DOHC Turbo (2007)
AUTOMATIC BELT TENSION ADJUSTER
1) Visually check the oil seals for leaks, and rod ends for uneven wear and scratches. If necessary, replace the automatic belt tension adjuster
assembly.
NOTE:
Slight traces of oil at rod's oil seal does not indicate a problem.
2) Check that the adjuster rod does not move when a pressure of 294 N (30 kgf, 66 lbf) is applied to it. This is to check the adjuster rod stiffness.
3) If the adjuster rod is not stiff and moves freely when applying 294 N (30 kgf, 66 lbf), check it using the following procedures:
(1) Slowly press the adjuster rod down to the end surface of cylinder. Repeat this operation two to three times.
(2) With the adjuster rod extended all the way up, apply a pressure of 294 N (30 kgf, 66 lbf) to it to inspect the stiffness of the adjuster rod.
(3) If the adjuster rod is not stiff and compresses downward, replace the automatic belt tension adjuster assembly.
CAUTION:
^
Always use a vertical type pressing tool to move the adjuster rod down.
^
Do not use a lateral type vise.
^
Push the adjuster rod vertically.
^
Press-in the push adjuster rod gradually taking three minutes or more.
^
Do not allow press pressure to exceed 9,807 N (1,000 kgf, 2,205 lbf).
^
Push in the adjuster rod to the end face of the cylinder. Do not push in the adjuster rod farther than the end face of the cylinder. Doing so
may damage the cylinder.
4) Measure the amount of rod protrusion "H" beyond the body. If it is not within specifications, replace with a new part.
5) Check the mating surfaces of timing belt and contact point of adjuster rod for uneven wear or scratches. Replace the automatic belt tension
adjuster assembly if faulty.
6) Check the belt tension pulley for smooth rotation. Replace if noise or excessive play occurs.
7) Check the belt tension pulley for grease leakage.
BELT IDLER
1) Check the belt idler for smooth rotation. Replace if noise or excessive play occurs.
2) Check the outer contacting surface of idler pulley for uneven wear and scratches.
3) Check the belt idler for grease leakage.
