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Home >> Subaru >> 2017 >> Legacy 3.6R Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical (H4DO)) >> Cylinder Head >> Inspection >> Valve Spring

Valve Spring

WARNING: This page is about a different variant/trim than selected.
  1. Check the valve spring for damage and deformation.
  2. Using a caliper gauge, valve spring tester, surface plate and try square, check the valve spring free length, tension/spring height and squareness. If it is not within the standard, replace the valve spring.
NOTE:
  • Measurement should be performed at a temperature of 20°C (68°F).
  • To check the squareness of the valve spring, stand the valve spring on a surface plate and check its deflection at the top of the valve spring using a try square.
Fig 1: Checking Valve Spring Free Length
G08317135Courtesy of SUBARU OF AMERICA, INC.

Valve spring free length: 

CVT model 

Standard 

41.68 mm (1.641 in) 

MT model 

Standard 

41.06 mm (1.617 in) 

Valve spring tension/spring height: 

CVT model 

Set 

Standard 

182 - 210 N (18.56 - 21.41 kgf, 40.92 - 47.22 lbf)/33.0 mm (1.299 in) 

Lift 

Standard 

502 - 554 N (51.19 - 56.49 kgf, 112.87 - 124.56 lbf)/22.0 mm (0.866 in) 

MT model 

Set 

Standard 

182 - 210 N (18.56 - 21.41 kgf, 40.92 - 47.22 lbf)/33.0 mm (1.299 in) 

Lift 

Standard 

552 - 610 N (56.29 - 62.20 kgf, 124.11 - 137.15 lbf)/22.0 mm (0.866 in) 

Valve spring squareness: 

Standard 

2.5°, 1.8 mm (0.071 in) or less