Valve Springs Inspection

Reference: VALVES AND CYLINDER HEADS REMOVAL AND INSTALLATION 

Reference: VALVES AND CYLINDER HEADS DISASSEMBLY AND REASSEMBLY 

• Referring to data given below, check to be sure that each spring is in sound condition, free of any evidence of breakage or weakening. Remember, weakened valve springs can cause chatter, not to mention possibility of reducing power output due to gas leakage caused by decreased seating pressure.
  Fig 1: Inspecting Valve Springs Tension

  Courtesy of SUZUKI OF AMERICA CORP.

  Valve spring free length 

  Standard: 51.13 mm (2.0130 in.) 

  Valve spring preload 

  Standard: 209-241 N (20.9-24.1 kg, 46.1-53.1 lb) for 37.60 mm (1.480 in.) 

  Limit: 192 N (19.2 kg, 42.24 lb) for 37.60 mm (1.480 in.) 

• Spring squareness

  Use a square and surface plate to check each spring for squareness in terms of clearance between end of valve spring and square. Valve springs found to exhibit a larger clearance than limit given below must be replaced.

  Valve spring squareness limit 

  2.2 mm (0.087 in.) 

  Fig 2: Checking Spring Squareness

  Courtesy of SUZUKI OF AMERICA CORP.