Valve Springs Inspection

Reference: VALVES AND CYLINDER HEADS REMOVAL AND INSTALLATION 

Reference: VALVES AND CYLINDER HEADS DISASSEMBLY AND ASSEMBLY 

• 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 Spring

  Courtesy of SUZUKI OF AMERICA CORP.

  Valve spring free length 

  VALVE SPRING FREE LENGTH SPECIFICATION
  
  

  Item	Standard	Limit
  Inner	36.08 mm (1.4205 in.)	35.00 mm (1.3780 in.)
  Outer	40.44 mm (1.5921 in.)	39.22 mm (1.5441 in.)

  Valve spring preload 

  VALVE SPRING PRELOAD
  
  

  Item	Standard	Limit
  Inner	6.9 - 7.9 kg for 27.5 mm (15.2 - 17.4 lb/1.08 in.)	5.9 kg for 27.5 mm (13.0 lb/1.08 in.)
  Outer	15.4 - 17.8 kg for 31.7 mm (34.0 - 39.2 lb/1.25 in.)	13.3 kg for 31.7 mm (29.3 lb/1.25 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 

  Inner spring: 1.6 mm (0.063 in.) 

  Outer spring: 1.8 mm (0.071 in.) 

  Fig 2: Checking Valve Spring For Squareness

  Courtesy of SUZUKI OF AMERICA CORP.