Valve Springs Inspection

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: Checking Valve Spring Free Length & Valve Spring Preload
Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Valve Spring Free Length Specification Chart
Courtesy of SUZUKI OF AMERICA CORP.

Fig 3: Valve Spring Preload Specification Chart
Courtesy of SUZUKI OF AMERICA CORP.
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 4: Checking Spring Squareness
Courtesy of SUZUKI OF AMERICA CORP.