Valve Spring

1. Check the free height of each valve spring and replace if necessary.
2. Using a square, test the squareness of each valve spring. If the spring is excessively out-of-square, replace it.

Valve spring 

Standard value

Free height: 46.4 mm (1.8268 In.)

Load : 24 kg / 37.9 mm (53 lb / 1.492 In.)

Out-of-square: Max. 2°

Service limit

Free height: 45.4 mm (1.7874 In.)

Out-of-square: Max 4°

Fig 1: Checking Valve Springs

Courtesy of KIA MOTORS AMERICA, INC.