Measurement Value Validity Valve spring free length (mm) 44.1 2.0 JTD 115 HP Length of valve springs under a load of 22.80 ÷ 25.20 daN (mm) 34.0 2.0 JTD 115 HP Length of valve springs under a load of 43.90 ÷ 48.10 daN (mm) 25.5 2.0 JTD 115 HP