KPMI CUSTOM VALVE GUIDES SEALS(4)

Solid PTFE, with metal band and choker spring. Stem diameter: 3/8" (0.375"), valve guide diameter: 0.500"; overall length of seal: 0.507"; outside diameter of seal: 0.600". Kibblewhite Precision Machining custom valve stem seals are a quality product and suitable for any and all custom applications. Note: The valve stem diameters listed below are for reference only. - 36-84 B.T. = 3/8" (0.3750") - 57-83 XL intake = 0.3090" - 57-83 XL exhaust = 0.3384" - 84-04 B.T.; 86-03 XL = 5/16" (0.311") - 05-16 TCA/B; 04-22 XL; 08-12 XR = 7mm (0.2760") - 02-17 V-Rod = 6mm (0.2345") - 17-24 M8 = 6mm (0.2345") Installation note: Valve guides made of PTFE require a different installation technique than 'regular' or non-PTFE valve guides due to the PTFE material. They are typically 0.020” (0.50mm) smaller than the valve stem and guide top they are designed to fit. - The guide top should have a decent chamfer - The valve stem should have a decent chamfer, but a Mylar seal installation protector / installation capsule (501823 green 5/16" / 0.3125", 501824 Yellow 11/32" / 0.34375", 501825 3/8" / 0.375") is recommended for easier installation over the valve stem - You have to roll the seal around the valve tip while applying downward pressure to get it started - Do not push directly on the very top of the seal to get it onto the guide, as this will collapse the sealing area and tear the seal - A 12-point 12mm socket catches the shoulder of the guide well and can be used to push the seal onto the guide until it bottoms out. The choker wire around the sealing area and the band around the area that fits the guide, combined with the hardness of the material itself, make the seal a tight fit and slightly harder to install than regular Viton seals. PTFE material does not have 'memory' and is therefore subject to creep. This creep allows the seal to conform to mating surfaces. Due to the 'creep' characteristic, the seal relaxes slightly after installation and does not drag on the valve stem as hard as it does during installation. The twin-spring design provides continuous tension on the valve guide and the valve stem of the valve throughout its service life.