Very dirty - required extensive cleaning. Replaced functional seals/o-rings. Shims clean/inspected - replaced as needed. Polished shaft. Honed body. Found additional spacers had been added previously - no change during service. Replaced seal head assembly. Went out: Spring installed length 181mm R-18 Dyno Ran KL/BRST BM4360 117635 Came in with R - 15. Spring installed length 212mm. Very dirty - required extensive cleaning. Replaced functional seals/o-rings. Shims clean/inspected - replaced as needed. Found shaft had chips in surface. Replaced shaft. Honed body. Found additional spacers had been added previously. Replacement shaft shorter than original - Replaced adjuster rod and matched spacer set up. Replaced seal head assembly. Rebuilt hydaulic preload adjuster Went out: Spring installed length 212mm R-14 Dyno Ran KL/BRST