The valve guide K 27112 is the precision bore that locates and stabilizes the valve stem inside the Sulzer ZV40/48 cylinder head or valve housing, ensuring consistent axial movement and correct seating geometry. Typically made from hardened, wear-resistant material (often bronze or coated steel) and finished to tight tolerances, the guide controls oil film, limits lateral play and helps dissipate heat from the valve stem. Wear, scoring or increased clearance in the guide leads to valve wobble, poor sealing and accelerated seat wear — monitoring guide condition and replacing or re-bushing K 27112 when limits are reached preserves valve life and combustion consistency.