WARMING THE ENGINE…
Platform-deep guides — crankhub, timing, the specifics of each motor, sourced from the factory documents.
Factory torque specs, special tools, and honest job sequences for the B58 vibration damper, chain tensioner, and timing chain — from ISTA, including the B58TU one-piece chain drive.
B58Which BMW turbo six you have, what its crankhub and timing drive actually are, and what the factory data says fails-and-gets-replaced — per engine.
N54N55S55B58S58Factory head-bolt torque stages for N54 and B58 (both bolt grades), the torque-to-yield law, the retorque question answered honestly, and the machining and flatness limits for these heads.
N54N55S55B58Factory torque specs, special tools, and honest job sequences for the N54 crankhub, vibration damper, timing chain, and VANOS adjusters — from ISTA.
N54Factory torque specs, special tools, and honest job sequences for the N55 crankhub, vibration damper, timing chain, and VANOS gear bolts — from ISTA.
N55Factory ring-gap and side-clearance tables for N54, N55 and B58, the file-fit process that gets them there, ring staggering by the clock, and piston-to-wall numbers you can measure.
N54N55B58Factory bearing clearance windows and journal grades for N54, N55, S55 and B58, the color and letter classification systems, plastigage done right, and every bottom-end torque stage.
N54N55S55B58Factory torque specs, grip-disc law, special tools, and honest job sequences for the S55 crankhub, damper, timing chain, and VANOS adjusters — from ISTA.
S55What the ISTA data actually carries for the S58 — damper, chain, tensioner, and VANOS numbers via its B58TU architecture, stated honestly.
S58What wears in the N54/B58 valvetrain, the factory answer on valve adjustment (nothing to set), cam and valve spec tables, valve-guide economics, and the timing pieces pairing with our crankhub guides.
N54N55S55B58