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 damper, chain tensioner, and timing chain — from the factory service documentation, with 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.
N54N55S55B58S58The crank bolt capture install on N54/N55/S55: what a capture does and doesn't fix, the bolt-head clocking problem, kit torque specs, and why it belongs on the hub job.
N54N55S55The N54/N55/S55 crankhub aftermarket, sorted: what actually fails, what pinned and splined conversion kits really demand of the installer, what they cost, and which fix fits which car.
N54N55S55The HCR head stud install on the N54 and N55: the kit variants, the M9-to-M11 machining numbers, the extended-thread Long kit, the torque ladder, and the honest re-check answer.
N54N55S55B58Factory 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 the factory service documentation.
N54Factory torque specs, special tools, and honest job sequences for the N55 crankhub, vibration damper, timing chain, and VANOS gear bolts — from the factory service documentation.
N55The pinned crankhub install on N54/N55/S55: the foil-shimmed drill jig, the carbide law, depth stops, chip control with the pan off, and the factory torque-plus-angle that finishes it.
N54N55S55Factory 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 the factory service documentation.
S55What the factory data actually carries for the S58 — damper, chain, tensioner, and VANOS numbers via its B58TU architecture, stated honestly.
S58The splined crankhub install on N54/N55/S55: the old-bolt press, the 75 ft-lb stage, factory torque-plus-angle, the bolt-capture companion, and the verification checklist.
N54N55S55What 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.
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