ReferenceN54 N55 S55 B58 S58

Torque specs master index: every number in the wiki, one table

The one-lookup torque index for N54, N55, S55, B58, S58 — head bolts, crankhub bolts, VANOS, tensioners, plugs, drains, and the one-time-use laws, every factory row cited and community rows labeled.

9 min readUpdated 2026-10-21Rapid Racing

Every torque that appears anywhere in this wiki, on one page: the component, the engine, the number, and the guide that owns the context — the sequence, the one-time-use law, the gotcha that makes the number safe to use. This is the mechanic's one-lookup. Two laws before you lean on it. First: a number without its angle is half a spec — every + angle row below is a torque-plus-angle fastener, and the angle is the load, the torque is just the door. Second: replace-means-replace — where the row says renew or replace, the fastener is torque-to-yield or single-use by the factory's own instruction, and a released bolt goes in the bin.

The crankhub and damper — the spine

Component	Engine	Thread	Torque	Owner
Hub (torsion damper) to crankshaft, central bolt	N54/N54T	`M16x80` 12.9	100 Nm + 360°, replace, light oil	n54-crankhub-and-timing-guide
Vibration damper ring to hub, ASA screws	N54/N54T	`M8x16`	35 Nm	n54-crankhub-and-timing-guide
Hub to crankshaft, central bolt	N55	`M18x108` 12.9	100 Nm + 270°, replace, light oil	n55-crankhub-and-timing-guide
Vibration damper to hub, screws 10.9	N55	`M8x16`	35 Nm	n55-crankhub-and-timing-guide
Hub to crankshaft, central bolt	S55	`M18x108` 12.9	100 Nm + 270°, replace, light oil	s55-crankhub-and-timing-guide
Vibration damper to hub, screws 10.9	S55	`M8x20`	20 Nm + 90°, replace	s55-crankhub-and-timing-guide
Vibration damper to crankshaft	B58	`M10x65` ×4	40 Nm + 120°, renew screws	b58-crankhub-and-timing-guide
Vibration damper to crankshaft	S58	`M10x65` ×4	40 Nm + 120°, renew screws	s58-crankhub-and-timing-guide
Belt pulley to damper	S58	`M10`	40 Nm	s58-crankhub-and-timing-guide
Chain tensioner pre-tension (tool `11 9 340` + `00 9 250`)	N54	—	0.6 Nm during the timing set	n54-crankhub-and-timing-guide

Factory service documentN54 crankhub central bolt — 100 Nm + 360°, single-useOpens in your account's service knowledge — sign-in required.

Head and block — the TTY population

Component	Engine	Thread	Torque	Owner
Cylinder head bolts	N54	`M11x135`	30 Nm + 90° + 90° + 45°, renew	head-gasket-and-tty-bolts
Cylinder head bolts	N54	`M9x95/125`	30 Nm + 90° + 90° + 45°, renew	head-gasket-and-tty-bolts
Cylinder head bolts	N54	`M9x30/70`	22 Nm	head-gasket-and-tty-bolts
Head bolt, grade 13.9 (13 mm head height)	B58	`M11x1.5x188`	30 Nm + 50 Nm + 90° + 90° + 90° + 90°, renew	head-gasket-and-tty-bolts
Head bolt, grade 11.9 (11 mm head height)	B58	`M11x1.5x188`	30 Nm + 90° + 90° + 90°, renew	head-gasket-and-tty-bolts
Head bolt to timing case cover	B58	`M8x40`	19 Nm, renew	head-gasket-and-tty-bolts
Cylinder head cover to head	N54	`M6`	8.5 Nm, crosswise, inside-out	head-gasket-and-tty-bolts
Cylinder head cover to head	N55	`M6`	8.5 Nm	valve-cover-and-gasket-guide
Cylinder head cover to head	B58 rev 0	`M6x27`	8 Nm then 11 Nm, two-stage	valve-cover-and-gasket-guide
Cylinder head cover to head	B58 (G30/G32/G01 family)	`M6x30`	8 Nm then 11 Nm, two-stage	valve-cover-and-gasket-guide
Head studs, full 14-stud sequence (aftermarket, OURS)	N54	M11 studs	40 / 90 / 130 Nm by stage	hcr-head-stud-install-guide

The head-stud row is ours, not the factory's — the aftermarket stud kit carries its own sequence, and the guide owns the TTY-versus-stud honesty. Everything else in this table is factory-cited.

Bottom end

Component	Engine	Thread	Torque	Owner
Connecting rod bolts	N54/N55/B58	`M9`	20 Nm + 70° + 70°, replace, wash and oil	rod-and-main-bearings
Main bearing bolts (steel 10.9)	N54	`M10x100`	20 Nm + 70°, replace	rod-and-main-bearings
Bedplate screws (aluminum)	N54	`M10x27`	15 Nm + 90°, replace	rod-and-main-bearings
Bedplate screws (aluminum)	N54	`M10x41`	15 Nm + 90°, replace	rod-and-main-bearings
Bedplate screws (aluminum)	N54	`M8x37`	10 Nm + 90°, replace	rod-and-main-bearings
Oil pump to bedplate	S55	`M8x123`	10 Nm + 180°, replace, Al helicoil repairs only	s55-crankhub-and-timing-guide

Factory service documentN54 connecting rod bolts — 20 Nm + 70° + 70°, single-useOpens in your account's service knowledge — sign-in required.

The aluminum-bedplate rows carry their own law: thread repairs by aluminum Helicoil only — a steel insert in that joint sets up a corrosion couple the factory explicitly rules out.

Timing drive, VANOS, tensioners

Component	Engine	Thread	Torque	Owner
VANOS adjuster to camshaft, central bolts	N54/N54T	`M10x94`	20 Nm + 180°, replace	n54-crankhub-and-timing-guide
VANOS with sensor gear to camshafts	N55	`M10x94`	20 Nm + 180°, replace	n55-crankhub-and-timing-guide
VANOS gear to intake/exhaust camshafts	B58/S58	`M10x1`	30 Nm + 90°, renew central bolt	b58-crankhub-and-timing-guide
VANOS central valve to camshaft	B58	`M20x1.5`	10 → 30 → 50 Nm + 35°, staged	b58-crankhub-and-timing-guide
VANOS central valve	S58	`M20x1.5`	5 Nm initial, 30 → 50 Nm + 30°	s58-crankhub-and-timing-guide
Chain tensioner to cylinder head	N54	`M22x1.5`	55 Nm, new ring, never retighten	valvetrain-and-timing-refresh
Chain tensioner to cylinder head	N55/S55	`M22x1.5`	55 Nm	n55-crankhub-and-timing-guide
Chain tensioner (G11 procedure set)	B58	`M22x1.5`	20 Nm + 30°, new sealing sleeve	valvetrain-and-timing-refresh
Chain tensioner (G20 procedure set)	B58/S58	`M22x1.5`	20 Nm + 40°, new sealing sleeve	b58-crankhub-and-timing-guide
Chain drive module to cylinder head	N55/S55	`M6x35`	8 Nm	n55-crankhub-and-timing-guide
Guide rail to crankcase	N55/S55	`M8`	20 Nm	n55-crankhub-and-timing-guide
Guide rail to cylinder head	N55/S55	`M7`	14 Nm	n55-crankhub-and-timing-guide
Camshaft sprocket to crankcase	B58/S58	—	108 Nm, clean thread	b58-crankhub-and-timing-guide
Bearing journal, tensioning/guide rails	B58/S58	—	20 Nm, replace journal	b58-crankhub-and-timing-guide
Bottom chain tensioner to crankcase	B58/S58	`M6x22`	9 Nm, clean thread	b58-crankhub-and-timing-guide
Rear timing case cover to crankcase	B58/S58	`M6x31`	8 Nm + 90°, renew screws	b58-crankhub-and-timing-guide
Camshaft bearing cap to head	N55	`M6x30.5`	8.5 Nm	n55-crankhub-and-timing-guide
Camshaft bearing strips (steel 10.9)	N55	`M7x70`	8 Nm + 60°, inserted dry	n55-crankhub-and-timing-guide
Eccentric shaft bearing cap	N55	`M6x27`	8.5 Nm	n55-crankhub-and-timing-guide
Screw plug in cylinder head	N55/S55	`M18x1.5`	25 Nm	n55-crankhub-and-timing-guide
Non-return valve VANOS	N55	`M14x1.5`	13 Nm	n55-crankhub-and-timing-guide
Oil vacuum pump to crankcase	B58	`M8`	15 Nm + 45°, renew	b58-crankhub-and-timing-guide

Factory service documentN54 VANOS to camshafts — 20 Nm + 180°, replace screwsOpens in your account's service knowledge — sign-in required.

Ignition, oiling, cooling, belt

Component	Engine	Thread	Torque	Owner
Spark plug, dry thread	N54/N55/B58	`M12x1.25`	23 ± 3 Nm	spark-plug-and-coil-guide
Spark plug, dry thread (larger thread)	other engines	`M14x1.25`	30 Nm	spark-plug-and-coil-guide
Ignition coil to cover/head	N54/N55/B58	`M6`	8 Nm	spark-plug-and-coil-guide
Engine oil drain plug	N54/N55	`M12x1.5`	25 Nm, new sealing ring	engine-oil-change-guide
Engine oil drain plug	S55 magnesium sump	`M16x1.5`	20 Nm, replace screw+ring	engine-oil-change-guide
Engine oil drain plug	S55 aluminium sump	`M16x1.5`	25 Nm, new ring	engine-oil-change-guide
Oil filter cap	N54/B58	—	25 Nm, O-ring lightly oiled	engine-oil-change-guide
Oil filter housing to head	N54	`M8x78/48/28`	22 Nm	oil-filter-housing-gasket-guide
Oil-coolant heat exchanger to OFH	N54	`M8x20`	16 Nm	oil-filter-housing-gasket-guide
Oil pressure line to crankcase	N54	`M8x12`	20 Nm	oil-filter-housing-gasket-guide
Oil feed to turbocharger	N54	`M6x12`	8 Nm	oil-filter-housing-gasket-guide
Oil return to crankcase	N54	`M12x10`	20 Nm	oil-filter-housing-gasket-guide
Coolant pump to crankcase	N54/N55	`M8x26`	10 Nm + 90°, replace, Al helicoil only	water-pump-and-thermostat-guide
Coolant pump to bracket	N54 (w/ bracket)	`M8x27` ASA	20.5 Nm	water-pump-and-thermostat-guide
Thermostat housing to pump	N54	`M6x25`	8 Nm	water-pump-and-thermostat-guide
Thermostat housing to pump	N54	`M8x16`	20 Nm	water-pump-and-thermostat-guide
Thermostat housing to holder	N55	—	9 Nm	water-pump-and-thermostat-guide
Coolant hose to cylinder head	N54	`M6x23`	9 Nm	water-pump-and-thermostat-guide
Hose clamps	N54/N55	`L42-48` / `L18-24`	3 Nm	water-pump-and-thermostat-guide
Belt tensioner w/ deflection pulley to block	N54	`M10x110` ISA	40 Nm	belt-and-tensioner-guide
Belt tensioner to crankcase (variants)	N54 family	`M10x90/103`	38 Nm	belt-and-tensioner-guide
Deflection pulleys (assorted)	N54 family	`M10` variants	38 / 40 / 56 / 60 Nm by variant	belt-and-tensioner-guide
Holder for deflecting element to sump	N54 family	`M10x37/30`	38 Nm	belt-and-tensioner-guide
VANOS solenoid valve holder to head	N54	`M6x12`	10 Nm	vanos-solenoid-service-guide
VANOS solenoid valve holder to head	N55	`M6x12`	9 Nm	vanos-solenoid-service-guide
VANOS solenoid valve to head	S55	`M6x12`	9 Nm	vanos-solenoid-service-guide

Factory service documentSpark plugs — 23 ± 3 Nm dry, all-engines tableOpens in your account's service knowledge — sign-in required.

Electrical and fittings

Component	Engine	Thread	Torque	Owner
Battery positive/negative leads, safety terminal, IBS	all	`M6`	5 Nm	battery-registration-guide
Power distribution box / fuse connections	all	`M8`	15 Nm	battery-registration-guide
Non-return valve to head	B58 family	`M16x1.5`	20 Nm	valve-cover-and-gasket-guide
Ventilation connection to head	B58 family	`M8x1`	15 Nm, new sealing ring	valve-cover-and-gasket-guide
Oil filler neck on cover	B58 family	`M6x20`	14 Nm, new sealing ring	valve-cover-and-gasket-guide

Front-seal service torques (N54) — the tool-driven rows

Step	Tool	Torque	Owner
Seal slackener screws (`11 9 224`)	run down to press seal inward ~1 mm	approx. 20 Nm	n54-crankhub-and-timing-guide
Seal puller (`11 0 371`) screwed into seal	—	80 Nm before drawing	n54-crankhub-and-timing-guide

Conversion-kit rows — OURS, the kits own their numbers

Component	Kit	Torque	Owner
Capture bolts on damper	VTT Crank Bolt Capture	40 ft-lb (~54 Nm) per kit sheet	crank-bolt-capture-install-guide
Capture bolts	Kies Crank Bolt Lock	40 Nm, star pattern, medium threadlocker	crank-bolt-capture-install-guide
New bolt pre-torque (splined hub)	vendor	~102 Nm (75 ft-lb) then vendor sequence	splined-crankhub-install-guide

These rows are the kits' own sheets, not factory data — labeled ours/community, because the factory never published a torque for a part it never made. The factory central-bolt rows above remain the law for stock hardware.

The wrench law

The 00 9 250 torque wrench row above carries its own spec worth knowing: measuring range 0.40–3.00 Nm, ±3% accuracy — because the 0.6 Nm chain pre-tension is beneath the floor of most click-type wrenches, and a tool that cannot resolve its own number cannot apply it. The special-tools-catalog decodes every tool number in this index; the spec sheets (n54, b58) carry each engine's full data tables with these torques in context.

Factory sources

Questions

What is the torque spec for the N54 crankhub bolt?

100 Nm plus a full 360° turn on the single-use M16x80 12.9 central bolt, lightly oiled. The N55/S55 bolt is M18x108 at 100 Nm + 270°. The B58/S58 have no central bolt — their dampers use four M10x65 screws at 40 Nm + 120°.

What is the torque spec for BMW spark plugs on the N54, N55, and B58?

23 ± 3 Nm on the M12x1.25 thread, dry — never lubricated — for all three engines, straight from the all-engines torque table. The M14x1.25 thread used on other engines carries 30 Nm.

Are BMW head bolts torque-to-yield?

Yes. Every head bolt row in this index is single-use: N54 M11 is 30 Nm + 90° + 90° + 45°, N54 M9 is 30 Nm + 90° + 90° + 45°, and the B58 splits by screw-head height — 13.9-grade at 30 + 50 Nm + 4×90°, 11.9-grade at 30 Nm + 3×90°.

What torque is the N54 oil drain plug?

25 Nm on the M12x1.5 plug with a new sealing ring every time. The S55 runs M16x1.5 plugs at 20 Nm on the magnesium sump and 25 Nm on the aluminium sump.