Component                                         Fastener Size                              Type Torque    

Cylinder Head Bolts	M11 x 1.5 x 188, class 13.9	30 Nm → 50 Nm → +180° → +180°	B38 / B48 / B58	Use new bolts. Current replacement hardware.
Main Bearing Bolts	M10 x 1.5	25 Nm → +60° → +60°	B38 / B48 / B58	Use new bolts. Same shared B-series hardware; quantity varies by engine.
Connecting Rod Bolts	Current OEM rod bolt	20 Nm → +70°	B38 / B48 / B58	Use new bolts; lightly oil threads only where BMW procedure specifies. Shared-hardware rule.
Oil Squirter Bolts	OEM fastener	8 Nm	B38 / B48 / B58	Same value where the same squirter fastener is fitted.
Camshaft Bearing Cap Bolts	M6 class 8.8	9.6 Nm	B38 / B48 / B58	Identify bolt property class.
Camshaft Bearing Cap Bolts	M6 class 10.9	11.8 Nm	B38 / B48 / B58	Identify bolt property class.
VANOS / Cam Central Valves	Later M21 / M22 hardware	50 Nm → 140 Nm	Bx8 using this current hardware	Oil threads and contact surface where specified. Hardware-dependent.
Timing Chain Guide Bolts	OEM guide fastener	12 Nm	B38 / B48 / B58	Shared Bx8 timing architecture where same guide hardware is used.
Timing Chain Idler Sprocket	OEM fastener	25 Nm	Bx8 where fitted	Component/hardware must match.
Timing Chain Tensioner / Housing Bolt	OEM fastener	25 Nm	B38 / B48 / B58 where same hardware is fitted	Some BMW procedures distinguish tensioner body, housing, or cap; identify the fastener before use.
Timing Cover Bolts	M6 / small cover bolts	12 Nm	B38 / B48 / B58	Use for matching small timing-cover hardware.
Timing Cover Bolts	M8	25 Nm	B38 / B48 / B58 where fitted	Use only for matching M8 hardware.
Timing Cover Bolts	M10	45 Nm	B38 / B48 / B58 where fitted	Use only for matching M10 hardware.
Oil Pump to Engine / Housing Bolts	OEM M6-type pump fastener	12 Nm	B38 / B48 / B58 where same hardware is fitted	Combined oil/vacuum pump architecture varies by revision; match fastener.
Oil Pump Pickup / Suction Pipe Bolts	OEM fastener	12 Nm	B38 / B48 / B58 where fitted	Match current hardware.
Oil Pan Bolts	OEM small pan bolts	12 Nm	B38 / B48 / B58 where same hardware is fitted	Tighten evenly in sequence.
Valve Cover Bolts	OEM fastener	10 Nm	B38 / B48 / B58 where same hardware is fitted	Tighten evenly in sequence.
Intake Manifold Bolts	M6 / matching current hardware	10 Nm	B38 / B48 / B58 where same hardware is fitted	Current BMW-derived B48 procedure supports 10 Nm; use shared-hardware rule.
Exhaust Manifold Nuts	OEM nut / stud hardware	30 Nm	B38 / B48 / B58 where same hardware is fitted	Verify hardware before applying across revisions.
Rear Main Seal Housing Bolts	OEM fastener	12 Nm	B38 / B48 / B58 where same housing fastener is fitted	Clean sealing surfaces.
Crankshaft Position Sensor Bolt	OEM fastener	10–11 Nm	B38 / B48 / B58	Source sets vary 10–11 Nm by application; match exact fastener before publication.
VVT / VANOS Solenoid Bolt	OEM small fastener	10 Nm	B38 / B48 / B58 where fitted	Not the VANOS central valve.
Flywheel / Flexplate Bolts	Transmission/application dependent	VERIFY BEFORE WEBSITE RELEASE	B38 / B48 / B58	Do not publish a generic value until current manual/automatic fastener sets are separated.
Crankshaft Hub / Pulley Central Bolt	Hub/revision dependent	VERIFY BEFORE WEBSITE RELEASE	B38 / B48 / B58	Conflicting procedures exist by hub/timing operation. Keep off public chart until current hardware is resolved.