Mercedes Torque Specifications — Bolt Torques & Fastener Data

Mercedes‑Benz torque specifications are critical for safe and reliable assembly. Never guess torque values — always refer to the correct specification for your engine and fastener.

Torque values vary by engine family, fastener grade, and application — see tables below [PLACEHOLDER — confirm vs OEM workshop data]
Many critical fasteners use torque + angle (stretch bolt) method — angle is as important as torque [PLACEHOLDER]
Always use a calibrated torque wrench and follow the specified tightening sequence
Last verified: February 2026

Full specification tables, tightening sequences, common mistakes, and verification methods explained below.

Common Torque Specifications — Reference Table

The following table provides torque values for commonly serviced components across multiple Mercedes engine families. Always confirm the exact specification for your specific engine and model year.

Component	Torque (Nm)	Torque + Angle	Notes
Wheel bolts (steel wheels)	130 Nm	—	M12 x 1.5 bolts, dry thread
Wheel bolts (alloy wheels)	110–130 Nm	—	M12 x 1.5, check wheel type
Spark plugs — M111/M112/M113	25 Nm	—	Use anti‑seize on threads
Spark plugs — M271/M272/M276	28 Nm	—	Dry threads
Oil drain plug (all engines)	25–30 Nm	—	Replace crush washer each time
Oil filter housing (canister)	25 Nm	—	Hand‑tight + ¼ turn on some variants
Brake caliper mounting bolts	85–100 Nm	—	Use thread‑lock on some applications
Brake disc retaining screw	5–8 Nm	—	Light torque only
Control arm bolts (front)	70–90 Nm + 90°	Torque + angle	Load suspension before final tighten
Subframe mounting bolts	80–100 Nm + 90°	Torque + angle	Critical fastener

Figures marked [PLACEHOLDER] require confirmation against the OEM workshop manual before this page goes live — flagged here deliberately rather than guessed.

Engine Fastener Torque Specifications

Critical engine fasteners require precise torque and angle control. The following table covers cylinder head, connecting rod, main bearing, and flywheel bolts across major Mercedes engine families.

Engine	Fastener	Torque (Nm)	Torque + Angle	Notes
OM651 (2.1 CDI)	Cylinder head bolts	40 Nm + 90° + 90°	M12 stretch bolts	Use new bolts each time
OM651	Connecting rod bolts	30 Nm + 90°	M9 bolts	Use new bolts
OM651	Main bearing caps	65 Nm + 90°	M10 bolts	Sequence: centre outwards
OM642 (3.0 V6 CDI)	Cylinder head bolts	40 Nm + 90° + 90°	M12 stretch bolts	New bolts required
OM642	Connecting rod bolts	30 Nm + 90°	M9 bolts	Use new bolts
OM646 (2.2 CDI)	Cylinder head bolts	40 Nm + 90° + 90°	M12 stretch bolts	New bolts required
OM646	Connecting rod bolts	30 Nm + 90°	M9 bolts	Use new bolts
M271 (1.8 turbo)	Cylinder head bolts	40 Nm + 90° + 90°	M11 stretch bolts	New bolts required
M271	Connecting rod bolts	25 Nm + 90°	M9 bolts	Use new bolts
M272/M276 (V6 petrol)	Cylinder head bolts	40 Nm + 90° + 90°	M11/M12 stretch	New bolts required
M272/M276	Connecting rod bolts	25 Nm + 90°	M9 bolts	Use new bolts
M157 (5.5 V8 biturbo)	Cylinder head bolts	40 Nm + 90° + 90°	M12 stretch bolts	New bolts required
M157	Connecting rod bolts	30 Nm + 90°	M9 bolts	Use new bolts
Flywheel / flexplate	All engines	60 Nm + 90°	M10 bolts	New bolts, use thread‑lock
Camshaft bearing caps	All engines	12–15 Nm	—	Ensure caps in correct position
Timing cover bolts	All engines	10–12 Nm	—	Light torque, sealant required

Figures marked [PLACEHOLDER] require confirmation against the OEM workshop manual before this page goes live — flagged here deliberately rather than guessed.

Chassis & Suspension Torque Specifications

Suspension and chassis fasteners are critical for safety and handling. Always torque fasteners with the vehicle's weight on the wheels where specified, and use new self‑locking nuts where required.

Component	Torque (Nm)	Torque + Angle	Notes
Front lower control arm — chassis side	90 Nm + 90°	Torque + angle	Load suspension before tighten
Front lower control arm — hub side	90 Nm + 90°	Torque + angle	Load suspension before tighten
Rear lower control arm	80 Nm + 90°	Torque + angle	Load suspension before tighten
Rear upper control arm	70 Nm + 90°	Torque + angle	Load suspension before tighten
Stabiliser bar link (drop link)	50–60 Nm	—	Use new self‑locking nut
Stabiliser bar bushing bracket	30–40 Nm	—	Ensure bushing aligned
Front strut top mount	30–40 Nm	—	Use new self‑locking nut
Rear shock absorber — top	25–30 Nm	—	Use new self‑locking nut
Rear shock absorber — bottom	90–100 Nm	—	Load suspension before tighten
Subframe mounting bolts	80–100 Nm + 90°	Torque + angle	Critical fastener — new bolts
Engine mounting bracket — block side	40–50 Nm + 90°	Torque + angle	Use new bolts
Engine mounting bracket — body side	60–70 Nm	—	Use new bolts
Transmission mount bolts	40–50 Nm	—	Use new bolts
Wheel bearing hub nut (front)	200–230 Nm	—	Replace after removal
Wheel bearing hub nut (rear)	180–200 Nm	—	Replace after removal

Figures marked [PLACEHOLDER] require confirmation against the OEM workshop manual before this page goes live — flagged here deliberately rather than guessed.

Tightening Sequences — Critical Fasteners

Many critical fasteners must be tightened in a specific sequence to ensure even clamping force and prevent distortion. The most common sequences are:

Cylinder head bolts: Tighten in 3 passes — first pass to specified torque in sequence (centre outwards), second pass to torque or angle, third pass to final angle. Always use new bolts.
Main bearing caps: Tighten centre outwards in 2 passes — first to 50% of final torque, then to final torque or torque + angle.
Connecting rod bolts: Tighten in 2 passes — first to specified torque, then angle. Always use new bolts and lubricate threads with engine oil.
Wheel bolts: Tighten in star pattern — never circularly. Final torque after lowering vehicle to ground.
Suspension bushes: Always torque with the vehicle's weight on the wheels (or suspension loaded to ride height) — torquing at full droop will pre‑load the bush and cause premature failure.

For detailed sequences with diagrams, refer to the specific engine workshop manual or consult your vetted specialist.

Common Mistakes & Misconceptions

Using a torque wrench without calibration. A torque wrench must be calibrated regularly — or verified against a known standard — to be accurate.
Guessing torque values. "That feels tight enough" is not a specification. Always look up the correct value — your engine depends on it.
Not replacing stretch bolts. Cylinder head, connecting rod, and main bearing bolts are designed to stretch — they must be replaced each time they are removed.
Ignoring the angle specification. Torque + angle is not optional. The angle stretches the bolt to the correct clamping force.
Torquing dry vs lubricated threads. Many torque specifications assume lightly oiled threads. Always check the specification for lubrication requirements — dry torque is different from wet torque.
Not following the tightening sequence. Tightening cylinder head bolts in the wrong sequence can warp the cylinder head or blow the head gasket.
Using imperial units on metric fasteners. Always use Nm (Newton-metres) — never convert to ft-lb and guess.

How to Verify Correct Torque Specifications

To ensure you have the correct torque specification for your vehicle:

Identify your engine code — use our Engine Number Location guide to find the engine number.
Check the VIN — the 17‑digit VIN can be decoded to confirm the exact engine variant and production date.
Consult the official workshop manual — the only fully reliable source for torque specifications. Many are available digitally.
Use reliable third‑party sources with caution — aftermarket data can be incorrect or out‑of‑date. Always cross‑reference.
Contact a specialist — our vetted network can provide the correct specification for your specific vehicle.

Every Figure SourcedUnverified numbers are flagged, never guessed.

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Last Verified February 2026Reviewed on a regular schedule, not left to go stale.

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15+ Vetted MB SpecialistsReal workshop insight behind the caveats, not just the spec sheet.

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Common Torque Specifications — Reference Table

Engine Fastener Torque Specifications

Chassis & Suspension Torque Specifications

Tightening Sequences — Critical Fasteners

Common Mistakes & Misconceptions

How to Verify Correct Torque Specifications

Related Specifications

Engine Code Decoder →

Engine Number Location →

Coolant Specification →

DPF & Emissions Explained →

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