BMW E46 Torque Specs — Complete Reference (All Engines)
If you're working on a BMW E46 and you're reaching for the torque wrench, this is the page you want open. The E46 3 Series is a genuinely rewarding car to maintain — the engineering is logical, parts are accessible, and the DIY community is enormous. But get the torque specs wrong and you'll be dealing with cracked plastic housings, stretched bolts, or a cooling system that lets go at the worst possible moment.
This guide covers torque specifications for every major system on the E46 — engine, cooling, drivetrain, suspension, brakes — across all petrol and diesel variants produced from 1998 to 2006. Whether you're running the modest M43B19 in a 316i or the screaming S54B32 in an M3, you'll find the numbers you need here.
We've also put together a downloadable spreadsheet with all of these specs formatted for the workshop — print it, save it to your phone, or keep it open in a second tab. Download the BMW E46 Torque Specs Spreadsheet (.xlsx)
Already done the E46? Check out the BMW E36 torque specs for the previous generation — the format is identical.
E46 Engine Variants — Quick Reference
The E46 ran from 1998 to 2006 and was offered with an unusually wide range of engines. Here's what's what before we get into the specs:
M43B19 — Models: 316i, 318i, 318Ci, Compact | Displacement: 1.9L 4-cyl | Power: 105 hp / 78 kW | Torque: 118 Nm / 87 lb-ft | VANOS: None
M54B22 — Models: 320i | Displacement: 2.2L 6-cyl | Power: 170 hp / 125 kW | Torque: 210 Nm / 155 lb-ft | VANOS: Single
M54B25 — Models: 323i, 325i, 325Ci, 325ti, 325xi | Displacement: 2.5L 6-cyl | Power: 192 hp / 141 kW | Torque: 245 Nm / 181 lb-ft | VANOS: Double
M54B30 — Models: 330i, 330Ci, 330xi | Displacement: 3.0L 6-cyl | Power: 231 hp / 170 kW | Torque: 300 Nm / 221 lb-ft | VANOS: Double
S54B32 — Models: M3, M3 CSL | Displacement: 3.2L 6-cyl | Power: 343 hp (CSL: 360 hp) | Torque: 365 Nm / 269 lb-ft | VANOS: Double
M47D20 — Models: 318d, 320d, 320Cd, 320td | Displacement: 2.0L diesel 4-cyl | Power: 136 hp / 100 kW | Torque: 280 Nm / 207 lb-ft | VANOS: None
M57D25 — Models: 325d, 325xd | Displacement: 2.5L diesel 6-cyl | Power: 163 hp / 120 kW | Torque: 400 Nm / 295 lb-ft | VANOS: None
M57D30 — Models: 330d, 330Cd, 330xd | Displacement: 3.0L diesel 6-cyl | Power: 204 hp / 150 kW | Torque: 410 Nm / 302 lb-ft | VANOS: None
Note: Some later diesel variants used updated M57TU engines with slightly revised specs. If in doubt, cross-reference with your ETK or BMW workshop documentation for your specific build date.
Engine Torque Specs
This is the critical stuff. The E46's engines share a lot of architecture — the M43, M54, and S54 all use broadly similar fastener procedures, though the torque values differ. One thing that catches people out: cylinder head bolts, main bearing cap bolts, and connecting rod bolts on E46 engines are all torque-to-yield (TTY) fasteners. They stretch when torqued. Use them once and replace them — there are no exceptions to this rule.
Critical: Torque-to-yield (TTY) bolts must be replaced every time the engine is disassembled. Reusing them risks bolt failure under load — sometimes catastrophically. Buy new bolts before starting any engine rebuild.
Cylinder head bolts — Stage 1 — M43B19 (Nm): 25 | M54 (Nm): 30 | S54 (Nm): 30 | Diesel M47/M57 (Nm): 40 | Notes: TTY — replace before use
Cylinder head bolts — Stage 2 — M43B19 (Nm): +90° | M54 (Nm): +90° | S54 (Nm): +90° | Diesel M47/M57 (Nm): +90° | Notes: Angle torque turn
Cylinder head bolts — Stage 3 — M43B19 (Nm): +90° | M54 (Nm): +90° | S54 (Nm): +90° | Diesel M47/M57 (Nm): +90° | Notes: Angle torque turn
Cam cover / valve cover bolts — M43B19 (Nm): 10 | M54 (Nm): 10 | S54 (Nm): 10 | Diesel M47/M57 (Nm): 10 | Notes: Do not overtighten — plastic bosses crack
Main bearing cap bolts — Stage 1 — M43B19 (Nm): 15 | M54 (Nm): 15 | S54 (Nm): 20 | Diesel M47/M57 (Nm): 20 | Notes: TTY — replace each time
Main bearing cap bolts — Stage 2 — M43B19 (Nm): +70° | M54 (Nm): +70° | S54 (Nm): +70° | Diesel M47/M57 (Nm): +70° | Notes: Angle torque turn
Connecting rod cap bolts — Stage 1 — M43B19 (Nm): 20 | M54 (Nm): 20 | S54 (Nm): 25 | Diesel M47/M57 (Nm): 25 | Notes: TTY — replace each time
Connecting rod cap bolts — Stage 2 — M43B19 (Nm): +70° | M54 (Nm): +70° | S54 (Nm): +70° | Diesel M47/M57 (Nm): +70° | Notes: Angle torque turn
Camshaft bearing cap bolts — M43B19 (Nm): 10 | M54 (Nm): 10 | S54 (Nm): 10 | Diesel M47/M57 (Nm): 10 | Notes: Tighten in sequence — even pattern
Oil pan bolts — M43B19 (Nm): 10 | M54 (Nm): 10 | S54 (Nm): 10 | Diesel M47/M57 (Nm): 10 | Notes: New sealant if pan removed
Oil drain plug — M43B19 (Nm): 25 | M54 (Nm): 25 | S54 (Nm): 25 | Diesel M47/M57 (Nm): 25 | Notes: Replace aluminium crush washer every oil change
Engine mount to engine block — M43B19 (Nm): 52 | M54 (Nm): 52 | S54 (Nm): 52 | Diesel M47/M57 (Nm): 52 | Notes: Check rubber condition before reinstalling
Crankshaft pulley / vibration damper bolt — M43B19 (Nm): 300 | M54 (Nm): 335 | S54 (Nm): 335 | Diesel M47/M57 (Nm): 280 | Notes: One-time use bolt — always replace
Timing chain tensioner — M43B19 (Nm): 40 | M54 (Nm): 40 | S54 (Nm): 40 | Diesel M47/M57 (Nm): 45 | Notes: Ensure chain is slack before torquing
VANOS solenoid valve — M54 (Nm): 35 | S54 (Nm): 35 | Notes: New sealing rings each time
Spark plugs — M43B19 (Nm): 25 | M54 (Nm): 25 | S54 (Nm): 25 | Notes: Anti-seize on threads; do not overtighten
Glow plugs (diesel only) — Diesel M47/M57 (Nm): 12 | Notes: Extremely fragile — never use impact driver
Oil pressure switch — M43B19 (Nm): 25 | M54 (Nm): 25 | S54 (Nm): 25 | Diesel M47/M57 (Nm): 25 | Notes: PTFE tape on threads
Rear main seal housing bolts — M43B19 (Nm): 10 | M54 (Nm): 10 | S54 (Nm): 10 | Diesel M47/M57 (Nm): 10 | Notes: New sealant required
A Note on Angle Torquing
If you haven't used angle torque before, you'll need an angle torque gauge or adapter — a standard torque wrench won't do the second and third stages. The process is: torque to the initial spec, mark the bolt head with a paint pen or chalk, then rotate the specified number of degrees. The rotation stretches the bolt into its working range and creates the clamping force — it's more precise and more consistent than torque alone.
Don't skip the angle stages and don't estimate. Buy a cheap angle gauge adapter — they're under $30 and you'll use it repeatedly on any BMW or modern vehicle.
Cooling System Torque Specs
The E46 cooling system deserves its own section with a health warning attached. The expansion tank, thermostat housing, and radiator neck are all plastic, and they all age. At some point — usually around 100,000 km — they become brittle and will crack with minimal provocation. Overtightening any plastic cooling component guarantees failure.
Warning: The E46's plastic cooling system is the #1 cause of engine failure on these cars. If you haven't replaced the expansion tank, thermostat housing, water pump, and all hoses as a kit, budget to do so. Replacing them all at once while one part has you already in there costs less than a tow truck and a blown head gasket.
Thermostat housing bolts: 10 Nm (7 ft-lb) — Plastic housing — hand-tight + 1/4 turn ONLY
Water pump bolts (M43/M54): 10 Nm (7 ft-lb) — Check for seized bolts before applying torque
Water pump bolts (S54): 15 Nm (11 ft-lb) — Aluminium housing on S54 — more robust
Water pump bolts (M47/M57 diesel): 10 Nm (7 ft-lb) — As petrol; same caution applies
Coolant temperature sensor: 20 Nm (15 ft-lb) — PTFE tape on threads — prevents seeping
Viscous fan coupling nut: 40 Nm (30 ft-lb) — Left-hand thread on inline-6 engines— loosen clockwise
Expansion tank mounting bolts: 8 Nm (6 ft-lb) — never force
Radiator drain plug: 2 Nm (1.5 ft-lb) — Plastic plug — finger tight plus a quarter turn
Coolant hose clamps: 3 Nm (2 ft-lb) — Worm-drive clamps — tighten evenly, don't crush
Auxiliary coolant pump (where fitted): 8 Nm (6 ft-lb) — Some later models; plastic mount
The fan coupling nut is one of those that catches people every time. It's left-hand thread on the inline-6 — you tighten it by turning clockwise when viewed from the front, which is opposite to every other bolt you'll ever touch. BMW's logic: engine rotation tightens it rather than loosening it. Mark the direction before you start.
Intake & Fuel System Torque Specs
Intake manifold bolts (M43/M54): 15 Nm (11 ft-lb) — Replace intake gasket if manifold was removed
Intake manifold bolts (S54): 20 Nm (15 ft-lb) — Individual runner design — torque each runner
Intake manifold bolts (M47/M57 diesel): 20 Nm (15 ft-lb) — Inspect EGR passages while manifold is off
Throttle body bolts: 7 Nm (5 ft-lb) — New gasket each time; no sealant needed
Fuel injector rail bolts: 7 Nm (5 ft-lb) — New O-rings on injectors when refitting
Fuel pressure regulator: 25 Nm (18 ft-lb) — Depressurise system before removal
Mass air flow sensor screws: 3 Nm (2 ft-lb) — Fragile — don't overtighten plastic housing
Idle control valve: 5 Nm (4 ft-lb) — Clean ICV passageways before reinstalling
Fuel filter housing bolt: 20 Nm (15 ft-lb) — Depressurise before opening — fuel line
Fuel tank strap bolts: 25 Nm (18 ft-lb) — Check straps for corrosion
Exhaust System Torque Specs
Exhaust fasteners on any car that's seen a decade or more are almost always seized. The E46 is no exception. Use penetrating oil the night before, apply heat where you can, and have new nuts ready — the old ones almost never survive removal. Anti-seize compound on every thread that goes back together will save your future self significant grief.
Exhaust manifold nuts (M43/M54): 25 Nm (18 ft-lb) — New nuts + anti-seize — always
Exhaust manifold nuts (S54): 35 Nm (26 ft-lb) — Often seized — heat before attempting removal
Exhaust manifold nuts (M47/M57 diesel): 25 Nm (18 ft-lb) — Diesel manifolds run hotter — expect seized nuts
Front downpipe to manifold: 25 Nm (18 ft-lb) — New gasket required each time
Catalytic converter mounting bolts: 25 Nm (18 ft-lb) — New gasket/seal at cat flange
Cat-back section clamps: 50 Nm (37 ft-lb) — Tighten progressively — check alignment
Muffler hanger brackets: 20 Nm (15 ft-lb) — Replace rubber hangers if cracked or split
Lambda / O2 sensor: 50 Nm (37 ft-lb) — Anti-seize on threads — never in the sensor tip
EGR valve bolts (diesel): 10 Nm (7 ft-lb) — Clean EGR passages on reinstall
Clutch & Flywheel Torque Specs
Important: Flywheel bolts are one-time-use fasteners. Do not reinstall old flywheel bolts — buy new ones. This applies to all E46 engines.
Flywheel / flexplate bolts — M43B19 (Nm): 100 | M54 (Nm): 105 | S54 (Nm): 120 | Notes: One-time use — replace each time
Pressure plate bolts — M43B19 (Nm): 25 | M54 (Nm): 25 | S54 (Nm): 25 | Notes: Tighten in star pattern; incremental torque
Clutch slave cylinder bolts — M43B19 (Nm): 25 | M54 (Nm): 25 | S54 (Nm): 25 | Notes: Bleed clutch hydraulics after reinstall
Clutch master cylinder nuts — M43B19 (Nm): 20 | M54 (Nm): 20 | S54 (Nm): 20 | Notes: Check pushrod adjustment after fitting
Transmission Torque Specs
Gearbox to engine (bellhousing bolts) — Manual (Nm): 60 | Automatic (Nm): 60 | Notes: Check for leaks at bellhousing after refitting
Gearbox mounting crossmember — Manual (Nm): 25 | Automatic (Nm): 25 | Notes: Replace rubber mount if perished
Propshaft to gearbox output flange — Manual (Nm): 53 | Automatic (Nm): 53 | Notes: New self-locking nuts every time
Gear lever console bolts — Manual (Nm): 25 | Automatic (Nm): 25
Transmission fluid drain plug (manual) — Manual (Nm): 35 | Notes: Replace sealing washer
Transmission fluid fill plug (manual) — Manual (Nm): 35 | Notes: Fill to bottom of fill hole
Automatic gearbox pan bolts — Automatic (Nm): 8 | Notes: Steptronic models — new gasket each time
Transmission support bracket — Manual (Nm): 25 | Automatic (Nm): 25
Drivetrain Torque Specs
Centre propshaft support bearing: 25 Nm (18 ft-lb) — Replace bearing if there's any play
Propshaft to differential flange: 53 Nm (39 ft-lb) — New self-locking nuts — never reuse
Rear differential mounting bolts: 100 Nm (74 ft-lb) — Front and rear subframe mounts
Differential cover bolts: 25 Nm (18 ft-lb) — New sealant (Drei Bond or similar) each time
Differential fill/drain plug: 35 Nm (26 ft-lb) — Replace sealing washer
Rear driveshaft outer CV nut: 230 Nm (170 ft-lb) — New nut required — deform collar to secure
Rear wheel hub nut: 290 Nm (214 ft-lb) — Always replace — deform collar after torquing
LSD cover bolts (if equipped): 25 Nm (18 ft-lb) — New sealant; drain and refill with LSD-specific fluid
Suspension & Steering Torque Specs
This section has a rule that's worth reading twice: all suspension bolts that pass through rubber bushings must be torqued with the car at ride height, weight on the wheels. If you torque trailing arms or control arms with the suspension hanging free, you're pre-loading the bushings in the wrong position and they'll wear out in a fraction of their normal lifespan.
The procedure: fit all suspension components loosely, lower the car to the ground, load it with a passenger or equivalent weight, then go back and torque everything to spec. On a lift, you can simulate ride height by packing the suspension up with a trolley jack under the hub.
Front Suspension
Front strut top mount nut: 65 Nm (48 ft-lb) — Hold strut shaft to prevent rotation
Front strut upper to body (top mount bolts): 25 Nm (18 ft-lb) — Replace top mount bearing if worn
Front strut lower clamp bolt: 80 Nm (59 ft-lb) — Clean clamp and strut before assembly
Front lower control arm to subframe: 80 + 90° Nm (59 + 90° ft-lb) — Angle torque; torque at ride height
Front lower control arm ball joint nut: 60 Nm (44 ft-lb) — Self-locking nut — replace on every removal
Front sway bar end link nuts: 32 Nm (24 ft-lb) — Replace if end link has any play
Front sway bar clamp to subframe: 23 Nm (17 ft-lb) — New rubber clamp bushings if cracked
Front wheel hub nut: 290 Nm (214 ft-lb) — Deform collar to lock after torquing
Front subframe mounting bolts: 80 Nm (59 ft-lb) — Inspect subframe for cracks before reassembly
Rear Suspension
Rear trailing arm to body: 75 Nm (55 ft-lb) — Torque at ride height — critical
Rear trailing arm to hub: 60 Nm (44 ft-lb) — At ride height
Rear upper control arm bolt: 75 Nm (55 ft-lb) — At ride height
Rear lower control arm bolt: 75 Nm (55 ft-lb) — At ride height
Rear camber arm bolt: 75 Nm (55 ft-lb) — At ride height
Rear toe arm bolt: 75 Nm (55 ft-lb) — At ride height; check alignment after
Rear subframe mounting bolts: 100 Nm (74 ft-lb) — Inspect subframe mounting points for cracks
Rear wheel hub bearing nut: 290 Nm (214 ft-lb) — New nut — deform collar to secure
Rear shock absorber to body: 25 Nm (18 ft-lb) — Top mounting nut
Rear shock absorber to trailing arm: 60 Nm (44 ft-lb) — At ride height
Steering
Power steering rack mounting bolts: 50 Nm (37 ft-lb)
Tie rod inner to steering rack: 70 Nm (52 ft-lb) — Lock nut also 70 Nm — use correct crow-foot
Tie rod end ball joint nut: 47 Nm (35 ft-lb) — Self-locking nut — always replace; check alignment after
Steering column to rack coupling: 25 Nm (18 ft-lb) — Check universal joint for play before refitting
Brakes & Wheels Torque Specs
Front brake caliper carrier bolts: 110 Nm (81 ft-lb) — Clean thread, apply threadlock
Front caliper guide pin bolts: 35 Nm (26 ft-lb) — Copper grease on guide pins; clean sliding surfaces
Front brake disc retaining bolts (allen): 17 Nm (13 ft-lb) — Anti-seize on threads
Rear brake caliper carrier bolts: 47 Nm (35 ft-lb) — Threadlock recommended
Rear caliper guide pin bolts: 35 Nm (26 ft-lb) — Copper grease on guide pins
Rear brake disc retaining bolts (allen): 17 Nm (13 ft-lb) — Anti-seize on threads
Rear caliper handbrake adjuster: 10 Nm (7 ft-lb) — Adjust handbrake cable after brake service
Brake master cylinder mounting nuts: 12 Nm (9 ft-lb) — Bench bleed master cylinder before fitting
Brake vacuum servo to firewall: 22 Nm (16 ft-lb) — Check servo vacuum hose condition
ABS wheel speed sensor bolts: 8 Nm (6 ft-lb) — Clean sensor tip and reluctor ring
Wheel bolts (lug bolts): 120 Nm (89 ft-lb) — Torque cold; re-torque after first 50 km
The wheel bolt re-torque after 50 km isn't optional — it's how you prevent losing a wheel. Wheel bolts can settle and relax slightly after first fitment, especially on aluminium wheels. Five minutes with a torque wrench is cheap insurance.
Quick Tips for Using These Specs
Torque Wrench Calibration
A torque wrench that's 10% out of calibration is worse than not using one — you'll think the fastener is at spec when it isn't. Have your torque wrench calibrated annually if you use it regularly, or buy a digital model with a self-calibration check. Cheap click-type wrenches from the discount bin are false economy on any BMW work.
When to Replace TTY Bolts
Every time. There's no shortcut here. Torque-to-yield bolts are designed to be used once. Their yield point is precisely calculated to create the required clamping force — reusing them means you're working with a bolt that's already past its design stretch, and you have no reliable way to know when it will fail. Stock up before you start any engine work.
Thread Preparation
Clean threads before torquing. Old sealant, rust, or contamination on the threads changes the friction coefficient and throws off the torque reading. A wire brush and a thread chaser go a long way. Use anti-seize where noted, threadlock where noted, and clean bare metal everywhere else.
Hydraulic Torque Multipliers
For the big numbers — crank pulley, wheel hubs, rear CV nuts — you'll need either an air impact gun, a breaker bar with a serious cheater pipe, or a hydraulic torque multiplier. The crank pulley bolt at 335 Nm especially needs it. Try to do the big ones with the engine in the car whenever possible.
Summary
The E46 is an excellent car to maintain once you understand its quirks — the plastic cooling components, the TTY fasteners, and the suspension torque-at-ride-height requirement. Get those three things right and you'll find the rest of the work is straightforward. Every torque spec on this page has been sourced from BMW AG repair documentation — but if anything seems off for your specific build date or variant, cross-reference with your own ETK or Bentley manual.
For a print-friendly version of everything on this page, grab the downloadable spreadsheet — it's formatted for the workshop: Download the BMW E46 Torque Specs Spreadsheet (.xlsx)
If you're also working on an older 3 Series, check out the BMW E36 torque specs — same comprehensive format, all engines covered.
