2021 BMW 4 Series M4 Convertible engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system


Intake manifold	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m

expand_moreAuxiliary assemblies

expand_moreAuxiliary drive belt deflection pulley

expand_moreSupport on the engine block


With deflection pulley	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m


Otherwise	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m


Auxiliary drive belt tensioner	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m
Air-conditioning compressor	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m
Air-conditioning compressor bracket	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m
Alternator	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m
Vacuum pump	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m
Vacuum pump sprocket wheel	48.68 lbf⋅ft48.68 lbf⋅ft66 N⋅m
Clean and lubricate the screws.

expand_moreCarburetion


Fuel-distributing pipe	9.59 lbf⋅ft9.59 lbf⋅ft13 N⋅m
High-pressure line	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
High-pressure pump	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m
Injection nozzle (injector)	16.96 lbf⋅ft16.96 lbf⋅ft23 N⋅m

expand_moreCharging

expand_moreTurbo charger

expand_moreAt the cylinder head


First stage	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m
Replace nuts.
Third stage	13.28 lbf⋅ft13.28 lbf⋅ft18 N⋅m

expand_moreStud bolt at the cylinder head


Second stage	90°90°90°

expand_moreTurbocharger oil feed line


At the turbocharger	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
On the engine block	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreTurbocharger oil return line


At the turbocharger	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
On the engine block	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreCooling system


Coolant pump	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Coolant pump pulley	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreCylinder head

expand_moreCamshaft bearing


Inlet camshaft	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreOutlet camshaft


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Second stage	60°60°60°

expand_moreCylinder head screws


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace bolts.
Second stage	90°90°90°
Third stage	180°180°180°

expand_moreM9 × 30 screws


M9 × 70 screws	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m


Valve cover	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreEngine block

expand_moreConnecting rod bearing


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace, wash and lightly lubricate the screws.
Second stage	140°140°140°

expand_moreEngine block closure screws

expand_moreOn timing case cover


Bottom	19.91 lbf⋅ft19.91 lbf⋅ft27 N⋅m
Top	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreFlywheel


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Replace screws.
Second stage	45°45°45°

expand_moreMain bearing


First stage	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Replace screws, wash and slightly oil.
Second stage	270°270°270°


Vibration damper	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m

expand_moreEngine control

expand_moreChain tensioner


At the cylinder head	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m
Oil thread.

expand_moreControl drive chain guide rail


At the cylinder head	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m
On the engine block	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreControl drive chain tensioner


On the engine block	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m


Control unit for intake valve timing	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m
Eccentric shaft for intake valve timing	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreInlet camshaft wheel


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace bolts.
Second stage	180°180°180°

expand_moreOutlet camshaft wheel


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace bolts.
Second stage	180°180°180°

expand_moreEngine lubrication


Oil cooler	11.8 lbf⋅ft11.8 lbf⋅ft16 N⋅m

expand_moreOil drain plug

expand_moreMagnesium


Oil sump	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreOil filter


Oil filter cover	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Slightly oil sealing lips.

expand_moreOil filter housing


At the cylinder head	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreOil pressure sensor


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Second stage	16°16°16°


Oil pump	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreOil pump chain wheel


First stage	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m
Use new screw. (left-hand thread)
Second stage	90°90°90°

expand_moreOil sump


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreAluminium oil sump


Second stage	180°180°180°


At the gearbox	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreMagnesium oil sump


Second stage	60°60°60°

expand_moreEngine management


Camshaft sensor	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Charge air pressure sensor	2.95 lbf⋅ft2.95 lbf⋅ft4 N⋅m
Crankshaft sensor	3.39 lbf⋅ft3.39 lbf⋅ft4.6 N⋅m
Knock sensor	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
Lambda sensor	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreEngine mounting

expand_moreEngine bracket


On the engine block	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m

expand_moreEngine mounting


At the subframe	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m
On engine bracket	41.3 lbf⋅ft41.3 lbf⋅ft56 N⋅m

expand_moreEngine suspension

expand_moreOn the engine block


M10 screws (class 8.8)	48.68 lbf⋅ft48.68 lbf⋅ft66 N⋅m


Subframe	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m

expand_moreSubframe stiffening plate

expand_moreM10


First stage	41.3 lbf⋅ft41.3 lbf⋅ft56 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreExhaust system

expand_moreCatalytic converter

expand_moreAt the turbocharger


Clamps	9.59 lbf⋅ft9.59 lbf⋅ft13 N⋅m

expand_moreCatalytic converter bracket


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m


Exhaust manifold heat shields	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreExhaust pipe


On catalytic converter	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreExhaust pipe bracket


At the gearbox	20.65 lbf⋅ft20.65 lbf⋅ft28 N⋅m
On chassis	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreExhaust pipe rear


Clamps	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

expand_moreIgnition system

expand_moreSpark plugs


M12 × 1,25 screws	16.96 lbf⋅ft16.96 lbf⋅ft23 N⋅m
M14 × 1,25 screws	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

expand_moreStart system


Starter	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2021 BMW 4 Series M4 Convertible user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Before doing any DIY service please check your insurance policy and BMW warranty policy for your region. In some regions DIY service may invalidate your warranty.

Maintenance Items

Chassis and Body Fastener Tightening Specifications
Engine Fastener Tightening Specifications
Front Suspension Fastener Tightening Specifications
Rear Suspension Fastener Tightening Specifications
Transmission Fastener Tightening Specifications

Service Intervals

Conquer your fears and never give up!

DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow BMW 4 Series M4 Convertible service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.

Doing basic service for your 2021 BMW 4 Series M4 Convertible you're not only saving money, but also also improving your technical skills and learning something new.

2021 BMW 4 Series M4 Convertible First generation Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

BMW 4 Series M4 Convertible First generation model years

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