2012 BMW 3 Series Sedan engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold

expand_moreAll other modifications


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreAuxiliary assemblies

expand_moreAuxiliary drive belt deflection pulley

expand_moreAll other modifications


M10	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m
M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreAuxiliary drive belt tensioner

expand_moreAll other modifications


M10	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m

expand_moreAir-conditioning compressor

expand_moreAll other modifications


M10	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m
M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreAir-conditioning compressor pressure line


All other modifications	13.28 lbf⋅ft13.28 lbf⋅ft18 N⋅m

expand_moreAlternator

expand_moreAll other modifications


M10	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m


Alternator pulley	59 lbf⋅ft59 lbf⋅ft80 N⋅m

expand_morePower steering pump bracket

expand_moreM10


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Second stage	90°90°90°

expand_moreCarburetion

expand_moreFuel-distributing pipe


All other modifications	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreHigh-pressure line

expand_moreAll other modifications


Union nuts	17.7 lbf⋅ft17.7 lbf⋅ft24 N⋅m

expand_moreHigh-pressure pump

expand_moreAll other modifications


M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreHigh-pressure pump pulley


Cap	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace the cover plate.

expand_moreM12


Central screws	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m

expand_moreInjection hoses

expand_moreAll other modifications


Union nuts	17.7 lbf⋅ft17.7 lbf⋅ft24 N⋅m

expand_moreInjection nozzle (injector)

expand_moreAll other modifications


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Second stage	19.18 lbf⋅ft19.18 lbf⋅ft26 N⋅m

expand_moreCharging

expand_moreTurbo charger

expand_moreAll other modifications


M8	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m


Turbocharger oil feed line	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
Replace sealing rings.
Turbocharger oil return line	2.21 lbf⋅ft2.21 lbf⋅ft3 N⋅m
Hose clamps.

expand_moreCooling system

expand_moreCoolant pump


All other modifications	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreCoolant thermostat housing


M6	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m


Fan wheel	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreCylinder head

expand_moreCamshaft bearing

expand_moreAll other modifications


Bearing cap	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Figure 1. Cylinder head, Camshaft bearing, All other modifications.
Bearing casing	9.59 lbf⋅ft9.59 lbf⋅ft13 N⋅m
See figure 1.

expand_moreCylinder head screws

expand_moreAll other modifications

expand_moreScrews 1 – 10

Figure 2. Cylinder head, Cylinder head screws, All other modifications, Screws 1 – 10.


First stage	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace screws. See figure 2.
Second stage	180° detach
loosen in reverse order to the illustration
Third stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Fourth stage	120°120°120°
Fifth stage	120°120°120°

expand_moreScrew 11


Sixth stage	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreValve cover

expand_moreAll other modifications


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m

expand_moreEngine block

expand_moreBalance shaft gear wheel


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Second stage	90°90°90°

expand_moreBalance shaft module

expand_moreM8 × 83 screws


First stage	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace, wash and lightly lubricate the screws.
Second stage	90°90°90°

expand_moreConnecting rod bearing

expand_moreAll other modifications


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace, wash and lubricate the screws.
Second stage	70°70°70°

expand_moreCrank case bottom half

expand_moreM10 × 27 screws


First stage	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Use new screws.
Second stage	90°90°90°

expand_moreM10 × 41 screws


First stage	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreM8 × 37 screws


First stage	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreCrankshaft central screws


All other modifications	221.27 lbf⋅ft221.27 lbf⋅ft300 N⋅m
Replace the screws and lubricate lightly

expand_moreCrankshaft pulley

expand_moreAll other modifications


M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
M8 screws (class 10.9)	25.08 lbf⋅ft25.08 lbf⋅ft34 N⋅m

expand_moreDrive plate


All other modifications	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.

expand_moreEngine block closure screws


All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreFlywheel


All other modifications	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.

expand_moreMain bearing

expand_moreAll other modifications

expand_moreM10 × 85 screws


First stage	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace screws.
Second stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Third stage	60°60°60°
Fourth stage	60°60°60°

expand_moreVibration damper

expand_moreAll other modifications


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace screws.
Second stage	120°120°120°

expand_moreEngine control

expand_moreCamshaft timing chain guide rail

expand_moreAll other modifications

expand_moreBearing screws


M7	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m

expand_moreM18


Cap	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreCamshaft timing chain slip rail

expand_moreAll other modifications

expand_moreAt the cylinder head


M6 × 35 screws	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreCamshaft timing chain tensioner


All other modifications	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace sealing rings.

expand_moreCamshaft timing chain tensioning rail


All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCamshaft timing gear


All other modifications	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m

expand_moreChain tensioner

expand_moreAll other modifications


M22 × 1,5 screws	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m


Control drive chain guide rail	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Control drive chain tensioner	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Control drive chain tensioning rail	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreInlet camshaft wheel

expand_moreAll other modifications


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use new screw.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreOil pump camshaft timing chain guide rail


M6	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreOil pump drive chain tensioner

expand_moreM16 × 1,5 screws


Cap	23.6 lbf⋅ft23.6 lbf⋅ft32 N⋅m
Replace sealing rings.


M6	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreOutlet camshaft wheel

expand_moreAll other modifications


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use new screw.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreTiming case cover

expand_moreAll other modifications


M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreEngine lubrication

expand_moreOil cooler


All other modifications	4.43 lbf⋅ft4.43 lbf⋅ft6 N⋅m

expand_moreOil drain plug


M12 × 1,5 screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace sealing rings.

expand_moreOil filter housing

expand_moreAll other modifications


Oil filter cover	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
On the engine block	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreOil pump

expand_moreAll other modifications


M8 × 30 screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreM8 × 45 screws


First stage	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreOil pump chain wheel

expand_moreAll other modifications


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

expand_moreAll other modifications


On the engine block	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreEngine management

expand_moreCamshaft sensor


All other modifications	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreCrankshaft sensor


All other modifications	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m

expand_moreGlow plugs


All other modifications	9.59 lbf⋅ft9.59 lbf⋅ft13 N⋅m

expand_moreKnock sensor


All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


Lambda sensor	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreEngine mounting

expand_moreEngine bracket


M10 screws (class 8.8)	28.03 lbf⋅ft28.03 lbf⋅ft38 N⋅m

expand_moreEngine mounting

expand_moreAll other modifications

expand_moreAt the crossmember


M10 screws (class 10.9)	41.3 lbf⋅ft41.3 lbf⋅ft56 N⋅m

expand_moreSubframe


M12	79.66 lbf⋅ft79.66 lbf⋅ft108 N⋅m

expand_moreSubframe diagonal strut

expand_moreM10


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

expand_moreSubframe stiffening plate

expand_moreAll other modifications

expand_moreM10


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

expand_moreExhaust system

expand_moreDiesel particulate filter

expand_moreAll other modifications

expand_moreScrews at the gearbox bracket


M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreM8 × 20 screws


Strut	15.49 lbf⋅ft15.49 lbf⋅ft21 N⋅m

expand_moreOn catalytic converter


Clamps	37.62 lbf⋅ft37.62 lbf⋅ft51 N⋅m

expand_moreOn primary catalytic converter


Clamps	37.62 lbf⋅ft37.62 lbf⋅ft51 N⋅m

expand_moreExhaust manifold


All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace nuts.

expand_moreExhaust pipe

expand_moreAll other modifications

expand_moreOn exhaust manifold


M10	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

expand_moreExhaust pipe bracket

expand_moreAll other modifications

expand_moreAt the gearbox


M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreParticle filter bracket

expand_moreScrews at the gearbox bracket


M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

expand_moreM8 × 20 screws


Strut	15.49 lbf⋅ft15.49 lbf⋅ft21 N⋅m

expand_morePrimary catalytic converter

expand_moreAt the turbocharger


Clamps	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use a new clamp

expand_moreOn diesel particulate filter


Clamps	37.62 lbf⋅ft37.62 lbf⋅ft51 N⋅m

expand_moreIgnition system

expand_moreSpark plugs


M12	14.75–19.18 lbf⋅ft14.75–19.18 lbf⋅ft20–26 N⋅m
M14	19.91–24.34 lbf⋅ft19.91–24.34 lbf⋅ft27–33 N⋅m

expand_moreStart system

expand_moreStarter


All other modifications	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2012 BMW 3 Series Sedan 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

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 3 Series Sedan 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 2012 BMW 3 Series Sedan you're not only saving money, but also also improving your technical skills and learning something new.

2012 BMW 3 Series Sedan generations

In 2012 BMW offered 2 generations of the 3 Series Sedan. Engine fastener tightening specifications may vary in different generations. Be sure that you are looking at the rigt modification.

Sixth generation

F30

2012 BMW 3 Series Sedan Fifth generation LCI Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

2012 BMW 3 Series Sedan generations

Sixth generation

BMW 3 Series Sedan Fifth generation LCI model years

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