2003 BMW Z4 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


Auxiliary drive belt tensioner	30.24 lbf⋅ft30.24 lbf⋅ft41 N⋅m

expand_moreAlternator

expand_moreAll other modifications

expand_moreM8


First stage	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Use new screws.
Second stage	180°180°180°


Hydraulic lines at the servo-steering pump	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m
Replace sealing rings.

expand_moreCylinder head

expand_moreCamshaft bearing

expand_moreAll other modifications


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M7	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m
M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCylinder head screws

expand_moreAll other modifications

expand_moreM10

Figure 1. Cylinder head, Cylinder head screws, All other modifications, M10.


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace, wash and lubricate the screws. See figure 1.
Second stage	90°90°90°
Third stage	90°90°90°

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_moreConnecting rod bearing

expand_moreAll other modifications


First stage	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m
Clean and lubricate the screws.
Second stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Third stage	70°70°70°

expand_moreCrankshaft central screws


All other modifications	302.4 lbf⋅ft302.4 lbf⋅ft410 N⋅m
Replace bolt.

expand_moreCrankshaft pulley


M8 × 20 screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreDrive plate


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

expand_moreFlywheel


All other modifications	77.44 lbf⋅ft77.44 lbf⋅ft105 N⋅m
Replace screws.

expand_moreMain bearing

expand_moreBMW gasoline straight-6 2.2 L M54 B22 (226S1) 168 HP


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

expand_moreBMW gasoline straight-6 2.5 L M54 B25 (256S5) 189 HP

expand_moreM10


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

expand_moreAll other modifications

expand_moreM10 × 100 screws


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace screws.
Second stage	70°70°70°

expand_moreM10 × 27 screws


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

expand_moreM10 × 41 screws


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

expand_moreM8 × 37 screws


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace bolts.
Second stage	90°90°90°

expand_moreEngine control

expand_moreCamshaft timing chain guide rail

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_moreAt the cylinder head


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

expand_moreCamshaft timing chain tensioner

expand_moreN52 engine


Magnesium valve cover	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Replace sealing rings.
Plastic valve cover	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m
Replace sealing rings.

expand_moreCamshaft timing chain tensioning rail

expand_moreBearing screws


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreM22


Cap	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreCamshaft timing gear

expand_moreM7


First stage	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m
Second stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreChain tensioner

expand_moreAll other modifications


M26 × 1,5 screws	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m

expand_moreInlet camshaft wheel

expand_moreAll other modifications

expand_moreM10


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use new screw.
Second stage	180°180°180°

expand_moreOutlet camshaft wheel

expand_moreAll other modifications

expand_moreM10


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use new screw.
Second stage	180°180°180°

expand_moreEngine lubrication

expand_moreOil drain plug


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

expand_moreOil filter housing


Oil filter cover	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreOil pump

expand_moreAll other modifications


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreOil pump chain wheel

expand_moreBMW gasoline straight-6 2.2 L M54 B22 (226S1) 168 HP


M10	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreBMW gasoline straight-6 2.5 L M54 B25 (256S5) 189 HP


M10	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Left-hand thread

expand_moreAll other modifications

expand_moreM8


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Second stage	45°45°45°

expand_moreOil sump

expand_moreAll other modifications

expand_moreClass 10.9


M6	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m

expand_moreClass 8.8 screws


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreEngine management

expand_moreCrankshaft sensor


M6	6.64 lbf⋅ft6.64 lbf⋅ft9 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


Engine mounting	30.98 lbf⋅ft30.98 lbf⋅ft42 N⋅m

expand_moreExhaust system

expand_moreExhaust manifold

expand_moreAll other modifications


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Replace nuts.
M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Replace nuts.
M8	16.96 lbf⋅ft16.96 lbf⋅ft23 N⋅m
Replace nuts.

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	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2003 BMW Z4 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 Z4 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 2003 BMW Z4 you're not only saving money, but also also improving your technical skills and learning something new.

2003 BMW Z4 First generation Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

BMW Z4 First generation model years

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