2006 BMW Z4 engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


M7	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m

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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP

expand_moreOnto crankcase


M8	14.01 lbf⋅ft14.01 lbf⋅ft19 N⋅m

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_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


Inlet camshaft	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m
Replace aluminum screws.

expand_moreOutlet camshaft


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace aluminum screws.
Second stage	60°60°60°
Install bearing using special tool.

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


Inlet camshaft	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m
Replace aluminum screws.

expand_moreOutlet camshaft


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace aluminum screws.
Second stage	60°60°60°
Install bearing using special tool.

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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP

Figure 1. Cylinder head, Cylinder head screws, BMW gasoline straight-4 2.0 L N46 B20 A 148 HP.


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace, wash and lubricate the screws. See figure 1.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreMagnesium valve cover

expand_moreScrews 1 – 14

Figure 2. Cylinder head, Cylinder head screws, BMW gasoline straight-6 2.5 L N52 B25 A 174 HP, Magnesium valve cover, Screws 1 – 14.


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws. See figure 2.
Second stage	90°90°90°
Fourth stage	45°45°45°

expand_moreScrews 1 – 10


Third stage	90°90°90°

expand_moreScrews 15 – 18


Fifth stage	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Replace screws.
Sixth stage	90°90°90°

expand_morePlastic valve cover

expand_moreScrews 1 – 14


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws. See figure 2.
Second stage	90°90°90°
Fourth stage	45°45°45°

expand_moreScrews 1 – 10


Third stage	90°90°90°

expand_moreScrews 15 – 18


Fifth stage	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Replace screws.

expand_moreScrews 15 – 17


Sixth stage	90°90°90°

expand_moreScrew 18


Seventh stage	135°135°135°

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreMagnesium valve cover

expand_moreScrews 1 – 14


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws. See figure 2.
Second stage	90°90°90°
Fourth stage	45°45°45°

expand_moreScrews 1 – 10


Third stage	90°90°90°

expand_moreScrews 15 – 18


Fifth stage	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
Replace screws.
Sixth stage	90°90°90°

expand_morePlastic valve cover

expand_moreScrews 1 – 14


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws. See figure 2.
Second stage	90°90°90°
Fourth stage	45°45°45°

expand_moreScrews 1 – 10


Third stage	90°90°90°

expand_moreScrews 15 – 18


Fifth stage	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Replace screws.

expand_moreScrews 15 – 17


Sixth stage	90°90°90°

expand_moreScrew 18


Seventh stage	135°135°135°

expand_moreAll other modifications

expand_moreM10

Figure 3. 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 3.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreValve cover

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreMagnesium valve cover


First stage	5.16 lbf⋅ft5.16 lbf⋅ft7 N⋅m
Replace screws.
Second stage	90°90°90°


Plastic valve cover	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreMagnesium valve cover


First stage	5.16 lbf⋅ft5.16 lbf⋅ft7 N⋅m
Replace screws.
Second stage	90°90°90°


Plastic valve cover	6.64 lbf⋅ft6.64 lbf⋅ft9 N⋅m

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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


First stage	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m
Replace screw, wash and slightly oil.
Second stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Third stage	70°70°70°

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace screw, wash and slightly oil.
Second stage	120°120°120°

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace screw, wash and slightly oil.
Second stage	120°120°120°

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

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


M16	221.27 lbf⋅ft221.27 lbf⋅ft300 N⋅m
Replace bolt.

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreM16


First stage	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Replace and lightly oil the screw.
Second stage	360°360°360°

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreM16


First stage	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Replace and lightly oil the screw.
Second stage	360°360°360°


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

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreN52 engine


Magnesium valve cover	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.

expand_morePlastic valve cover


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws.
Second stage	92.2 lbf⋅ft92.2 lbf⋅ft125 N⋅m

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreN52 engine


Magnesium valve cover	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.

expand_morePlastic valve cover


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws.
Second stage	92.2 lbf⋅ft92.2 lbf⋅ft125 N⋅m


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

expand_moreFlywheel

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


M12	95.88 lbf⋅ft95.88 lbf⋅ft130 N⋅m
Replace screws.

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


N52 engine	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


N52 engine	88.51 lbf⋅ft88.51 lbf⋅ft120 N⋅m
Replace screws.


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

expand_moreMain bearing

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace 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_moreVibration damper

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP

expand_moreClass 10.9


M8	25.08 lbf⋅ft25.08 lbf⋅ft34 N⋅m

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


M8 × 16 screws (class 10.9)	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m
M8 × 20 screws (class 8.8)	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


M12	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


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

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


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

expand_moreAll other modifications


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

expand_moreInlet camshaft wheel

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


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_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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


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_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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP

expand_moreOnto crankcase


M8 × 100 screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAll other modifications


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreOil pump chain wheel

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


M10	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP

expand_moreClass 8.8 screws


M8	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws.

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreAluminium sump M8 × 112 screws


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreSheet-steel sump M8 × 24 screws


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

expand_moreAluminium sump M8 × 26 screws


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

expand_moreAluminium sump M8 × 92 screws


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreAluminium sump M8 × 112 screws


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreSheet-steel sump M8 × 24 screws


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

expand_moreAluminium sump M8 × 26 screws


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

expand_moreAluminium sump M8 × 92 screws


First stage	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
Replace screws.
Second stage	180°180°180°

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

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreM8


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

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreM8


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


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_moreBMW gasoline straight-4 2.0 L N46 B20 A 148 HP


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

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use assembly paste

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use assembly paste

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

expand_moreBMW gasoline straight-6 2.5 L N52 B25 A 174 HP

expand_moreM10 × 30 screws


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

expand_moreM10 × 85 screws


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

expand_moreBMW gasoline straight-6 3.0 L N52 B30 A 261 HP

expand_moreM10 × 30 screws


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

expand_moreM10 × 85 screws


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


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 2006 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 2006 BMW Z4 you're not only saving money, but also also improving your technical skills and learning something new.

2006 BMW Z4 generations

In 2006 BMW offered 2 generations of the Z4. Engine fastener tightening specifications may vary in different generations. Be sure that you are looking at the rigt modification.

First generation

E85

2006 BMW Z4 First generation LCI Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

2006 BMW Z4 generations

First generation

BMW Z4 First generation LCI model years

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