2003 BMW 3 Series Compact engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold


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_moreCharging

expand_moreTurbo charger


On exhaust manifold	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Use hot screw paste


Turbocharger oil feed line	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace sealing rings.

expand_moreCylinder head

expand_moreCamshaft bearing


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 diesel straight-4 2.0 L M47 D20 (204D4) 114 HP

Figure 1. Cylinder head, Cylinder head screws, BMW diesel straight-4 2.0 L M47 D20 (204D4) 114 HP.


First stage	59 lbf⋅ft59 lbf⋅ft80 N⋅m
Use new screws, and oil the screws. See figure 1.
Second stage	slacken
Third stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Fourth stage	90°90°90°
Fifth stage	90°90°90°

expand_moreBMW diesel straight-4 2.0 L M47 D20 (204D4) 148 HP


First stage	59 lbf⋅ft59 lbf⋅ft80 N⋅m
Use new screws, and oil the screws. See figure 1.
Second stage	slacken
Third stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Fourth stage	90°90°90°
Fifth stage	90°90°90°

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

Figure 2. Cylinder head, Cylinder head screws, BMW gasoline straight-6 2.5 L M54 B25 (256S5) 189 HP.


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Use new screws, and oil the screws. See figure 2.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreAll other modifications

Figure 3. Cylinder head, Cylinder head screws, All other modifications.


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
See figure 3.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreValve cover


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


First stage	3.69 lbf⋅ft3.69 lbf⋅ft5 N⋅m
Replace, wash and lightly 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 diesel straight-4 2.0 L M47 D20 (204D4) 114 HP


First stage	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Second stage	60°60°60°
Third stage	60°60°60°
Fourth stage	30°30°30°

expand_moreBMW gasoline straight-4 2.0 L N46 B20 A 141 HP


First stage	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Second stage	60°60°60°
Third stage	60°60°60°
Fourth stage	30°30°30°


BMW gasoline straight-6 2.5 L M54 B25 (256S5) 189 HP	302.4 lbf⋅ft302.4 lbf⋅ft410 N⋅m
Replace bolt.

expand_moreAll other modifications


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Replace bolts.
Second stage	221.27 lbf⋅ft221.27 lbf⋅ft300 N⋅m

expand_moreFlywheel


BMW diesel straight-4 2.0 L M47 D20 (204D4) 148 HP	77.44 lbf⋅ft77.44 lbf⋅ft105 N⋅m
Replace screws.
All other modifications	95.88 lbf⋅ft95.88 lbf⋅ft130 N⋅m
Replace screws.

expand_moreMain bearing

expand_moreAll BMW gasoline straight-6 2.5 L M54 B25 (256S5) engines


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


First stage	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
Clean and lubricate the screws.
Second stage	90°90°90°


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

expand_moreEngine control

expand_moreCamshaft timing chain guide rail


M6	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m
M7	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m
M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCamshaft timing chain slip rail


M16 × 1,5 screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCamshaft timing chain tensioner


M22 × 1,5 screws	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m
Replace sealing rings.

expand_moreCamshaft timing chain tensioning rail

expand_moreBMW diesel straight-4 2.0 L M47 D20 (204D4) 114 HP


M16 × 1,5 screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreBMW gasoline straight-4 1.6 L N45 B16 A 114 HP


Cap	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m
Replace sealing rings.

expand_moreBMW diesel straight-4 2.0 L M47 D20 (204D4) 148 HP


M16 × 1,5 screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCamshaft timing gear

expand_moreBMW diesel straight-4 2.0 L M47 D20 (204D4) 114 HP


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Second stage	50°50°50°

expand_moreBMW diesel straight-4 2.0 L M47 D20 (204D4) 148 HP


First stage	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Second stage	50°50°50°

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


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


All BMW gasoline straight-6 2.5 L M54 B25 (256S5) engines	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m

expand_moreAll other modifications


Cap	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Chain tensioner	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreInlet camshaft wheel

expand_moreBMW gasoline straight-4 1.6 L N45 B16 A 114 HP

expand_moreN45 B16 egnine


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_moreN45 B16 TU2 egnine


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

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_moreOutlet camshaft wheel

expand_moreBMW gasoline straight-4 1.6 L N45 B16 A 114 HP

expand_moreN45 B16 egnine


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_moreN45 B16 TU2 egnine


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

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


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

expand_moreEngine lubrication


Oil drain plug	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Oil filter housing	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreOil sump

expand_moreAll BMW gasoline straight-6 2.5 L M54 B25 (256S5) engines


M6 screws (class 10.9)	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m
M6 8.8	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreAll other modifications


M6 screws (class 10.9)	8.85 lbf⋅ft8.85 lbf⋅ft12 N⋅m
M6 8.8	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreEngine management


Glow plugs	13.28 lbf⋅ft13.28 lbf⋅ft18 N⋅m

expand_moreKnock sensor


325 ti with gasoline straight-6 2.5 L 189 HP engine (2001.6–2005.2)	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


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

expand_moreExhaust system

expand_moreExhaust manifold


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


All BMW gasoline straight-6 2.5 L M54 B25 (256S5) engines	16.96 lbf⋅ft16.96 lbf⋅ft23 N⋅m

expand_moreAll other modifications


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

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2003 BMW 3 Series Compact 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 Compact 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 3 Series Compact you're not only saving money, but also also improving your technical skills and learning something new.

2003 BMW 3 Series Compact Second generation Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

BMW 3 Series Compact Second generation model years

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