1991 Audi Coupe engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold


All Audi gasoline V6 2.8 L AAH engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-4 1.8 L DZ engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-5 2.0 L NM engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All other modifications	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAuxiliary assemblies


Auxiliary drive belt tensioner	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m
Auxiliary drive belt tensioner	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAlternator

expand_moreClamping screws


Tensioning screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreRetaining clamp


Screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreScrews


Bottom	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m

expand_moreServo steering pump


Tensioning screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreCylinder head

expand_moreCamshaft bearing


All Audi gasoline straight-4 2.0 L AAD engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-4 2.0 L ABK engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-4 1.8 L DZ engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


Valve cover	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreEngine block

expand_moreConnecting rod bearing


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Use new screws.
Second stage	90°90°90°

expand_moreCrankshaft central screws

expand_moreAudi gasoline straight-5 2.3 L NG 131 HP


Special tool 2079	258.15 lbf⋅ft258.15 lbf⋅ft350 N⋅m
Otherwise	331.9 lbf⋅ft331.9 lbf⋅ft450 N⋅m

expand_moreAudi gasoline straight-5 2.3 L NG 134 HP


Special tool 2079	258.15 lbf⋅ft258.15 lbf⋅ft350 N⋅m
Otherwise	331.9 lbf⋅ft331.9 lbf⋅ft450 N⋅m

expand_moreAudi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m


First stage	147.51 lbf⋅ft147.51 lbf⋅ft200 N⋅m
Use new screws.
Second stage	90°90°90°
Third stage	90°90°90°

expand_moreAll other modifications


First stage	66.38 lbf⋅ft66.38 lbf⋅ft90 N⋅m
Use new screws.
Second stage	90°90°90°

expand_moreCrankshaft pulley

expand_moreAll Audi gasoline straight-4 2.0 L AAD engines

expand_moreClass 10.9


M8	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m

expand_moreClass 8.8 screws


M8	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m


All Audi gasoline V6 2.8 L AAH engines	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreDrive plate


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreFlywheel

expand_moreAudi gasoline straight-4 1.8 L DZ 110 HP


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Second stage	90°90°90°

expand_moreAudi gasoline straight-4 2.0 L AAD 114 HP


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Use new screw.
Second stage	90°90°90°

expand_moreAudi gasoline straight-5 2.3 L NG 131 HP


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Use screw-locking compound.
Second stage	100°100°100°

expand_moreAudi gasoline straight-5 2.3 L NG 134 HP


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Use screw-locking compound.
Second stage	100°100°100°


Audi gasoline straight-5 2.3 L 7A 165 HP	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Use screw-locking compound.
Audi gasoline straight-5 2.3 L 7A 168 HP	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Use screw-locking compound.

expand_moreAudi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m

expand_moreWith manual transmission


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace screws.
Second stage	180°180°180°


Main bearing	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m
Use new screws.

expand_moreVibration damper


All Audi gasoline V6 2.8 L AAH engines	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreAll other modifications


Class 10.9	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Class 8.8 screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreEngine control

expand_moreCamshaft timing gear

expand_moreAll Audi gasoline V6 2.8 L AAH engines


Left	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace bolt.
Right	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace bolt.


All Audi gasoline straight-4 1.8 L DZ engines	59 lbf⋅ft59 lbf⋅ft80 N⋅m
All other modifications	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m
Use new screws.

expand_moreDrive belt tensioner device


Audi gasoline straight-4 2.0 L AAD 114 HP	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Audi gasoline straight-5 2.3 L NG 131 HP	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Audi gasoline straight-5 2.3 L NG 134 HP	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreToothed belt guard at the bottom

expand_moreAudi gasoline straight-4 2.0 L AAD 114 HP

expand_moreM6


Nuts	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Otherwise	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m


M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


Audi gasoline straight-5 2.3 L NG 131 HP	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
Audi gasoline straight-5 2.3 L NG 134 HP	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreAudi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m

expand_moreLeft


Top	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m


Otherwise	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreAll other modifications

expand_moreScrews (M6)


Bottom	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreMetal cap at the top


Screws	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m


Nuts	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_morePlastic cap on the top


Screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreToothed belt guard at the top


Screws	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreToothed belt tensioning roller

expand_moreAll Audi gasoline V6 2.8 L AAH engines


M6	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
M8	31.72 lbf⋅ft31.72 lbf⋅ft43 N⋅m


All other modifications	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

expand_moreToothed belt tightener


All Audi gasoline straight-4 2.0 L AAD engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAll Audi gasoline V6 2.8 L AAH engines


M10	31.72 lbf⋅ft31.72 lbf⋅ft43 N⋅m
M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m


All Audi gasoline straight-4 2.0 L ABK engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreEngine lubrication

expand_moreOil drain plug


All Audi gasoline V6 2.8 L AAH engines	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
All other modifications	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

expand_moreOil filter housing


All Audi gasoline straight-4 2.0 L AAD engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
All Audi gasoline V6 2.8 L AAH engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-4 2.0 L ABK engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreOil sump


All Audi gasoline V6 2.8 L AAH engines	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
All Audi gasoline straight-4 1.8 L DZ engines	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
All other modifications	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreEngine management


Knock sensor	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreLambda sensor


All other modifications	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m

expand_moreExhaust system

expand_moreExhaust manifold


Audi gasoline straight-4 2.0 L AAD 114 HP	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Audi gasoline straight-4 2.0 L ABK 114 HP	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Audi gasoline straight-5 2.3 L 7A 165 HP	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Audi gasoline straight-5 2.3 L 7A 168 HP	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Audi gasoline V6 2.8 L AAH 172 HP, 245 N⋅m	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace nuts.
All other modifications	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace nuts.

expand_moreIgnition system

expand_moreSpark plugs


All Audi gasoline straight-4 1.8 L DZ engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
All other modifications	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1991 Audi Coupe 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 Audi 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 Audi Coupe 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 1991 Audi Coupe you're not only saving money, but also also improving your technical skills and learning something new.

1991 Audi Coupe generations

In 1991 Audi offered 2 generations of the Coupe. Engine fastener tightening specifications may vary in different generations. Be sure that you are looking at the rigt modification.

B3

Type 89, Type 8B

1991 Audi Coupe B3 facelift Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

1991 Audi Coupe generations

B3

Audi Coupe B3 facelift model years

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