1991 Audi 80 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 other modifications	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAuxiliary assemblies

expand_moreAuxiliary drive belt tensioner


All Audi gasoline V6 2.8 L AAH engines	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m

expand_moreAll Audi gasoline straight-5 2.3 L NG engines


Nuts	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


All other modifications	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAuxiliary drive belt tensioner


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

expand_moreAll other modifications


Screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAlternator

expand_moreAll Audi diesel straight-4 1.9 L AAZ engines


Screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAll Audi gasoline straight-4 2.0 L ABK engines

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_moreAll Audi gasoline straight-5 2.3 L NG engines

expand_moreAlternator


Screws	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m


Screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Tensioning screws	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m

expand_moreAll other modifications


Screws	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m


Servo pump pulley	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreServo steering pump

expand_moreAll Audi gasoline straight-4 2.0 L ABK engines


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

expand_moreAll Audi gasoline straight-5 2.3 L NG engines


Retaining clamp	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCarburetion

expand_moreInjection nozzle (injector)


All Audi diesel straight-4 1.9 L 1Z engines	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
All Audi diesel straight-4 1.9 L AAZ engines	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m

expand_moreCylinder head

expand_moreCamshaft bearing


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

expand_moreCylinder head screws

expand_moreAll Audi diesel straight-4 1.9 L AAZ engines

Figure 1. Cylinder head, Cylinder head screws, Audi diesel straight-4 1.9 L AAZ.


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace screws. See figure 1.
Second stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Third stage	90°90°90°
Fourth stage	90°90°90°

expand_moreAll other modifications


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Replace screws. See figure 1.
Second stage	180°180°180°

expand_moreVariant 2


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


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

expand_moreEngine block

expand_moreConnecting rod bearing

expand_moreAll Audi gasoline straight-5 2.3 L NG engines


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

expand_moreAll other modifications


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

expand_moreCrankshaft central screws

expand_moreAll Audi gasoline V6 2.8 L AAH engines


First stage	147.51 lbf⋅ft147.51 lbf⋅ft200 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreAll Audi gasoline straight-5 2.3 L NG engines


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

expand_moreAll other modifications


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

expand_moreCrankshaft pulley


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

expand_moreAll other modifications

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

expand_moreDrive plate


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

expand_moreFlywheel

expand_moreAll Audi gasoline V6 2.8 L AAH engines

expand_moreDual-mass flywheel


First stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreAll other modifications


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

expand_moreMain bearing

expand_moreAll Audi gasoline V6 2.8 L AAH engines

expand_moreCenter screws


Second stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m
Tighten the screws evenly from inside to outside in several steps.
Third stage	90°90°90°
Replace screws.

expand_moreLateral-fitting


First stage	Tighten by hand
Fourth stage	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m


All Audi gasoline straight-5 2.3 L NG engines	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m

expand_moreAll other modifications


First stage	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreVibration damper


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

expand_moreAll Audi diesel straight-4 1.9 L AAZ engines


Class 10.9	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m
Class 8.8 screws	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m


All Audi gasoline straight-5 2.3 L NG engines	14.75 lbf⋅ft14.75 lbf⋅ft20 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 drive belt deflection pulley


All Audi diesel straight-4 1.9 L 1Z 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 diesel straight-4 1.9 L AAZ engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreCamshaft timing gear


All Audi diesel straight-4 1.9 L 1Z engines	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

expand_moreAll Audi gasoline V6 2.8 L AAH engines


First cylinder row	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace screws.
Second cylinder row	51.63 lbf⋅ft51.63 lbf⋅ft70 N⋅m
Replace screws.


All Audi diesel straight-4 1.9 L AAZ engines	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m
All Audi gasoline straight-5 2.3 L NG engines	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m
All other modifications	73.76 lbf⋅ft73.76 lbf⋅ft100 N⋅m

expand_moreDrive belt tensioner device


All Audi gasoline straight-5 2.3 L NG engines	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreAll other modifications

expand_moreScrews


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

expand_moreToothed belt guard at the bottom

expand_moreAll Audi gasoline V6 2.8 L AAH engines

expand_moreLeft


Top	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m


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

expand_moreAll Audi gasoline straight-4 2.0 L ABK engines

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

expand_moreAll Audi gasoline straight-4 1.6 L ABM engines


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


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

expand_moreToothed belt tensioning roller

expand_moreAll Audi diesel straight-4 1.9 L 1Z engines


With semi-automatic tensioning roller	14.75 lbf⋅ft14.75 lbf⋅ft20 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

expand_moreAll Audi diesel straight-4 1.9 L AAZ engines


M10	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m
M8	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m

expand_moreAll Audi gasoline straight-5 2.3 L NG engines

expand_moreM6


Hexagon head screws	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreM8


Hexagon head screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m


Hexagon head screws	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

expand_moreAll other modifications

expand_moreNuts


Tensioning roller	7.38 lbf⋅ft7.38 lbf⋅ft10 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 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 diesel straight-4 1.9 L AAZ 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

expand_moreGlow plugs


All Audi diesel straight-4 1.9 L 1Z engines	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m
All Audi diesel straight-4 1.9 L AAZ engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreKnock sensor


2.0 E with gasoline straight-4 2.0 L 114 HP engine (1991.9–1994.12)	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreLambda sensor


All Audi gasoline V6 2.8 L AAH engines	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m
All Audi gasoline straight-4 2.0 L ABK engines	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m
All other modifications	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreEngine mounting

expand_moreTorque arm

expand_moreAir-conditioning compressor


At the bracket	16.96 lbf⋅ft16.96 lbf⋅ft23 N⋅m

expand_moreAt the crossmember


Front	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m

expand_moreExhaust system

expand_moreExhaust manifold


All Audi gasoline V6 2.8 L AAH engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Replace nuts.
All Audi gasoline straight-4 2.0 L ABK engines	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
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 1.6 L ABM engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
All Audi gasoline straight-4 2.0 L ABT 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 80 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 80 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 80 you're not only saving money, but also also improving your technical skills and learning something new.

1991 Audi 80 generations

In 1991 Audi offered 2 generations of the 80. Engine fastener tightening specifications may vary in different generations. Be sure that you are looking at the rigt modification.

B3

Type 89, Type 89Q, Type 8A

1991 Audi 80 B4 Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

1991 Audi 80 generations

B3

Audi 80 B4 model years

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