2005 Vauxhall Astra TwinTop engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold


All Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Use new screws or nuts

expand_moreAuxiliary assemblies

expand_moreAuxiliary drive belt tensioner


All other modifications	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m

expand_moreCylinder head

expand_moreCamshaft bearing


All Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreCylinder head screws

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines

Figure 1. Cylinder head, Cylinder head screws, Vauxhall gasoline straight-4 1.6 L Z 16 XEP.


First stage	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace screws. See figure 1.
Second stage	90°90°90°
Third stage	90°90°90°
Fourth stage	45°45°45°


Valve cover	5.9 lbf⋅ft5.9 lbf⋅ft8 N⋅m

expand_moreEngine block

expand_moreConnecting rod bearing

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines


First stage	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m
Replace screws and nuts.
Second stage	30°30°30°

expand_moreCrankshaft central screws

expand_moreAll other modifications


First stage	70.07 lbf⋅ft70.07 lbf⋅ft95 N⋅m
Use new screw.
Second stage	45°45°45°
Third stage	15°15°15°

expand_moreFlywheel

expand_moreAll other modifications


First stage	25.81 lbf⋅ft25.81 lbf⋅ft35 N⋅m
Second stage	30°30°30°
Third stage	15°15°15°

expand_moreMain bearing

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines


First stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Replace screws and nuts.
Second stage	45°45°45°
Third stage	15°15°15°

expand_moreEngine control

expand_moreCamshaft drive belt deflection pulley


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

expand_moreCamshaft timing gear

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines


First stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Replace screws and nuts.
Second stage	60°60°60°
Third stage	15°15°15°

expand_moreInlet camshaft wheel


First stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Replace screws.
Second stage	60°60°60°
Third stage	15°15°15°

expand_moreOutlet camshaft wheel


First stage	36.88 lbf⋅ft36.88 lbf⋅ft50 N⋅m
Replace screws.
Second stage	60°60°60°
Third stage	15°15°15°


Toothed belt guard at the bottom	4.43 lbf⋅ft4.43 lbf⋅ft6 N⋅m
Toothed belt guard at the top	4.43 lbf⋅ft4.43 lbf⋅ft6 N⋅m

expand_moreToothed belt tensioning roller


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

expand_moreEngine lubrication

expand_moreOil drain plug


All other modifications	10.33 lbf⋅ft10.33 lbf⋅ft14 N⋅m

expand_moreOil sump

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines


At the gearbox	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
On the engine block	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreEngine management


Camshaft sensor	4.43 lbf⋅ft4.43 lbf⋅ft6 N⋅m
Knock sensor	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreLambda sensor

expand_moreAll Vauxhall gasoline straight-4 1.6 L Z 16 XEP engines


Lambda sensor downstream of catalytic converter	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Lambda sensors in front of catalytic converter	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

expand_moreExhaust system

expand_moreExhaust manifold


All other modifications	16.23 lbf⋅ft16.23 lbf⋅ft22 N⋅m
Replace screws and nuts.

expand_moreIgnition system


Spark plugs	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2005 Vauxhall Astra TwinTop 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 Vauxhall 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 Vauxhall Astra TwinTop 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 2005 Vauxhall Astra TwinTop you're not only saving money, but also also improving your technical skills and learning something new.

2005 Vauxhall Astra TwinTop Fifth generation (MK5) Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

Vauxhall Astra TwinTop Fifth generation (MK5) model years

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