Service nmanual for 2001 opel/astra 2.2litre 16valve petrol engine

There are hundreds of nuts and bolts on any vehicles. Each one can be a different Torque setting. We can't help unless we know exactly which nut or bolt your referring to. If there are lots of settings you need to know buy a decent workshop manual and that will give you all the torque settings for the vehicle.

Using new bolts the sequence is :-
stage 1. 25Nm (18lbf ft)
stage 2. Angle tighten 90 degrees
stage3. Angle tighten another 90 degrees
stage4. Angled tighten another 90 degrees
stage5. Angle tighten a further 45 degrees
these as same for 1.4. 1.6 and 1.8 engines but not 2.0

BOLT INSTALLATION


Apply engine oil to the thread of the bolts and to the washers.
Tighten the bolts to the specified torque, using the tightening sequence shown.
Tightening torque: 54 ft-lb +/- 2 ft-lb
Loosen all bolts fully in the reverse order of tightening.
Re-tighten the loosened bolts to the specified torque in the tightening sequence shown.
Tightening torque: 15 ft-lb +/- 1 ft-lb
This step is to make it easier to ensure you are making 90 degree turns. Make a paint mark across each bolt head and cylinder head.
Tighten the cylinder head bolts 90 degrees in the specified order.
Tighten the bolts another 90 degrees in the specified order and check that the paint marks on the cylinder head bolts are aligned with the paint marks on the cylinder head.
Link to the guide for this engine: http://www.mivec.co.nz/tech/4G9x_Engine_Manual.pdf

Tighten the cylinder head bolts. Tighten the cylinder head bolts is sequence to 29 Nm (3.0 kgf-m, 22 ft. lbs.). Use a beam-type torque wrench. When using a preset type torque wrench, be sure to tighten slowly and do not overtighten. If a bolt makes any noise while you are torquing it, loosen the bolt and retighten it. Make sure the threads are clean, new heads bolts are best.

Hi there:



Fig. Cylinder head bolt loosening sequence - Altima & Maxima 3.5L engine

Install the cylinder head bolts and torque in sequence as follows:

1. Step 1: 72 ft. lbs. (98 Nm).
   
2. Step 2: Completely loosen all bolts.
   
3. Step 3: 26-32 ft. lbs. (34-44 Nm).
   
4. Step 4: plus 90-95 degrees clockwise.
   
5. Step 5: plus 90-95 degrees clockwise.

Fig. Right cylinder head bolt torque sequence- Altima & Maxima 3.5L engine




Fig. Left cylinder head bolt torque sequence- Altima & Maxima 3.5L engine

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Tighten the cylinder head bolts to their final torque specification in two steps. Use a crisscross sequence starting with the bolts at the middle of the head and working toward the outer bolts.

1. Step 1: Tighten each bolt to 22 ft. lbs. (30 Nm).
   
2. Step 2: Tighten each bolt to 61 ft. lbs. (85 Nm).

Fig. Cylinder head bolt loosening sequence - 1.6L (B16A2) engines (click image for zoom)

Hope helps.

I cannot find a EL20B in my data,but all Astra listed had the same head sequence as shown:

10 6 2 3 7

9 5 1 4 8

the torque specs for the C20XE,C20NE,X20XEV were all
25nm(18lb/ft),-then 90 deg,-90deg,-90deg.
Z20LET were as above plus an additional 15deg.
Same data for smaller and larger engines(except a couple that were 45deg instead of 15)
Make sure that you replace the head bolts with new,they are torque to yield bolts that are designed to stretch to 'plastic' state,and should not be reused.
Put grease(graphite if you have it) under bolt heads and washers,oil the threads.
Usually the head sets come with the torque specs.
I hope this helps you.

Cylinder heat bolt torque:
Torque sequence --------- front | 7 3 1 5 | | 8 4 2 6 | --------- Step 1: Torque all bolts in sequence to 14 Ft/Lbs Step 2: Torque all bolts in sequence to 29 Ft/Lbs Step 3: Torque all bolts in sequence to 36 Ft/Lbs Step 4: in the sequence, loosen the cylinder head bolts three turns. Step 5: Tighten short bolt to 15 - 32 Ft/Lbs Step 6: Tighten long bolt to 30 - 36 Ft/Lbs Step 7: Tighten all bolt to 175- 185 degree note: Do not loosen all of the cylinder head bolts at one time. Each cylinder head bolt must be loosened and the final tightening prior on the next bolt in the sequence.
Main bearing torque:
Torque sequence: Step 1: torque bolts to 91 Ft/Lbs with the exception of the rear main bearing cap Step 2: torque rear main bearing cap bolts to 88 Ft/Lbs Step 3: torque brace bolts to 40 Ft/Lbs
Connecting rod torque:
Torque sequence Step 1: Torque to 29 Ft/Lbs Step 2: Turn an additional 90 degrees

Tighten in sequence to 29ft.lbs then tighten in sequence to 58ft lbs. then loosen all bolts. Then tighten in sequence to 33ft lbs. then tighten each bolt in sequence 90 degrees then tighten each bolt again 90 degrees