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I have a 1998 Holden Astra eng noEL20B24119 and want to know the Head bolt torque settings and sequence. The engine is the transition model with twin tappet cover seals. has the torx star headed bolts.

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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.

Posted on Apr 02, 2011

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Http://manualfile.com/automotive/vauxhall-opel-vectra-1995-1999-service-manual.html

Go to this site.A lot of the cars are astra/vectra and you find all the info you will ever need.Search through it to the astra section.The vectra is also a Vauxhal,Opel or Chevrolet.All exactly the same car.This is the same for Astra.
Hope this helps

Posted on Apr 02, 2011

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