Crankcase mounting bolts: Upper Case 10Nm, Lower Case 25Nm
25nm then 3 x 60 degrees
intake nut 89lb .in stud 106.lb.in plenum is 25nm
corsa 1,3ie,nv or sv motor,head settings 25nm @ 60deg + 60 deg + 60 deg
25nm on all 4 bolts 1, 2 , 3 , 4 then 90 degrees and 90 degrees
For this one you'll need a torque wrench and an angle gauge. Hope you are familiar with these. The values are 25Nm+600+600+600. These are from General Motors workshop manuals so I trust them 101%. G.Ikenye
Astra F stage 1. 25Nm stage 2. + 60 degrees Stage 3. + 60 degrees Stage 4. + 60 degrees.
Using new head bolts & lubing the threads tighten to 25Nm then a further 90 degrees+ another 90+ another 90+ 45 degrees.
Mains stage 1. 35Nm stage 2. 70Nm Big Ends stage 1. 25Nm stage 2. 50Nm.
New head bolts must be used Stage1. 25Nm Stage2. +90 degrees Stage3. +90 degrees Stage4. +90 degrees.
Big end 1, 25nm 2, 100 + 15 deg Main 1, 44nm 2, 88nm :)
Torque depends on the size of the bolt as you have already specified grade 8.8. Here are some recommended settings: M8 (13mm across the flat head) 25Nm M10 (17mm across the flat head) 49Nm M16 (24mm across the flat head) 210Nm