if it is a K series engine as I imagine it will be the torque setting is, in 3 stages,first 15lbft/20Nm , second mark bolt heads and turn all half turn (180 degrees) third and then half turn again. Looking into the engine from the front of the car, left is the timing belt end, back row is nearest the windscreen then the tightening sequence is back row left to right 9,5,1,3,7 front row left to right 10,6,2,4,8
at are torque settings for QG16 nissan almera
For the 3.9 head bolts (streach bolts) only use new bolts and follow this sequence: Tighten to 20nm in correct sequence. Then tighten each bolt 90 deg turn in correct sequence. Wait 15 minutes. Then tighten each bolt a further 90 deg turn in correct sequence. Done.
firstly tighten in sequence to 20Nm all round, then tighten to 30Nm all round,then tighten 90 degrees all round, and finally tighten a further 90 degrees all round. good luck!.
The torque settings for aluminum head are; stage 1. 15lb ft. Stage 2 you have to set the correct torque level by angular measurement, angle tighten a further 240 degrees. Cylinder head tightening sequence is important if you do not want to warp the head. Get down to your local library go to the technical section and photocopy the section from the Haynes manual
You start in the middle of the head and work your way out to each end in sequence left then right. You tighten them in 3 steps. Step 1 tighten to 50 ft/lbsStep 2 tighten to 60 ft/lbsStep 3 tighten to 75 ft/lbs.http://www.classicinlines.com/SmallSixSpecs.asp
Tighten the bolts to 60 nM (44 ft. lbs.) in sequence. Tighten the bolts to 60 nM (44 ft. lbs.) in sequence.
Tighten the cylinder head bolts in three steps using the sequence provided : ==== ==== # Step 1- Snug tighten M12 cylinder head bolts, in sequence, to 34 N·m (25 ft. lbs.) and M8 bolts to 20 N·m (15 ft. lbs.) torque. # Step 2- Tighten M12 cylinder head bolts, in sequence, to 54 N·m (40 ft. lbs.) and verify M8 bolts to 20 N·m (15 ft. lbs.) torque. # Step 3- Turn M12 cylinder head bolts, in sequence, 90 degrees and tighten M8 bolts to 34 N·m (25 ft. lbs.) torque.
First, buy new headbolts as they can only be used once. Then apply 3-in-1 oil to the threads and underside of the bolt head. In a prescribed sequence, tighten the cylinder head bolts to 35 lb ft. Then completely loosen them and tighten (in sequence) to 15 lb.ft. Then tighten them 90 degrees (from 3 o'clock to 6 o'clock.) Then tighten them 90 degrees again.
It is strongly recommended that new head bolts are used with threads LIGHTLY oiled.use an angle gauge to measure tightening angels.If your motor is fitted with hexagonal headed bolts-1) tighten in correct sequence to 58Nm2) slacken 1st bolt in sequence then immediately tighten to 20Nm then immediately through 120 degrees, proceed in this way until all bolts tightened3)refit all of the rest of the engine components ensure that all fluid levels are correct and its safe to start motor.start motor allow it to idle until cooling fan starts.switch off motor allow it to cool for a minimum of two hours.4)repeat process described in number 2) above.That's it done.If fitted with Torx type bolts,from early 19871)tighten in sequence to 60Nm2)slacken all bolts then tighten each in sequence to 20Nm3)further tighten in sequence each bolt through 300 degreesjob done no need for re-tightening after warm up.
stage one 25Nm stage two tighten a further 90 degees stage three tighten a further 90 degrees stage four tighten a further 90 degrees stage five tighten a furthe 45 degrees
Make sure you have the correct sequence Step 1 Short Bolts 43 Long Bolts 46 Step 2 Tighten an additional 90-degrees
Tighten the bolt in the sequence until each is torqued to 49 Nm, then completely loosen all the bolt then re-tighten them in sequence once again until each torqued 20 Nm. tighten each bolt again by 90 degree in accordance with the tightening sequence. After that tighten each bolt again by 90 degree in accordance with the tightening sequence. Some mechanics will refer this method as "20+90deg+90deg"