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Assume you are needing the cylinder head torque specs?
The head bolts are angular torqued and best practice is to fit new bolts and ensure all the female threads are thoroughly cleaned. I recommend greasing the bolt threads and washer faces.
The initial torque (following a spiral pattern) is 25 NM followed by angular movements of (degrees) 90 + 90 + 90 + 45
I generally start the engine and thoroughly warm up and allow it to cool before the final 45.
Head bolts are typically a Torque Angle to Yield specification, an example 100NM plus 75 to 100 Degrees of angle. You should be able to reuse the bolts, assuming that they have not been reused before. The bolts are plastically deformed when they go into yield, typically you can reuse them 1 to 2 more times. It is stated in the service manual to replace the bolts because it is never known how many times in the past they may have been retightened. So if you have a good history of the vehicle, and know that the head has not been removed, your pretty safe to reuse.
Hi Moz, Make sure to use replacement bolts or if reusing, make sure none have stretched. The torque settings for the "A" series engine is 27 NM. After tightening to that torque, paint a dot of white paint onto each bolt head facing directly forward. Further torque settings use angle settings. Continue tightening a further 90 degrees. When all bolt have been tightened a further 90 degrees, continue an additional 90 degrees, (180 degrees) until painted dots on each bolt head face backwards. No re-torquing is required. Regards John
Cylinder head torque
Bolts 1-8 40 lb ft.
Bolts 9-10 30 lb ft
Tighten all bolts an additional 90 degrees.
Note this info cam from Mitchel
These bolts are torque to yield meaning they must be replaced after torquing once. In other words the are single use bolts. DO NOT reuse them!
Hope this helps
When torquing items today very little is done with just "numbers" in the process. Now you have to have an angle meter to complete the process so when you see me say to torque a specific number "plus so many degrees", this is how it's done. This is the meter:
Now, Here are the specs for installing the head:
Cylinder Head Bolt
22 lb ft
Here is the sequence shown in picture form:
Also, you will need to discard the old bolts because they are "torque to yeild" bolts and CANNOT be reused. The reason: "Torque to yeild" bolts actually stretch during the torque process and once they've gone through this process they can't be reused because they no longer are able to "clamp" the head because they are too long. Hope this helps your repair project.