I cannot find the torque specs for the head bolts on
My 02 x type 2.5. I have looked everywhere and even called the dealer.
HELP!

 

I need the same information here; how much torque is need for X-Type head bolts? Please some body help!!!

 

If you are re-installing a head, there is a very specific procedure you need to use. The first thing and also the most critical is that you have to get new bolts. PERIOD, END OF STORY. The short of the story is that these engines use "torque to yield" bolts. Ie, once they are tightened, they are actually made stronger because you have physically stretched the bolts, torqued them to yield strength (ie, the point at which they have the most strength and beyond which will fail catastrophically). Unfortunately, they don't snap back once you loosen them. So, if you follow this procedure using the old bolts, you are actually going to torque them beyond their yield point and their strength will drop dramatically and you risk having the head leave the engine upon firing.

INstall a new head gasket (do not reuse the old one as this is taken into account with the procedure) and install all the bolts into their holes.
-tighten all the bolts to 20 nm
-tighten all the bolts to 30 nm
-tighten all the bolts an additional 90 degees
-loosen all the bolts 360 degrees
-tighten all the bolts to 30 nm
-tighten all the bolts an additional 90 degrees
-tighten all the bolts an extra 90 degrees (yes, you are doing two 90 degree turns of the bolt)

Please keep in mind that there is a proper sequence to tightening the bolts. If you look at the top of the head, you will see 8 bolts. Pick and end of the head and number the bolts as shown below:

2 6 8 4
1 5 7 3

Some may also call this a spiral tightening sequence. But, you need to take each step of the above tightening sequence and hit all 8 bolts before you move on to the next step of the tightening sequence. To not follow this is going to result in the bolts having different torques applied to them and possible bolt failure.

One last thing. All these torques are done with the bolts dry, ie, no lubricant used. By adding a lubricant, you can change how much stress is applied to each bolt and based on the properties of most lubricants, you will exceed the yield strength of the bolt and risk breaking bolts. Only with the proper tables and conversions should you apply a lubricant to these bolts and then torque them to the new, proper values.

 

Thanks Thermo, I was about to use the old head bolts, but now I order new head bolts.