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Re: head bolt torque spec
STARTING OUT YOU HAVE TO REPLACE THE OLD BOLTS DUE TO STRETCHING.BESURE TO USE NEW BOLTS LUBRICATE NEW BOLTS IN OIL.BESURE TO USE TORQUE SEQUENCE GUIDE OR PHOTO.YOU GOING TO MAKE THREE PASSES * FIRST* PASS YOU TORQUE ALL HEAD BOLTS TO 12 TO 18 FT LBS * SECOND *PASS YOU TORQUE ALL BOLTS TO 26 TO 33 FT LBS.*THIRD PASS YOU TORQUE IT TO 44 FT LBS.THATS THE FINAL TORQUE.
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Click on the link, This generic spec according to bolt size and thread. A 1/4 inch bolt and up are ft lbs. I generally just tighten it up good. I realize good isn't a spec.
I did look in my database didn't see the torque spec for tensioner, itself.
Step 1 14 ft.lbs Step 2 29 ft.lbs Step 3 36 ft.lbs Step 4 loosen 3 revolution and torque in sequence, one bolt at a time, and torque to next step. Step 5 short bolts 15-32 ft.lbs long bolts 30-36 ft.lbs Step 6 additional 175-185 degrees.
Torque new cylinder head bolts in sequence to 44 ft lb. Loosen bolts approximately two turns, then torque bolts in sequence to 44 ft lb. Turn bolts an additional 90 degrees in sequence, then an additional 90 degrees
The aluminum heads on a cast iron block require some gentle torque procedures.... It may not be necessary - but I suggest that you start near the center of the head and work out with each tightening step. This will ensure that you don't put too much pressure on a single portion of the head. The standard proceedure for the 3.8 V6 up until 1994 is as follows:
You will have some long and some shorter head bolts. Place a small mark on the long bolts to identify them during the final torque proceedure.
Step 1: 15 (on all bolts) Step 2: 29 (on all bolts) Step 3: 37 (on all bolts) Step 4: Now, starting near the center of the head, loosen a single head bolt about 2 turns. Now, torque it down to about 15 (+/- 3 lbs) IF A LONG BOLT.
OR 11 (+/- 3 lbs) IF A SHORT BOLT. Step 5: After all bolts are set as described above, ....go over them 1 more time, starting near the center of the head and pull each bolt down another 1/4 turn (90 degrees). You are done!!