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Isuzu does not list specific torque values for these fasteners. When this is the case, you are expected to use standard torque values. These can be found on the chart I have linked below. Be advised that bolt sizes go by the diameter of the shaft [round shaft portion] of the bolt or stud, NOT the hex head [socket size] of the bolt or nut. Partially remove the bolts so that you can measure the shaft and obtain the correct torque from the chart. See
Torque Specifications for Ford 4.2L-256ci-V6 These bolts are torque and turn procedure! STEP 1: 14 FtLbsSTEP 2: 29 FtLbsSTEP 3: 36 FtLbsSTEP 4: LONG Bolts Loosen 3 Turns - re-torque to 33FtLbsSTEP 4: SHORT Bolts Loosen 3 Turns - re-torque to 19FtLbsSTEP 5: ALL Bolts +180deg turn
heres the torque specs and the way to tighten the head bolts for your 1998 toyota sienna, hope this helps,
12 point bolts step 1- 40 ft lbs
step 2- additional 90 degrees
recessed bolt 13 ftlbs
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