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on a 2002 2.4 engine head bolts are 'torqued to distance'.
First, install all the bolts, and, in a sequential fashion, starting at
the innermost, working outward, torque all bolts to 70 N-m/806 kgf-cm/58
foot lbs.
Next, mark the front side of each head bolt with a dot of paint.
Retighten the cylinder head bolts 90 degrees, starting at the inner 2,
and working outward.I dont thin anything has changed on this engine since then.
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
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
First Pass
30 N·m
22 lb ft
Final Pass
155 degrees
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.
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