Question about Cars & Trucks
Getting ready torque head bolts
Four steps torque all to 25 then torque to 50 then redo the 50 ft/lb then , last step turn all bolt 90 degrees or a quarter turn this is the order for this
10 6 2 3 7
9 5 1 4 8
have a good day
Posted on Nov 22, 2014
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Posted on Jan 02, 2017
frajogag: First off, be aware that these bolts are "torque to yield" bolts (streach bolts). What this means is that instead of torqueing the head bolts to a specific torque specification, they are torqued down to a set spec and then tightened by rotating the bolts a certain angle, like 90 degrees. and all of them are turned the same amount.
This means that the shanks of the bolts must be checked to make sure they are not too thin (or the bolt has already stretched beyond limits and is prone to snap if used)
Here is how you check the bolts. Measure the bolt using a micrometer, at the base, or within the first 13mm from the end where it threads in. Then go to about 10mm before the threads end heading toward the top of the bolt. There should not be more than a 0.23mm (.0091 inch) or less difference or the bolt should be discarded.
Torque the bolts down to 98.1Nm ( 72.ft lb)
Looking at the head from the side, so you are looking at the full length from side to side, I will number the head bolts in this fashion.
#1 & 2 are directly in front of you and in the center of the cylinder head crossing it width wise.
#3&4 are to the left of #1&2, / #5&6 are to the right of #1&2
#7&8 are to the left of #3&4 / #9$10 are to the right of #5&6
Now, you have the sequence.
After the initial pull, back off all the bolts in the same sequence and then retorque them to 36 Nm ( 28 ft lb)
Using a torque angle wrench or having the ability to accurately judge turning angles. Rotate (clockwise) to a 75 degree angle. do this to all the bolts using the sequence I had provided.
Rotate the bolts (clockwise) 75 degrees again on all bolts in the same sequence. The proceedure is complete!
Posted on Apr 23, 2009
assuming this is the "C" engine 8th digit on VIN plate. Use new bolts. torque first step to 25lbs, 2nd 50lbs, then 3rd 50lbs, then 1/4 turn.
Posted on Sep 23, 2009
The 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 te cylinder head bolts 90 degrees, starting at the inner 2, and working outward.
We hope that this helps you out.
Posted on Dec 29, 2009
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