Question about 2002 Nissan Altima
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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
SOURCE: i recently blew a head
Below I posted the information you needed. The cam is easy, just do it in order and by the torque specs. the cylinder head you must be very detailed with and follow the indtructions to the letter or you will be waisting your time. If you have any other questions or need any pictures feel free to email me at firstname.lastname@example.org and be detailed as to what you need so I'm sure to send the right stuff. I hope this helps and good luck. By the way since you have the engine pretty much torn down, have you thought about the oil pump as well. that engine is famous for them going and would think about replacing as well to be on the safe side. I believe the cost including a new timing cover with it is about $150.00. It might be worth the extra $$$ while you're putting so much into it already....Just a thought. Do this for a living and have seen it a lot.
Posted on May 14, 2011
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