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Torque sequence ---------------- | 9 3 1 6 8 | | 7 5 2 4 10 | ---------------- Step 1: Torque in sequence 22 Ft/Lbs Step 2: Torque in sequence 58 Ft/Lbs Step 3: Loosen all bolts completely Step 4: Retorque all bolts in sequence 22 Ft/Lbs Step 5: Retorque all bolts in sequence 54-61 Ft/Lbs recheck final torque in sequence *** CAUTION *** engine uses Torque To Yield head bolts (TTY) that permanently stretch during the initial installation. New head bolts must be used when cylinder head is replaced or re-installed to obtain proper torque.
Big difference between valve cover gasket and head gasket. To replace head gasket, you must dissamble top end of engine and send the head out to be resurfaced and then install new head gasket. If it is a leaking valve cover it is much easier. Simply dissasemble and then clean valve cover and top of head from all debris and remove all old gasket material. Tighten back down in sequence and do not over tighten. these small bolts can be overtightened easily so go in sequence just like when you tighten lug nuts by skipping one as you go around. 10mm bolts require about 10 pounds or less torque.
Fig. Cylinder head bolt loosening sequence - Altima & Maxima 3.5L engine
Install the cylinder head bolts and torque in sequence as follows:
Step 1: 72 ft. lbs. (98 Nm).
Step 2: Completely loosen all bolts.
Step 3: 26-32 ft. lbs. (34-44 Nm).
Step 4: plus 90-95 degrees clockwise.
Step 5: plus 90-95 degrees clockwise.
Fig. Right cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Fig. Left cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
Fig. Cylinder head bolt loosening sequence - Altima & Maxima 3.5L engine
Install the cylinder head bolts and torque in sequence as follows:
Step 1: 72 ft. lbs. (98 Nm).
Step 2: Completely loosen all bolts.
Step 3: 26-32 ft. lbs. (34-44 Nm).
Step 4: plus 90-95 degrees clockwise.
Step 5: plus 90-95 degrees clockwise.
Fig. Right cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Fig. Left cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Hope this helps; also keep in mind that your feedback
is important and
I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
Fig. Cylinder head bolt loosening sequence - Altima & Maxima 3.5L engine
Install the cylinder head bolts and torque in sequence as follows:
Step 1: 72 ft. lbs. (98 Nm).
Step 2: Completely loosen all bolts.
Step 3: 26-32 ft. lbs. (34-44 Nm).
Step 4: plus 90-95 degrees clockwise.
Step 5: plus 90-95 degrees clockwise.
Fig. Right cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Fig. Left cylinder head bolt torque sequence- Altima & Maxima 3.5L engine
Hope this helps; also keep in mind that your feedback
is important and
I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
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!
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