Question about 2005 Nissan Micra Visia
Im assembling the engine, what's the correct torque n sequence for cylinder head bolts
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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
Tighten in sequence to 29ft.lbs then tighten in sequence to 58ft lbs. then loosen all bolts. Then tighten in sequence to 33ft lbs. then tighten each bolt in sequence 90 degrees then tighten each bolt again 90 degrees
Posted on Jul 26, 2009
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Feb 17, 2012 | Nissan Cars & Trucks
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Fig. Fig. 9: Cylinder head bolt torque sequence A
Fig. Fig. 11: Cylinder head bolt torque sequence C
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Since you didn't say which engine you have, I've pulled torque specs for 3 different engines. Also, since I can't include a diagram showing the relative locations of the numbered head-bolt locations, it would be a good idea for you to purchase a vehicle specific repair guide that will show this info.
Take particular note about the TTY (Torque to Yield) bolts used on 2 of the 3 engines shown. It is said that new head bolts MUST BE USED when head is replaced or re-installed to obtain the proper torque.
B2500 4 Cylinder
Torque sequence: --------- ' 10 6 2 4 8
' front ' ' ' 7 3 1 5 9 ' -----------Step 1: torque in sequence to 51
Ft/Lbs Step 2: torque again in sequence to 51 Ft/Lbs Step 3: final
tighten all bolts an additional 90 to 100 degrees 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.
B3000 3.0 6 Cylinder
Torque sequence ---------- ' 6 4 2 8 '
' ' ' 5 1 3 7 ' ---------- Step 1: torque to 59 Ft/Lbs Step 2: loosen
in sequence (1) full turn Step 3: torque to 41 Ft/Lbs Step 4: torque
to 73 Ft/Lbs
B4000 4.0 6 Cylinder
Torque sequence --------- ' 5 1 3 7 ' '
' ' 6 4 2 8 ' --------- Step 1: torque cylinder head bolts in
sequence to 26 Ft/Lbs Step 2: torque cylinder head bolts to 56 Ft/Lbs
Step 3: turn cylinder head bolts in sequence an additional 90-degrees
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.
Good luck with this job!
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