Cylinder head bold torque specs?

Tiny
JUNIOR101
  • MEMBER
  • 2005 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 180,556 MILES
I can’t find them anywhere. Please help me out.
Thursday, September 12th, 2019 AT 3:55 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Here are the directions and torque specs for your vehicle as well as the tightening sequence: Check out the diagrams (Below).

Cylinder head bolts
Step 1. 50.0 Nm (5.1 kg-m, 37 ft. Lbs.)
Step 2. 60° clockwise
Step 3. 0 Nm (0 kg-m, 0 ft. Lbs.) (Loosen)
Step 4. 34.3 - 44.1 Nm (3.5 - 4.4 kg-m, 26 - 32 ft. Lbs.)
Step 5. 75° - 80° (target: 75°) clockwise
Step 6. 75° - 80° (target: 75°) clockwise

Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between d1 and d2 exceeds the limit, replace the bolts with new ones.
If cylinder head bolts are re-used, check their outer diameters before installation.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Thursday, September 12th, 2019 AT 8:14 PM
Tiny
LUCAS76
  • MEMBER
  • 1 POST
  • 2004 NISSAN ALTIMA
How much do you torque the head bolts [psi]
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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS


https://www.2carpros.com/forum/automotive_pictures/261618_Noname_1875.jpg



https://www.2carpros.com/forum/automotive_pictures/261618_Graphic_384.jpg

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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)
Tiny
MASTERDRAGONLORD
  • MEMBER
  • 1 POST
  • 2002 NISSAN ALTIMA
  • 198,000 MILES
What is the torque spec for the head bolts on a 2.5L engine? I am changing the head gasket and can not find the torque specs for the head bolts anywhere. If you could help me with this issue I would appreciate it greatly! Thank you.
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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,642 POSTS
Here is the instructions and some diagrams (below) to help you get the problem fixed.

Apply new engine oil to the threads and the seating surfaces of mounting bolts.

Tighten all bolts to 98.1 Nm (10 kg-m, 72 ft. Lbs.).
Completely loosen all bolts as shown in the figure.
Retighten all bolts to 34.3 - 44.1 Nm (3.5 - 4.4 kg-m, 26 - 32 ft. Lbs.).
Turn all bolts 75°- 80°degrees (target: 75°degrees) clockwise.

Keep in mind Nm stands for newton meters. It is just a different measurement scale then foot lbs.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)
Tiny
ALEXADAME
  • MEMBER
  • 1 POST
It was really helpful!

Thanks Ken
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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,642 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Tuesday, May 25th, 2021 AT 6:08 PM (Merged)

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