What are the head torque settings and sequence?

2013 CHEVROLET SPARK
145,500 MILES • 1.2L • 4 CYL • 2WD • MANUAL
Avatar
NATASHA BOUCHER
  • MEMBER
  • 6 POSTS
Hi, my partner and I worked on my car the whole weekend. Chevrolet has been discontinued in South Africa, so finding proper help is a challenge. The head gasket blew, had it skimmed, bought a new head gasket, aftermarket, and everything is straight assembled. The car started; it runs beautifully but it is leaking oil under the manifold at the gasket seal. I suspect that because we did not replace the bolts this could be a problem and also. the torque sequence and settings might have been received wrong on Google. Please may you assist.
Natasha
Oct 9, 2022 at 10:35 PM
Advertisement
Avatar
BORIS K
  • CERTIFIED EXPERT
  • 836 POSTS
Hello,

The cylinder head bolts need to be replaced as they are stretch bolts.
Once new bolts are fitted torque then to an initial spec of 22 Nm, 16 lb ft.
The second stage is an angle of 82 degrees using an angle attachment, see image below.
Please ensure that you tighten the head bolts in sequence, see image 2 below.

Hope this helps.

Cheers, Boris
Images (Click to enlarge)
Attached Media
Attached Media
Oct 10, 2022 at 4:29 AM
Avatar
NATASHA BOUCHER
  • MEMBER
  • 6 POSTS
Thank you Borris, I will only be able to apply this on the weekend. So, my understanding is then that the sequence is not crossover but according to the numbers on the diagram?
Natasha
Oct 10, 2022 at 7:47 AM
Advertisement
Avatar
BORIS K
  • CERTIFIED EXPERT
  • 836 POSTS
Hello,

Yes, the tightening sequence is as per diagram.
Directly from Chevrolet's workshop manual.

Cheers, Boris
Oct 10, 2022 at 8:23 AM
Avatar
NATASHA BOUCHER
  • MEMBER
  • 6 POSTS
Thank you!!!
Oct 10, 2022 at 11:10 AM
Avatar
NATASHA BOUCHER
  • MEMBER
  • 6 POSTS
Hi Boris, thank you! My car is running x.
Oct 18, 2022 at 2:28 AM