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What is the proper cylinder head torque value and sequence for the chev 4.2liter inline six? year 2003.

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For 2003 Chevrolet Truck Trailblazer 4.2L SFI DOHC 6cyl tighten the cylinder head bolts in sequence as follows:

  1. Tighten the long bolts (1-14), in sequence, to 30 ft. lbs. (40 Nm).
  2. Tighten the long bolts, in sequence, an additional 90 degrees.
  3. Tighten the long bolts, in sequence, an additional 60 degrees.
  4. Tighten the 2 long end bolts to 15 ft. lbs. (20 Nm).
  5. Tighten the 1 short end bolt to 13 ft. lbs. (18 Nm).

what is the proper cylinder head torque value and - bd45748.jpg

Fig. Cylinder head bolt tightening sequence-4.2L engine (click for zoom).


Hope this help to solve it.

Posted on Sep 14, 2010

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Head bolt sequence and torque values on a 1999 Chevy 3.1L engine


if the 8th number om your VIN is a "J" then this is the correct prossess 3.1LTorque sequence --------- ' 6 2 3 7 ' ' 5 1 4 8 ' --------- Step 1: torque in sequence to 37 Ft/Lbs Step 2: turn an additional 90 degrees recheck final torque in sequence *** CAUTION ***engine uses Torque To Yield head bolts (TTY) thatpermanently stretch during the initial installation.New head bolts must be used when cylinder head isreplaced or re-installed to obtain proper torque.Always coat bolt threads with the proper sealant.

if the 8th number on your VIN is a "M" then this is the correct prossess 3.8LTorque sequence --------- ' 6 2 3 7 ' ' 5 1 4 8 ' --------- Step 1: torque in sequence to 37 Ft/Lbs Step 2: turn an additional 90 degrees recheck final torque in sequence *** CAUTION ***engine uses Torque To Yield head bolts (TTY) thatpermanently stretch during the initial installation.New head bolts must be used when cylinder head isreplaced or re-installed to obtain proper torque.Always coat bolt threads with the proper sealant.

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Correct pressure for torque the head of mazda pickup 1998


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.



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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









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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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1 Answer

Can you tell me the torque spec.on head bolts for a 1985 ltd 3.8 thank you


Six IN LINE - 6L

zjlimited_510.jpg

Fig.: Cylinder head torque sequence - 6 -cylinder engine



Cylinder head torquing should proceed in three steps and in the prescribed order. Tighten them first to 50-55 ft. lbs. (65-71 Nm), then give them a second tightening to 60-65 ft. lbs. (78-84 Nm). The final step is to 70-75 ft. lbs. (91-97 Nm), at which they should remain undisturbed.


Six IN V - 6V

zjlimited_511.jpg

Fig.: Cylinder head bolt torque sequence - 6 -cylinder engine

Tighten the head, according to the illustrated sequence in three progressive steps. Tighten the bolts to 50-55 ft. lbs. (68-74 Nm), then 60-65 ft. lbs. (81-88 Nm) and finally to 75 ft. lbs. (102 Nm).


Hope this helps (remember to rate and commene this answer).

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What is the toqrque spechs and order for a Northstar 4.6 engin for both head and main & rod barngs. Does the main barnings have a order


If you have to pull a cylinder head on a 1993-1999 4.0L or 4.6L Northstar V8 to replace a gasket or do a valve job, do not reuse the old 11mm head bolts. Also, GM has revised the head bolt torque values and tightening procedure as follows:
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  2. In sequence, rotate all bolts an additional 70 degrees.
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Please don't forget to rate. Thank you:

Left side front cylinder head


98e175a.gif
Cylinder head bolt torque sequence-3.4L engine

  • Cylinder head by aligning it with the dowel pins
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    71cd5b7.gif
    Cylinder head bolt torque sequence-3.4L engine


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    Please don't forget to rate. Thank you:

    Left side front cylinder head


    98e175a.gif
    Cylinder head bolt torque sequence—3.4L engine

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    71cd5b7.gif
    Cylinder head bolt torque sequence—3.4L engine


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    http://www.anubiscycle.com/fixya/99cavheadsquence.png

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