Question about 2003 Chevrolet TrailBlazer
For 2003 Chevrolet Truck Trailblazer 4.2L SFI DOHC 6cyl tighten the cylinder head bolts in sequence as follows:
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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Posted on Jan 02, 2017
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Oct 12, 2011 | 1999 Chevrolet Malibu
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!
Feb 06, 2011 | 1998 Mazda Pickup
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
Six IN V - 6V
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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