What is the torque sequence for heads on a 455 olds

Quote:





Originally Posted by norvelplagbao52

1993 saturn sl2 1.9 dohc cylinder head torque
specs and sequence
Cylinder head bolt
tightening procedure:
CYLINDER HEAD BOLT TIGHTENING SEQUENCE:

INTAKE
SIDE
8 4 1 5 9

7 3 2 6 10
EXHAUST SIDE

In sequence,
torque the cylinder head bolts. Torque: 30 Nm (22 ft-lbs).
In sequence,
torque all bolts. Torque: 50 Nm (37 ft-lbs)
In sequence, turn each bolt an
additional 90 degrees.





Originally Posted by norvelplagbao52

1993 saturn sl2 1.9 dohc cylinder head torque
specs and sequence
Cylinder head bolt
tightening procedure:
CYLINDER HEAD BOLT TIGHTENING SEQUENCE:

INTAKE
SIDE
8 4 1 5 9

7 3 2 6 10
EXHAUST SIDE

In sequence,
torque the cylinder head bolts. Torque: 30 Nm (22 ft-lbs).
In sequence,
torque all bolts. Torque: 50 Nm (37 ft-lbs)
In sequence, turn each bolt an
additional 90 degrees.

1998 Isuzu Truck Rodeo 2WD 2.2L MFI DOHC 4cyl

The Head Bolt Torque

Torque sequence ----------------- front ' 7 3 1 5 9 ' of ' ' engine ' 8 4 2 6 10 ' ----------------- Step 1: torque bolts in sequence to 18 Ft/Lbs Step 2: turn bolts in sequence an additional 90-degrees Step 3: turn bolts in sequence an additional 90-degrees Step 4: turn bolts in sequence an additional 90-degrees recheck final torque in sequence

1998 Isuzu Truck Rodeo 2WD 3.2L MFI DOHC 6cyl

The Head Bolt Torque

Torque sequence -------------- front ' 6 1 3 7 ' of ' ' engine ' 5 2 4 8 ' -------------- Step 1: torque to 20 Ft/Lbs Step 2: torque to 47 Ft/Lbs recheck final torque in sequence

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.

Torque sequence: ----------------- there are two rows of fasteners and you need to start with the middle 2 fasteners first and then work your way toward the front and back in steps. Step 1: torque head bolts #1,2,3,4,5,6,7, & 9 in sequence to 10 Ft/Lbs Step 2: torque head bolts #1,2,3,4,5,6,7, & 9 in sequence to 20 Ft/Lbs Step 3: torque head bolts #1,2,3,4,5,6,7, & 9 in sequence to 29 Ft/Lbs Step 4: turn all head bolts in sequence an additional 90 degrees Step 5: turn all head bolts in sequence an additional 90-degrees recheck final torque in sequence. Fasteners are supposed to be replaced if they are removed since they are torque-to-yeild fasteners.

7 - 5 - 1 - 3 - 10
front
9 - 4 - 2 - 6 - 8

Torque sequence ----------- ' 9 7 3 1 5 ' ' 8 4 2 6 ' ----------- Step 1: torque in sequence to 45 Ft/Lbs Step 2: torque in sequence to 65 Ft/Lbs Step 3: torque in sequence to 65 Ft/Lbs again plus 1/4 turn Step 4: Torque small bolt in rear of head to 25 Ft/Lb 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.
3.3L

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!

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:

1. In sequence, torque all bolts to 30 ft.-lbs.
2. In sequence, rotate all bolts an additional 70 degrees.
3. In sequence, rotate all bolts an additional 60 degrees.
4. In sequence, rotate all bolts another 60 degrees.
5. Torque the front three M6 head bolts to 106 in.-lbs.

22 - 24 ft. lbs. for the rod caps and....
Cylinder Head Tightening Torque and Sequence.

Tighten cylinder head bolts in order shown.
Tightening torque: 36.1 ft. lbs. (49 Nm, 5 kg-m)

Loosen bolts in reverse of order shown.

Retighten cylinder head bolts in order shown.
Tightening torque: 18 ft. lbs. (25 Nm, 2.5 kg-m)

Mark cylinder head bolts for rotational reference.
Rotate cylinder head bolts 90°(1/4 Turn) in order shown.

CAUTION:

• Do not reuse the old cylinder head bolts.

Fig. : Cylinder head torque sequence, 260, 307, 350 403 Oldsmobile built engines




On the V8, tighten the bolts, in the sequence illustrated, to 100 ft. lbs. When all bolts have been tightened to this figure, begin the tightening sequence again, and torque all bolts to 130 ft. lbs.

On V6's, tighten all head bolts in sequence to the following torques:
* All except bolts 5, 6, 11, 12, 13 and 14 - 100 ft. lbs.(19-135.5 Nm)
* Bolts 5, 6, 11, 12, 13, and 14 - 41 ft. lbs. (19-55.5 Nm)
* All bolts except 5, 6, 11, 12, 13, and 14 - 142 ft. lbs. (19-192.5 Nm)
* Bolts 5, 6, 11, 12, 13, and 14 - 59 ft. lbs. (19-80 Nm)



Hope this help (remember comment and rated this).

1976 OLDSMOBILE TORQUE SPECS
455 CI cylinder head torque 85 ft/lbs
455 CI intake manifold torque 40 ft/lb

Hope this helps