The head torquing sequence for any cylinder head is as below, continue the pattern if there are more than 10 bolts:-
10 6 1 3 7
8 4 2 5 9
Start at the middle two bolts and do your sequence at least three times, first at about half the torque, then the full torque value at least twice. It is good practice to re torque the head again after about 1000 km (600 miles), but this is often disregarded due to the problems of getting to the head bolts.
The torque values are:- first torque 14 ft/lbs, second torque 43 ft/lbs, and then turn each bolt an additional 90 degrees in the same sequence. Apply a lite coat of oil to the threads before inserting them onto the holes. I see that the numbers did not quite line up as originally laid out. The top row is 10, 6, 1, 3, 7 and the bottom row is 8, 4, 2, 5, 9. and the figures should be above/below each other. Numbers 10 and 8 represent the front two bolts.
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Fig. Cylinder head torque sequence-5-cylinder engines
Install the lower cylinder head with a new gasket. Tighten the bolts in sequence as follows:
hope helps.
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!
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