Question about 1986 Toyota MR2
Head bolt torque sequence
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Posted on Dec 29, 2013
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Posted on Jan 02, 2017
The cylinder head bolt torque is a 2 step process.
First: Torque all of the bolts to 45 Nm (450 Kgf-cm or 33 ft lbs.)
Replace any head bolt that will not torque to the above specs.
Second: after all ten bolts are torqued to the above specs, the head bolts are then "Torqued to Distance"...
Starting at the center bolts, retorque all ten bolts an additional 90 degrees.
Hope this helps, the graciousness of a FixYa rating would be greatly appreciated.
Posted on Jan 21, 2009
SOURCE: torque specs for toyota tercel
Hello vienotkelly: The correct Main bolt torque is 42 foot pounds. The connecting rods torque to 29 foot pounds. The torque sequence for the head bolts and the correct way to tighten the bolts are attached to this reply. Thak You for using FixYa. Roger
Posted on Apr 15, 2009
Main Bearing Cap Torque-42 Ft. Lbs.
Head Bolts Step 1-33 Ft. Lbs. Step 2- Additional 90 Degrees
Rod Bearing Nuts-29 Ft. Lbs.
Hope this helps
Posted on Sep 20, 2009
The 2002 2.4 engine head bolts are 'torqued to distance'.
First, install all the bolts, and, in a sequential fashion, starting at the innermost, working outward, torque all bolts to 70 N-m/806 kgf-cm/58 foot lbs.
Next, mark the front side of each head bolt with a dot of paint. Retighten te cylinder head bolts 90 degrees, starting at the inner 2, and working outward.
We hope that this helps you out.
Posted on Dec 29, 2009
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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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