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Re: mitsubishi evo6 headbolts
Hi there, make sure you measure your bolts measure 96.4mm for a 4G93 engine.
Then you must tighten 35Nm-75Nm- slacken completely- 20Nm- 90degrees-90degrees.
No retightening of the head bolts is required as these bolts are tightened in the plastic zone.
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Thread Head bolt torque and sequence
Read the threads, but it states:
According to my manual the removal and the replacement sequence are different. Removal (looking from the cam sprockets )
headbolt 1-3-9-5-7 are on the left and 2-4-10-9-8 are on the right. Remove in that progression.
Instillation 9-5-1-3-7 are on the left and 10-6-2-4-8 are on the right tighten in that order.
Tighten to 25Nm or 18 ft/lb. and retighten the cyl hd blt 70 deg plus 70 deg plus 50 deg using the angular torque guage KM-470-B.
Hope this helps. Might help to make a sketch and label the 5 headbolts on each side.
Following the tightening order, torque Head Bolts as following:
1. Torque All to 22 Ft Lbs 2. Torque all to 51 Ft Lbs 3. Loosen all 180 degrees 4. Loosen all 180 degrees 5. Torque Center Two bolts to 25 Ft Lbs 6. Torque Outer 4 bolts to 11 Ft Lbs 7. Tighten all bolts 90 degrees 8. Tighten all bolts 90 degrees again
Make sure you tighten all of them down the first 90* and then go back and tighten them another 90*. Also make sure you put some lube between the bolt and the washer, and put some sealant on the bolt threads. Use GM Thread Sealant.
Torque all headbolts to 29 ft lbs with a good and accurate torque wrench, then tighten them further in two steps 90 Degrees per step. But if you've replaced the head bolts with new ones tighten them and additional 90 Degrees.
Hope this helps, from autozone site. Curt Application:
Cylinder head bolt torque sequence
front | 3 1 6 |
of | |
vehicle | 5 2 4 |
Step 1: Lightly oil cylinder bolt threads & washers
Step 2: Torque to 22 Ft/Lbs
Step 3: Torque to 51 Ft/Lbs
Step 4: Loosen all bolts 180 degrees
Step 5: Loosen all bolts 180 degrees
Step 6: Torque bolts 1 & 2 to 25 Ft/Lbs
Step 7: Torque bolts 3, 4, 5, 6 to 11 Ft/Lbs
Step 8: Turn all bolts an additional 80 to 90 degrees
Step 9: Turn all bolts an additional 80 to 90 degrees
*** 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.
There should be 10 headbolts. This vehicle uses torque to yield headbolts and should be replaced with the new gasket. Bolts 1-8 get torqued to 40 ft lbs initially, bolts 9 and 10 get torqued to 30 ft lbs initially, Then all bolts get turned an additional 90 degrees. I would strongly suggest borrowing a torque angle gauge for doing this or you might be doing the same repair next week.
the 4th bolt back from the front on pasenger side is the #1 head bolt, tighten in a clockwise rotation. it is a 4 step process.torque all bolts to 22 ft lbs...step 2 torque all to 45 ft lbs...step 3 retorque all to 45 ft lbs...4th step torque bolts 1 through 10 to 110 ft lbs... bolt 11 to 100ft lbs then bolts 12 thru 14 at 110 ft lbs