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Guest Message by DevFuse
 

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EA81 head torque


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8 replies to this topic

#1 hatchsub

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Posted 03 August 2010 - 07:29 AM

Just looked in my HTKYSA book. It gives the torque sequence of bolts including the rocker assembly bolts which i was a bit surprised about. But my main question is what is the final torque number for EA81 heads? My book was saying something in the 40s (47 ft pounds i think). Is that correct?

#2 Turbone

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Posted 03 August 2010 - 09:51 AM

Yup, 47ft-lbs.
It goes 22-43-47.

#3 hatchsub

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Posted 03 August 2010 - 05:36 PM

Should i add a few ft pounds to the final number since im using permatorques or just leave it at 47. I heard some on this board do that?

#4 Turbone

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Posted 03 August 2010 - 06:47 PM

Only if its hi comp or a turbo.
But I dont think going to 50lb would hurt.

#5 hatchsub

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Posted 03 August 2010 - 07:45 PM

Well guess i should have specified that one. It is going to be High compression. I got .030 shaved off the heads. Its going to be stock pistons and cam (for now). Im just throwing this motor together so that i have the subaru back until i have more time to actually fully build the motor i really want.

#6 Crazyeights

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Posted 03 August 2010 - 10:38 PM

I just finished mine (EA81). About .004" removed from both deck halves to clean and square the surface up, another .020" off of each head, NOS ea71 pistons, delta solid lifter torque cam grind. I used FP Permatorque HG's @ a final step of 51 lbs and it runs great, makes lots of power, and doesn't leak a drop. I run quite a bit of timing with an SPFI setup. Hardest part was nailing down an acceptable valve clearance for the delta cam. I would probably go Hydro, or all the way to EJ if I was doing it again.

#7 GeneralDisorder

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Posted 04 August 2010 - 01:24 AM

I always final torque my EA head gaskets to 55. I figure between the extra torque and the Fel-Pro's I don't need a retorque. Hasn't failed me yet.

GD

#8 ford'ssubaru's

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Posted 31 March 2013 - 08:51 AM

I have read the above posts.  We rebuilt my son's and seam to be leaking coolant around the head gasket externally after about 5000 miles.  Is this a retorquing issue?

 

Eric Ford



#9 JuhaKankkunen

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Posted 31 March 2013 - 04:13 PM

As someone says, the correct way to do it is 22-43-47 final.
The sequence starts with the center nut behind the valve rocker. There is a sequence of tightening.

After firsts 1000 miles you have to retigthen all nuts to 47.

Note that 6 mm bolts only needs 8.

It is recommendable to put oil to all threads.

This are specification using Subaru OEM head gasket.




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