EA81 head studs and torque settings.

Brumby Kid · Post by **Brumby Kid** » Sat Jul 14, 2012 11:02 pm

I have always thought that ea81's had 14 studs. 7 in each head. However after getting my engine back I found 9 threads in each head. I'm unaware whether these were heli coiled when the engine was being built or not.
Then I found a sheet that tells me in which order to torque the nuts. It says there are 9. How many are there ment to be? I had 4 across the top and 3 across the bottom when I took it out.
They are below and either side of the bottom middle stud.

Also I believe there are two holes for a small plug that fits half into the block and half into the head. Are there meant to be two plugs?

If anyone has any torque settings with degree measurements laying around I would love them. For all of the engine.

Cheers Cam

Post by **TOONGA** » Sat Jul 14, 2012 11:10 pm

you will find there are seven studs and two bolts for the rocker gear.

I have the 1983 fsm if you want it and the gregorys manual is here

TOONGA

Silverbullet · Post by **Silverbullet** » Sat Jul 14, 2012 11:34 pm

TOONGA wrote:you will find there are seven studs and two bolts for the rocker gear.

I have the 1983 fsm if you want it and the gregorys manual is here

TOONGA

This is the case, the two bolts for the rocker gear are part of the torque sequence. But as I found out at the wrong time you will need a special tool (jonno has the picture) or make your own out of a cheap socket for those two bolts. Because the head of the bolt is half under the rocker shaft you can't get a normal socket over it. I got a cheap 17mm socket and ground a big step in it leaving the a complete ring at the bottom for the bolt head and the big hole gave me just enough movement to give the bolt about 1/50th of a turn before I had to reposition it

Silverbullet · Post by **Silverbullet** » Sat Jul 14, 2012 11:48 pm

Torque for crankcase nuts and bolts:

M10(x6): 39-47Nm/ 29-35ft-lb
M8(x2): 26-26Nm/ 17-20ft-lb
M6(x2): 4.4-5.4Nm/ 3.3-4Ft-lb

Torque for Crankcase plugs:
62-76Nm/ 46-56ft-lb

Torque for oil strainer stay:
23-26Nm/ 17-20ft-lb

Torque for cylinder heads

1st step: 29Nm/22ft-lb
2nd step: 59Nm/43ft-lb
3rd step(final): 64Nm/47ft-lb

Torque for flywheel housing:
20-27Nm/ 14-20ft-lb

Torque for oil pan bolts:
4.4-5,4Nm/ 3.3-4ft-lb

Torque for flywheel bolts:
49-53Nm/ 36-39ft-lb

Torque for clutch cover:
16Nm/ 12ft-lb

Torque for crankshaft pulley:
64-74Nm/ 47-54ft-lb

Torque for intake manifold bolts:
18-22Nm/ 13-16ft-lb

steptoe · Post by **steptoe** » Sun Jul 15, 2012 8:35 am

Those plugs you mentioned that has no answer yet are two dowels to help align head and it makes sense you have two per head, sometimes if one sticks in block the other might stick in head, then, you get left and right mixed up and find one in head mates against one in block.
My home made tool was for EA82. I used a bent spanner for EA81, resembles an open end ring spanner with the open end should be 17mm , but it was an imperial size

the end that is normally ring was actually square for 1/2" inch drive torque wrench. Factory bent into a U shape.
I'm still waiting for you to ask the torque rating for installing the studs into the block !

There is a cool tool packaged in Stanley brand stuff at a few auto parts joints called a stud remover..prety handy here

Brumby Kid · Post by **Brumby Kid** » Sun Jul 15, 2012 10:05 am

Thanks guys.
Yeah I have a cheap stud remover, it abbliterated the old ones.
We are doing them up carefully with that with gasket goo.
Has anyone got any pics of this magical tool and what it's used for? I thought you did the rocker cover bolts on outside the rocker cover.
Thanks Sam, do you have the degrees? Like 40nm turn 90deg and then 50nm?

Cheers Cam

Post by **TOONGA** » Sun Jul 15, 2012 10:34 am

Cam look at Sams thread here

it has all the information you need and the picture of the tool Steptoe has

P.S. lots of reading stops lots of rushing

TOONGA

Gannon · Post by **Gannon** » Sun Jul 15, 2012 11:34 am

Usually the headgasket comes with torquing instructions.

Sent from my new touchy phone thingy

steptoe · Post by **steptoe** » Sun Jul 15, 2012 1:12 pm

three steps only not the torque to yield degrees after torque - wait until you advance to EJ

Brumby Kid · Post by **Brumby Kid** » Sun Jul 15, 2012 1:28 pm

Sweet that's great, I don't have the tool for yielding degrees.
The head gasket did come with torque settings but I don't trust them.
I'm going to use the Subaru specs.

Cheers Cam

Silverbullet · Post by **Silverbullet** » Sun Jul 15, 2012 2:25 pm

Brumby Kid wrote: I thought you did the rocker cover bolts on outside the rocker cover.
Thanks Sam, do you have the degrees? Like 40nm turn 90deg and then 50nm?

Cheers Cam

Different bolts we're talking about. The big long ones that hold the rocker arm assembly onto the head are the 2 extra threaded holes in the block. Two little ones that hold the rocker cover on are unrelated. Dunno what degrees has to do with it, never heard of it before!

Jonno, cylinder head studs into block torque is:
34-44Nm/ 25-33ft-lb

My book literally has everything, even info specific to twin carb models

steptoe · Post by **steptoe** » Sun Jul 15, 2012 8:22 pm

torque to yield head bolts are usually single use due to being stretched on first use - guess that stretch holds. Instructions come with tight to so many nM or whatever, then tighten another so many degrees - EJ stuff i think