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Old 03-21-2006, 02:35 PM   #1
pilfflip
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Location: Salem, OR
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'02 Silver Legacy

Default head bolt torque specs

I'm getting ready to disassemble my engine for the head gaskted job.

I need to know where I can find the torque specs for the head bolts and it would be nice if i could get them for other fasteners on the egine as well. Does anyone know where I could get a spec sheet or download one?

...actually, a Chilton or Haynes should have that huh?


~Mike
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Old 03-21-2006, 04:03 PM   #2
Speedwagon
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Haynes has it. But it's not so much a spec, as a procedure/ritual.
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Old 03-21-2006, 04:10 PM   #3
wrx_driver_2002
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I can give you whatever torque specs you want. If you need anymore Just ask

Intake Manifold Bolts: 18 Ft Lbs
Crankshaft Bolt: 101 Ft Lbs
Camshaft Bolts: 61 Ft Lbs
Flywheel Bolts: 55 Ft Lbs
Timing Belt Idler Botls: 30 Ft Lbs
Timing Belt Tensioner (8mm Bolts): 18 ft lbs
Water Pump: 44 in lbs
Oil Pump: 44 in lbs
Cam Support or Rocker Shaft (8mm): 18 Ft Lbs



Loosen Headbolts in this order:

1 5 4
3 6 2

Tighten Headbolts in this order:

3 1 6
5 2 4

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. We use GM Thread Sealant.
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Old 03-21-2006, 10:55 PM   #4
ballitch
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why the difference in torque readings from inner bolts to outer bolts? and why torque them down to 51 ft. lbs. and then back off to only 11 ft. lbs.? seems a little light to me but how the hell should i know. also, i heard that suby head bolts are stretch bolts and should be replaced when doing HG's. but ive also heard that that info is B.S. and some people use head bolts 5 or 6 times and nothing happens. any info is appreciated.



~Josh~
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Old 03-22-2006, 12:22 AM   #5
wrx_driver_2002
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Quote:
Originally Posted by ballitch
why the difference in torque readings from inner bolts to outer bolts? and why torque them down to 51 ft. lbs. and then back off to only 11 ft. lbs.? seems a little light to me but how the hell should i know. also, i heard that suby head bolts are stretch bolts and should be replaced when doing HG's. but ive also heard that that info is B.S. and some people use head bolts 5 or 6 times and nothing happens. any info is appreciated.



~Josh~
I've never questioned Subaru's torque sequence. It does seem a little extensive and odd, but it's what the engineers found out worked best, plus it's always worked perfectly for me, so I've had no reason to deviate. When you torque subaru head bolts to the final torque specs, you're actually using angle torque (That's why you turn them all 90* once, and then 90* again after those low torque numbers) I would assume you are somewhere around 80 ft lbs on the center bolts and 70 ft lbs on the outer bolts by the time you're done with your angle torque steps. It would make sense to me that the angle torque compensates for the stretch of the bolt. I've only had to replace headbolts once, and that was because the person who put the engine together the last time didn't use any sealant on the threads of the bolts, and he didn't torque them down correctly so coolant got down into the threads and rusted the bolts.
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Old 03-22-2006, 01:32 AM   #6
ballitch
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good to know, thanx.

~Josh~
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