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03-21-2006, 02:35 PM | #1 |
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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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03-21-2006, 04:03 PM | #2 |
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Haynes has it. But it's not so much a spec, as a procedure/ritual.
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03-21-2006, 04:10 PM | #3 |
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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. |
03-21-2006, 10:55 PM | #4 |
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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~ |
03-22-2006, 12:22 AM | #5 | |
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Quote:
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03-22-2006, 01:32 AM | #6 |
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good to know, thanx.
~Josh~ |
12-27-2014, 10:27 AM | #7 |
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No sealant is needed on the head bolts. The Subaru manual says to use engine oil to lube the bolt. Always lube the whole bolt, including the threads and both sides of the washer. Heavier oil works best. The only way coolant can get to the bolts is if the head gasket is already failing. The initial torquing of the head bolts is to compress the head gasket. This insures that the final torque sequence is accurate and not just compressing the gasket. If the bolts creak and pop while torquing, you need more lube on the bolt. If you are at the beginning of the torque sequence when the bolt creaks, start over from the beginning after relubing the bolt. If the bolt creaks after you have started the final torque procedure (25 lbs-ft on the center bolts, 11 lbs-ft on the outer) restart the procedure at the point where you loosen all bolts 180 degrees and all bolts again 180 degrees. In case of a stubborn creaking bolt, a bit of anti-seize usually does the trick. Also, make sure the bolt holes are super clean before beginning. Brake clean and compressed air work best. If you don't have compressed air, allow plenty of drying time after brake-cleaning the holes.
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12-27-2014, 10:48 AM | #8 |
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Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Hopefully the OP hasn't been waiting for almost 8 years until someone provided that information.
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12-30-2014, 09:13 AM | #9 | |
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Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
Quote:
Do the NA guys still use the FI torque specs for the HG's? It's what I started doing a long time ago once the "new" (back then) HG's came out. |
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01-26-2016, 09:41 PM | #10 |
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I learned a valuable lesson about inch pounds
Inch pounds VS foot pounds. Be warned future folk, pay attention to the spec measurment unit lol |
01-27-2016, 08:38 PM | #11 |
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08-21-2020, 05:13 PM | #12 |
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Still doing it in 2020
I've browsed a few threads on head bolt specs and they all seem similar. Some say 14ft. Pounds on the outside bolts some say 11. I do 14 myself. I imagine they might snap or really stretch if over torqued when the head expands. Tried the copper gasket spray too once, I don't trust it, had to swap heads for avcs heads and when I took it apart it was still not cured weeks later. Maybe in a tight situation I would try it again but I'd let it cure completely dry first. Gaskets didn't fail in that 1 month period though but I think they may have eventually.
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01-16-2021, 08:38 AM | #13 | |
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