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Old 11-10-2022, 04:58 PM   #1
FastBlue
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Default Re-use head gasket after set lash

Hey guys, I have a quick question. I have a new built block and heads. I need to set my lash and buy proper buckets. My question is, since I have to tq the heads to the block to set my lash with a brand new head gasket, can I take the heads off after setting lash and reuse the head gasket?

I ask because ill have to set the lash in my basement and the long block will be too heavy to drag upstairs.

Also, should I use assembly lube to tq the cams in place, or I can set the lash dry?
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Old 11-11-2022, 08:58 AM   #2
rtv900
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most people will say not to re-use it since it gets compressed under assembly torque and it seals by doing that one time, won't really compress the same way the second time.

kind of a bummer but at least gaskets aren't that expensive in the scope of building a motor
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Old 11-11-2022, 08:58 AM   #3
rtv900
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most people will say not to re-use it since it gets compressed under assembly torque and it seals by doing that one time, won't really compress the same way the second time.

kind of a bummer but at least gaskets aren't that expensive in the scope of building a motor
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Old 11-11-2022, 09:40 AM   #4
benflynn
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Only use oem or better and Id reuse it. I have. Bolts too. But Id set my lash last once I had it together. The machine shop should dial in the installed height already, usually dosnt change that much unless u are changing something block related.
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Old 11-11-2022, 01:39 PM   #5
FastBlue
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Yes, OEM gasket will be used. Any other thoughts on this?
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Old 11-11-2022, 03:49 PM   #6
subydude
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Quote:
Originally Posted by FastBlue View Post
Yes, OEM gasket will be used. Any other thoughts on this?
I save the old gaskets that come off when taking an engine apart and reuse them any time I'm doing a test assembly. Then when I do final assembly I use fresh gaskets to know the seal is good.

I wouldn't suggest reusing a head gasket that has a crush ring if you're shooting for more than OEMish power.
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Old 11-22-2022, 08:12 PM   #7
monkeyposeur
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I recently ran into this same problem. I bolted my heads on to the short block but had to remove the heads to do some more work. I decided not to reuse them. I even asked a Subaru tech and he said for peace of mind he would use new ones as well.

That being said, according to the Factory Service Manual if during the initial torqueing procedure the bolt makes stick-slip sounds during tightening you can remove the bolts and head, oil the head bolt threads and re-use the gasket. So that seems like it is acceptable to reuse the gasket after it has been crushed. However, I was too paranoid to re-use it. It sucks to be out another $120 for the build, but it helps me sleep at night.

I found a thread or two where people have torqued the head down, removed the head, and re-used the gasket with no problems. So it's your call.

Here is the exact instructions from the FSM for the 2006 Outback XT which is the same engine as the 2006 STi (Page ME(H4SO)-54):
INSTALLATION
1) Install the cylinder head to the cylinder block.
CAUTION:
Be careful not to scratch the mating surface of
cylinder head and cylinder block.
NOTE:
Use a new cylinder head gasket.
(1) Clean the bolt threads and the bolt holes in
the cylinder block.
CAUTION:
To avoid erroneous tightening of the bolts,
clean out the bolt holes sufficiently by blowing
with compressed air to eliminate engine coolant etc.
(2) Apply a sufficient coat of engine oil to the
washer and bolt thread.
(3) Tighten all bolts to 40 Nm (4.1 kgf-m, 29.5
ft-lb) in alphabetical order.
(4) Retighten all bolts to 95 Nm (9.7 kgf-m,
70.1 ft-lb) in alphabetical order.
CAUTION:
If the bolt makes stick-slip sound during tightening, repeat the procedure from step (1). In this case, the cylinder head gasket can be reused.
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Old 02-11-2024, 08:14 PM   #8
Elijohn12
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But can they be re-used if you go threw the rest of the steps where you tighten them 90 45 and then a and b another 45? I feel like once you get that far it's too late for that gasket but I could very well be wrong.
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Old 02-12-2024, 10:54 AM   #9
cboggess
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Think of it like this.

You COULD reuse them, and it MIGHT be ok, but if they are not then that's an awful lot of work to replace a part that a) isn't much money, b) is literally right there right now, and c) already has you self doubting your assembly.
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Old 02-17-2024, 04:38 PM   #10
hani
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They get crushed in the torquing procedure and then you loosen the bolts only to retighten them again. You can use them just fine if you haven not run the engine. i have done it plenty of times
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Old 02-19-2024, 10:54 AM   #11
subydude
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I have a spare set of head gaskets that I kept off another engine that I use for lash. They go in, I set lash, they come out, and the fresh new ones from the kit go in and torqued to final.
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