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Noahs944

I'm wanting to install a head onto the block. New 12 point (cheesehead) bolts with integral washers & longer threaded portion are here.

Previously I read something in the Haynes manual about an initial torque, then running engine until warm & then retorquing.

-Is that really the deal? Sounds so messy.

Also, what is the torque value on these new head bolts?

motormouth · Joined: 28 Feb 2010 Posts: 123 Location: Canton

Depends on what head studs you're using. ARP says retrorquing isn't necessary. Factory says to retorque.

Noahs944 · Posted: Sun Feb 07, 2016 7:41 am Post subject:

Thanks. Using factory bolts not studs on an NA engine.

motormouth · Joined: 28 Feb 2010 Posts: 123 Location: Canton

For factory parts, I'd use factory specs; it can't really hurt to do a retorque.

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Depends on the headgasket used as well.

For factory parts, just go with the factory specs and tightening order.

Also for retorquing, pulling the valve cover shouldn't be messy, there shouldn't be a lot of oil in the head to cause a mess.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

Noahs944 · Posted: Sun Feb 07, 2016 1:22 pm Post subject:

Thank you. Just noticed that my Haynes manuals are '81 & 83... so I will use the '83 as the more "current" reference. Cheers mates

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Noahs944 · Posted: Mon Feb 08, 2016 3:03 am Post subject:

Thank you Rasta! Anyone got a bulletin like that for the NA?

BTW- I compared the length of the new bolt to the old bolt. Exact same length... doesn't appear to be stretched. So maybe the old bolts can be re-used...

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

NA and 931 head are the same casting and use the same gasket, same bolts, same block, etc., so the same torquing instructions apply. Haynes will have different values because it is doesn't have the latest info from the TSBs. Use the instructions above, they are correct. Be sure to observe that there are THREE stages to tightening the bolts; and also be sure to observe the step of retightening after 60 minutes BEFORE running the engine. This is critical for proper sealing of the gasket regardless of whether you are using OEM gasket, Cometic MLS, or copper gasket.
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erstwhile owner of just about every 924 variant ever made

Noahs944 · Posted: Mon Feb 08, 2016 8:15 am Post subject:

Dan and Rasta. A big thanks to both of you. I figured there was a new method to go with the new bolt. Glad to read they are re-usable also. I coated my with anti-cease to be safe.

jason c · Joined: 13 Jan 2014 Posts: 1018 Location: Nwi

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

Another question about head bolts...

I am making a "hybrid" between a 931 and 924, the head from the turbo and the block from the N/A.

I do have the old head bolts from the 931 and new bolts for the 924 N/A, and they are not the same, which should I use?

jason c · Joined: 13 Jan 2014 Posts: 1018 Location: Nwi