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the_mad_electrician
Joined: 16 Nov 2009
Posts: 1073
Location: Central Georgia
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 Posted: Wed Feb 24, 2010 11:28 am Post subject: Stupid question! |
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This is probably the most stupid question ever asked, but What size Allen wrench fits the 924 head bolts? I stripped everything off a head I wanted to get out of the pull-a-part and found Allen heads and I don't own any Metric Allens so I need to know what size to buy.
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81 924 N/A
2004 Ranger "Edge"
2005 Mazda 6 |
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Rocco R16V
Joined: 03 May 2009
Posts: 497
Location: PNW
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| Posted: Wed Feb 24, 2010 11:43 am Post subject: |
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there are a couple sizes of metric allens used on these cars, you should just buy a set.
I bought some craftsman allen sockets, these are much better than the cheap L keys, i use 'em more than you'd think.
i think the most common are 6 and 8, but i dont know about the head bolts sorry.
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"Government exists to protect us from each other. Where government has gone beyond its limits is in deciding to protect us from ourselves. "
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the_mad_electrician
Joined: 16 Nov 2009
Posts: 1073
Location: Central Georgia
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| Posted: Wed Feb 24, 2010 11:46 am Post subject: |
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thanks man I'll just get a set I probably need them anyway, and as deep as the bolt are I doubt the L keys would reach!
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81 924 N/A
2004 Ranger "Edge"
2005 Mazda 6 |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Wed Feb 24, 2010 1:10 pm Post subject: |
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I believe they are a size M10...I would second the suggestion to buy a complete set from Craftsman, as you're going to need them.
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erstwhile owner of just about every 924 variant ever made |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Wed Feb 24, 2010 1:14 pm Post subject: |
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Just confirmed, they are an M10 hex (Type 2). However, there were apparently some that were M10 triple square (12-point internal, aka Type 3). I have a special Porsche tool for those, so if you find out that they have the Type 3, I would consider letting you borrow the triple square that I have, since it's a pretty uncommon piece and not easy to find.
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erstwhile owner of just about every 924 variant ever made |
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Wed Feb 24, 2010 1:21 pm Post subject: |
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| the_mad_electrician wrote: | | thanks man I'll just get a set I probably need them anyway, and as deep as the bolt are I doubt the L keys would reach! |
Uh, how would you use a torque wrench with a L key?
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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Rocco R16V
Joined: 03 May 2009
Posts: 497
Location: PNW
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| Posted: Wed Feb 24, 2010 2:24 pm Post subject: |
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you can now find a three piece set of triple squares at harbor frieght.
these are also good to have in the tool box.
I know some vw axle bolts use these, do the porsche use triple square or regular allen head bolts on the axles?
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"Government exists to protect us from each other. Where government has gone beyond its limits is in deciding to protect us from ourselves. "
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!tom
Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada
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| Posted: Wed Feb 24, 2010 2:59 pm Post subject: |
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Triple square for the CV joints from the factory; many replace them with allens after stripping the triple square with the incorrect tool.
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78 924 NA
5-lug |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Thu Feb 25, 2010 1:53 am Post subject: |
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BTW, get a 1/2" drive unit for the head bolts. I broke three 3/8" versions taking the head off my car.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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brupska
Joined: 27 Aug 2009
Posts: 150
Location: Indiana
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| Posted: Thu Feb 25, 2010 7:28 am Post subject: |
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| I just torqued mine down with a Torx head T50 or T45??? I used a socket driver. I can't remember which one it was!! I have a 81 924 NA if that helps!!! |
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9XX Girl!
Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England
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| Posted: Thu Feb 25, 2010 8:54 am Post subject: |
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| !tom wrote: | | Triple square for the CV joints from the factory; many replace them with allens after stripping the triple square with the incorrect tool. |
Out of the 24 Try-square machine screws on the CV flanges on my car, only one has been replaced with a socket head machine screw. Can't remember where but i did read that socket screws can fail as they have six points of weakness due to a large socket hole compared to screw head size.
The reason for the use of Try-square machine screws is the heads are stronger in both relation to socket head (allen) and Torx as the socket hole is smaller compared to the screw head, resulting in a stronger head and more distributed focused points of weakness.
However, my odd socket screw is still OK spinning around on my O/S half shaft. It can be easily removed with the correct Tri-square bit (which is M8 Tri-square for CV joints screws).
oh... a 7mm hex key and a 22mm swan neck ring spanner are handy too for removing the top bracket of the MacFer struts.
But... i do prefer a "L" shaped key for the pinch nut on the front stub axials.  Always worth carrying one in your tool roll.
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY |
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haroldk
Joined: 24 Nov 2008
Posts: 171
Location: St Paul, MN, USA
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| Posted: Thu Feb 25, 2010 9:10 am Post subject: |
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| 9XX Girl! wrote: |
The reason for the use of Try-square machine screws is the heads are stronger in both relation to socket head (allen) and Torx as the socket hole is smaller compared to the screw head, resulting in a stronger head and more distributed focused points of weakness.
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Well, the Ford Sierras (including the Cosworth RS and RS500) all used Torx screws in all 4 CV joints. They make more power than a 924 (even in factory detune) and I know some people here in the states using the factory CV joints on Merkur XR4Tis and running close to 500hp through them with allen-head screws without a failure.
That's all anecdotal, but I really doubt an allen-head screw is more failure-prone in that application than a tri-square. |
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9XX Girl!
Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England
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| Posted: Thu Feb 25, 2010 9:24 am Post subject: |
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| haroldk wrote: |
Well, the Ford Sierras (including the Cosworth RS and RS500) all used Torx screws in all 4 CV joints. |
hmmm... i was kind of skeptical when i read it plus, givin it a mention was sure to prompt a response.  Some old Rovers use common old bolts. Wonder why Porsche and VW and Audi go for Try-Sq then?
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY |
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the_mad_electrician
Joined: 16 Nov 2009
Posts: 1073
Location: Central Georgia
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| Posted: Thu Feb 25, 2010 11:06 am Post subject: |
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| Paul wrote: | | the_mad_electrician wrote: | | thanks man I'll just get a set I probably need them anyway, and as deep as the bolt are I doubt the L keys would reach! |
Uh, how would you use a torque wrench with a L key? |
I don't plan on torqueing them I'm trying to get them off. I'll be going back with head studs when I reinstall the head.
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81 924 N/A
2004 Ranger "Edge"
2005 Mazda 6 |
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Thu Feb 25, 2010 11:14 am Post subject: |
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Well done.
Just cut off a cheap 10 mm L key and use a socket.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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924 FAQ (Technical)
