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Todd30 New User
Joined: 08 Jul 2014 Posts: 3
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Posted: Tue Jul 08, 2014 8:39 pm Post subject: TO30 Cylinder head studs |
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Hello All, I am rebuilding a z129 engine and I keep stripping the head studs when I try to torque the nuts down (only 75 ft lbs). I found only one place that sells new ones but they"re $9 a piece. Has anyone had any luck using bolts? If so what lengths did you use? Thanks. |
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mathman New User
Joined: 20 May 2013 Posts: 17 Location: AR
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Posted: Tue Jul 08, 2014 9:55 pm Post subject: Re: TO30 Cylinder head studs |
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Where did you find the studs? |
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Richard L Tractor Guru
Joined: 04 Nov 2007 Posts: 3925
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Posted: Wed Jul 09, 2014 3:45 am Post subject: Re: TO30 Cylinder head studs |
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Any auto parts store should have them. |
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DrLoch Regular
Joined: 18 Jan 2014 Posts: 213
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Posted: Wed Jul 09, 2014 5:13 am Post subject: Re: TO30 Cylinder head studs |
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Thats odd, I've never stripped the threads off a stud or out of the nut and I've built a number of different motors. Are these the factory studs or have you replaced them with something else? Are you using any sort of assembly lube on the studs? If not you should be regardless of what the manual says.
When torqueing something down, there are quite a few forces involved. There is a resistive force from the friction between the surface of the bolt or stud and the object it is in contact with (block, head, cover, etc). There is, also, a resistive force coming from the stud itself as it is literally stretched (the primarly cause of the preload). There is a resistive force between the stud threads and the nut being rotated.
If everything is dry, the friction forces can be quite high. These forces effect the amount of force being put on the stud. This can and often does result in an improper preload on the bolt.
There are two different lengths used, 1 7/8″ which is part number 353964X1 and 4 11/16″ which is part number 1035877M1. They are certainly pricie..... I would try using an ARP stud and nut, they will sell individual studs and nuts if you know the thread and pitch.
Last edited by DrLoch on Wed Jul 09, 2014 5:24 am; edited 1 time in total |
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Don Hooks Regular
Joined: 10 Oct 2007 Posts: 135 Location: alabama
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Posted: Wed Jul 09, 2014 7:01 am Post subject: Re: TO30 Cylinder head studs |
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Just a note on a similar experience: I was rebuilding some piece of equipment and the studs were good but I had beat up the nuts taking them off. I decided to replace them with the same grade nut from the hardware store and the same thing happened - they stripped! Turns out the new nuts were just a little larger than the originals. A case of USA studs and far eastern nuts. |
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Todd30 New User
Joined: 08 Jul 2014 Posts: 3
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Posted: Wed Jul 09, 2014 7:25 am Post subject: Re: TO30 Cylinder head studs |
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Thanks all for the quick replies. I believe these studs are original. Can you think of a downside to using regular bolts?
Dr. Loch - what is an ARP?
Mathman - Jacks Small Engines has the new ones. |
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DrLoch Regular
Joined: 18 Jan 2014 Posts: 213
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Posted: Wed Jul 09, 2014 3:42 pm Post subject: Re: TO30 Cylinder head studs |
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I would use studs. When I rebuild my 23C this winter I'm going to replace the head bolts/studs with all ARP studs. Same with the rod bolts.
http://arp-bolts.com/ American Racing Products. Once you find the length and pitch you can call them to get a match. I've used there products for years in racing engines, wouldn't use anything else. Did you see the price for them @ Jack's? ARP's aren't necessarily cheap either, but you get what you pay for. They will also have the hardened nuts and washers to go with the studs. |
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Steve@Advance Tractor Guru
Joined: 12 Nov 2013 Posts: 9702
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Posted: Wed Jul 09, 2014 7:07 pm Post subject: Re: TO30 Cylinder head studs |
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I would not use regular bolts. Couple of problems, bolts don't give the full thread depth engagement that a stud does, and a stud with a fine thread nut pulls harder than a coarse thread bolt.
Most everyone knows to run a tap in the bolt holes when going back together with an engine, which is the proper thing to do. Some assume the same is true with a stud, to run a die over the threads, especially if they're rusty. Not true! Never run a die over a bolt or stud, it will under size it. The threads are rolled on prior to heat treating. Not saying you did this, but if you did... |
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Jason S. Tractor Expert
Joined: 07 Dec 2011 Posts: 2820
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Posted: Thu Jul 10, 2014 5:19 am Post subject: Re: TO30 Cylinder head studs |
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Todd30 wrote: | (quoted from post at 05:39:55 07/09/14) Hello All, I am rebuilding a z129 engine and I keep stripping the head studs when I try to torque the nuts down (only 75 ft lbs). I found only one place that sells new ones but they"re $9 a piece. Has anyone had any luck using bolts? If so what lengths did you use? Thanks. |
Did you install new nuts on the old studs when you put it together? I was asking because there are different classes of tolerance fitment for nuts and bolts. Of course using the looser tolerance nuts will be more prone to stripping the studs. If you went to bolts instead of studs you would probably blow head gaskets. Bolts can not torque as evenly as studs. Basically as you torque a nut on a stud the only force against it is pulling upwards. If you torque a bolt you have two forces working against it,pulling upwards and twisting of the bolt. Did you add hardened washers under the nuts? |
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Todd30 New User
Joined: 08 Jul 2014 Posts: 3
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Posted: Mon Jul 14, 2014 9:28 am Post subject: Re: TO30 Cylinder head studs |
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Thanks all for your advice. I decided to bite the bullet and buy all new studs. |
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