[AT] Torque for bolts vrs studs in cylinder heads?--followup

RonMyers at wildblue.net RonMyers at wildblue.net
Sun Apr 29 15:53:04 PDT 2007


Try tonguing the head bolts on Diesel in a small Tug Boat. 650 lb. and no
space to work with.
Also the bolts that hold the winch on the Cat D-7 is 650 lbs. more room to
work with.
Ron
----------------------------------------------
> Larry I've never actually torqued one of those torque to yield head bolts
> myself so I don't know the mechanics of it.
>
> Speaking of working up a sweat with a torque wrench.  Have you ever been
> around anyone rebuilding a big Cummins diesel like the one's in over the
> road trucks?   It's been over 20 years since I was around one being
> rebuilt
> but if I remember right the head bolts torque to something like 350
> ft/lbs.
> It takes a BIG torque wrench and a big man (or men) pulling on it.
>
> Charlie
>
> ----- Original Message -----
> From: "Larry D Goss" <rlgoss at evansville.net>
> To: "Antique tractor email discussion group"
> <at at lists.antique-tractor.com>
> Sent: Saturday, April 28, 2007 4:27 PM
> Subject: Re: [AT] Torque for bolts vrs studs in cylinder heads?--followup
>
>
>> If I remember correctly, the instructions for one of those engines reads
>> something like: Torque to XX ft-lbs and then turn the bolt 180 degrees
>> more.
>> It's the only type of engine that ever caused me to work up a sweat
>> while
>> torquing head bolts even while working outside on a cold day.
>>
>> Larry
>>
>> ----- Original Message -----
>> From: "charlie hill" <chill8 at suddenlink.net>
>> To: "Antique tractor email discussion group"
>> <at at lists.antique-tractor.com>
>> Sent: Saturday, April 28, 2007 12:32 PM
>> Subject: Re: [AT] Torque for bolts vrs studs in cylinder
>> heads?--followup
>>
>>
>>> John,  some of the new light weight auto engines use head bolts that
>>> are
>>> "torque to yield"  which means they are tightened to where they are
>>> just
>>> at
>>> the point of failure.   When you remove the heads on those engines you
>>> MUST
>>> replace the head bolts.  Those first GM diesel car engines (the 5.7
>>> built
>>> from a gasoline block) were that way.
>>>
>>> In other words they used the smallest, lightest head bolts they could
>>> get
>>> by
>>> with and they won't stand up to being re-used.
>>>
>>> Charlie
>>>
>>>
>>> ----- Original Message -----
>>> From: "John Wilkens" <jwilkens at eoni.com>
>>> To: "Antique tractor email discussion group"
>>> <at at lists.antique-tractor.com>
>>> Sent: Saturday, April 28, 2007 1:22 PM
>>> Subject: Re: [AT] Torque for bolts vrs studs in cylinder
>>> heads?--followup
>>>
>>>
>>>> Many thanks guys for educating me about head bolts!   To be sure,
>>>> I'll stick with studs!    John W.
>>>>
>>>>
>>>>
>>>> At 08:08 PM 04/27/2007, you wrote:
>>>>>
>>>>>John, There are a whole bunch of GOOD reasons to stay with all of the
>>>>>OEM
>>>>>parts and torque specs on head bolts! You may get away with some
>>>>>non-OEM parts
>>>>>sometimes but it is like gambling with your engine's life span.
>>>>> Granted
>>>>>it
>>>>>varies from engine to engine, usually older engines have more room
>>>>>to play with
>>>>>and more modern engines have tighter specs with almost no room for
>>>>>error.
>>>>>Some  head bolts are TTY and can only be used once. The headgasket
>>>>>thickness also
>>>>>  matters on some engines especially if you have had the head
>>>>> resurfaced.
>>>>>Sometimes the OEM manual will give 2 torque specs with the head bolt
>>>>>dry or oil
>>>>>on threads. Studs or bolts of the same grade should be the same spec I
>>>>>think.
>>>>>If  you lower the grade of bolt you may be asking for problems. Just
>>>>> my
>>>>>2
>>>>>cents.  Willard Smith, Tacoma, WA.
>>>>>
>>>>>About how much more torque would be required for using bolts in an
>>>>>engine head vrs. the regular studs?  (One for the  experts!)   John W.
>>>>>
>>>>>In the wide-open spaces of NE  Oregon
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>************************************** See what's free at
>>>>>http://www.aol.com.
>>>>>
>>>>>_______________________________________________
>>>>>AT mailing list
>>>>>http://www.antique-tractor.com/mailman/listinfo/at
>>>>
>>>>
>>>>                    In the wide-open spaces of NE Oregon
>>>>
>>>>
>>>>
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