Farm Equipment - 262 DIESEL WITH ARP HEAD STUDS

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262 DIESEL WITH ARP HEAD STUDS

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=24771
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Topic: 262 DIESEL WITH ARP HEAD STUDS

Posted By: Brian Jasper co. Ia
Subject: 262 DIESEL WITH ARP HEAD STUDS
Date Posted: 27 Jan 2011 at 12:21pm

I was looking around ARP's web site and also saw the demo on Power Block TV about clamping force and the effect various lubes have along with tightening, loosening, and retightening to get even clamping force. I called their tech line and they state using their "Ultra Lube" they advise 100 ftlbs and state that the actual clamping force would be equal to 140 ftlbs using motor oil for lube.

For some interesting reading on fasteners and metallurgy, check out their web site and read up on the technical info.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Replies:

Posted By: Coke-in-MN
Date Posted: 27 Jan 2011 at 12:39pm

So do you have to reset all the torque reading you use then,seems If 100 = 140 if you say torqued to 140 you might break or stretch stud or bolt beyond the limit it is meant to retain it's strength or elasticity.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: Brian Jasper co. Ia
Date Posted: 27 Jan 2011 at 1:04pm

ARP's fasteners are better quality the the originals. Talking to the tech line guy, the lubricant used greatly affects clamping force. Reading on their tech site, a stretch gauge is the most accurate way to tighten a bolt. On a head, obviously you can't do it that way. Remember that torque is a turning force. If too much of that turning force is used up by friction, your clamping force is reduced. Reduced clamping force less strain on the fastener. Now if you use a lubricant, more strain is placed on the fastener because the friction resisting the turning of the fastener is reduced. More turning all things being equal puts more strain on the fastener. More strain equals more clamping force.

That's one of the reasons for late model engines using torque to yield process. Pre loading the bolt, then turning a specific number of degrees to the point it stretches makes it easier to obtain a desired clamping force.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: Boshears Carb & Mag
Date Posted: 27 Jan 2011 at 1:11pm

I have used ARP studs on my tractors. One nice thing is that the nut being tightened is a fine thread so it does take less torque to achieve the same clamping force. I also know that those studs are probably better grade material than the factory studs and they haven't been stretched or weakened by previous head gasket changes. They are good people to deal with.