TTY after HG
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Senior User
Joined: Nov 2015
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From: 7500’ Colorado
TTY after HG
My truck 2006 F-250 (before I had it), had oil cooler, EGR cooler, HG's all replaced by Ford back in 2012.
When they did the HG would they have used TTY head bolts since it's a 6.0, or would they have used the M14 since it was done in 2012?
How could I tell the difference?
When they did the HG would they have used TTY head bolts since it's a 6.0, or would they have used the M14 since it was done in 2012?
How could I tell the difference?
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
I think the 6.4 used a M16.
Were you told that if the dealer replaced the TTY's they used a larger bolt?
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Senior User
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From: 7500’ Colorado
no I was not told that. I’m just curious
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Laughing Gas
Joined: Oct 2013
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To maybe clear this up, the threads into the block of a 6.0 are M14. This is the metric equivalent (14 mm) of approximately 9/16". All the bolts and studs that hold heads onto 6.0 blocks are M14 thread, to go into the block. The stock Torque-To-Yield bolts are weaker than studs like ARP, and TTY bolts are not reusable. That said, TTY bolts last plenty long for many people, and lots of cars use them, not just this engine.
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Thread Starter
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Senior User
Joined: Nov 2015
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From: 7500’ Colorado
To maybe clear this up, the threads into the block of a 6.0 are M14. This is the metric equivalent (14 mm) of approximately 9/16". All the bolts and studs that hold heads onto 6.0 blocks are M14 thread, to go into the block. The stock Torque-To-Yield bolts are weaker than studs like ARP, and TTY bolts are not reusable. That said, TTY bolts last plenty long for many people, and lots of cars use them, not just this engine.
I'm gonna put studs in soon. I suspect it's a job I don't wanna tackle on my own. Probably pay someone to do it.
Hotshot
Joined: Dec 2014
Posts: 17,826
Likes: 3,110
From: Jersey Shore
M14 only refers that it’s a Metric bolt, 14mm in diameter. There are different threads per mm, which effect strength, as well as all types of grades of steel and heat treatment that alters strength (clamping load).
Light duty read
https://en.m.wikipedia.org/wiki/Bolt_(fastener)
Heavy duty read
https://www.fastenal.com/content/doc...renceGuide.pdf
Light duty read
https://en.m.wikipedia.org/wiki/Bolt_(fastener)
Heavy duty read
https://www.fastenal.com/content/doc...renceGuide.pdf
Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
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From: 'Pitlock, Maine
For what it's worth I read somewhere (on FTE I think, but if not, one one of the other sites I read occasionally) that TTY bolts got a worse than deserved rap because of an auto torquing device used at the International plant when they produced these engines being out of calibration so the bolts weren't being torqued to spec. Supposedly this was discovered sometime in early 05 and corrected. They still are a weaker clamping devise than ARP studs, but not as bad as first believed. It must be true, I saw it on the internet. lol
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Senior User
Joined: Nov 2015
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From: 7500’ Colorado
For what it's worth I read somewhere (on FTE I think, but if not, one one of the other sites I read occasionally) that TTY bolts got a worse than deserved rap because of an auto torquing device used at the International plant when they produced these engines being out of calibration so the bolts weren't being torqued to spec. Supposedly this was discovered sometime in early 05 and corrected. They still are a weaker clamping devise than ARP studs, but not as bad as first believed. It must be true, I saw it on the internet. lol
I have no problems with mine - yet. They were replaced by ford when the EGR failed, but to my knowledge the gaskets never failed.
Hotshot
Joined: Dec 2014
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From: Jersey Shore
They were ISO 9001 as we were, so maybe a run between calibrations could have been out, but not years. Then those that were out would have had to been pulled back and certified acceptable after testing. I could see them altering the composition of the bolt so the torque could be increased, if somehow that could have been misconstrued.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
They were ISO 9001 as we were, so maybe a run between calibrations could have been out, but not years. Then those that were out would have had to been pulled back and certified acceptable after testing. I could see them altering the composition of the bolt so the torque could be increased, if somehow that could have been misconstrued.
, but before a new rumor got going ......