stainless exhaust manifold bolts ? - Ford Truck Enthusiasts Forums



1999 - 2003 7.3L Power Stroke Diesel SPONSORED BY:

stainless exhaust manifold bolts ?

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-13-2012, 08:41 AM
vronp vronp is offline
Freshman User
Thread Starter
 
Join Date: Jul 2009
Posts: 42
vronp is gaining momentum as a positive member of FTE.
stainless exhaust manifold bolts ?

Hi all,

I am replacing my two exhaust manifolds (2002 Ex) and was wondering if stainless steel bolts is a good idea.

If so, does anybody have any source or specification for a stainless bolt?

Thanks very much and happy holidays !!

Dave
Reply With Quote
  #2  
Old 12-13-2012, 09:03 AM
trekbasso trekbasso is offline
Posting Guru
 
Join Date: Dec 2010
Location: Wellington, Co
Posts: 1,465
trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.
Scribing. You would think as much as Ford charges for new ones they were gold. I like the idea, but for some reason thinking there is some stretch properties involved.
I am sure someone better quailified will chime in soon.
Reply With Quote
  #3  
Old 12-13-2012, 09:25 AM
Snowseeker's Avatar
Snowseeker Snowseeker is online now
Post Fiend
 
Join Date: May 2005
Location: Stevens Point, WI
Posts: 12,358
Snowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputation
Stainless can and is used all the time. Stainless does gall and is brittle and will break if to much torque is applied.

Reply With Quote
  #4  
Old 12-14-2012, 01:10 AM
crop harvester crop harvester is offline
Posting Guru
 
Join Date: Jul 2011
Posts: 1,345
crop harvester has a very good reputation on FTE.crop harvester has a very good reputation on FTE.crop harvester has a very good reputation on FTE.
I had bad experiences with s.s. bolts. ive learned to use only when absolutely have to. due to the galding effect you wont get the clamping force needed,and they can be a pain to drill out when broke off in castings.
Reply With Quote
  #5  
Old 12-14-2012, 05:54 AM
UNTAMND's Avatar
UNTAMND UNTAMND is offline
Postmaster
 
Join Date: Jul 2009
Location: Lansdale, PA
Posts: 3,449
UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.
You're using the wrong stainless bolts for the application if you keep breaking them.
Most all stainless bolts you get at the hardware store and even parts stores are "grade 3" or "household" bolts. They are NOT ment to be used for important stuff.
You CAN buy good stainless bolts from ARP and sometimes places like fastenall and grainger probably.
Problem with stainless is the expansion rate vs regular hardened steel. The more carbon the less expansion. Meaning you'll lose clamping force with stainless bolts more than hardened steel bolts from the 1000* heat of your manifolds.

I'd stick with the correct bolts or studs. It's not like you're taking the manifolds on and off 2-3 times a year and need the ease of removal.
Reply With Quote
  #6  
Old 12-15-2012, 09:59 AM
Snowseeker's Avatar
Snowseeker Snowseeker is online now
Post Fiend
 
Join Date: May 2005
Location: Stevens Point, WI
Posts: 12,358
Snowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputation
Quote:
Originally Posted by crop harvester View Post
I had bad experiences with s.s. bolts. ive learned to use only when absolutely have to. due to the galding effect you wont get the clamping force needed,and they can be a pain to drill out when broke off in castings.

If you get ss bolts for an application that you'll be removing and reinstalling the bolts more than a few times I have found that running a die over the bolts when new and lubing them with moly lube stops them from galling.
Reply With Quote
  #7  
Old 12-15-2012, 10:02 AM
Snowseeker's Avatar
Snowseeker Snowseeker is online now
Post Fiend
 
Join Date: May 2005
Location: Stevens Point, WI
Posts: 12,358
Snowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputationSnowseeker has a superb reputation
Quote:
Originally Posted by UNTAMND View Post
You're using the wrong stainless bolts for the application if you keep breaking them.
Most all stainless bolts you get at the hardware store and even parts stores are "grade 3" or "household" bolts. They are NOT ment to be used for important stuff.
You CAN buy good stainless bolts from ARP and sometimes places like fastenall and grainger probably.
Problem with stainless is the expansion rate vs regular hardened steel. The more carbon the less expansion. Meaning you'll lose clamping force with stainless bolts more than hardened steel bolts from the 1000* heat of your manifolds.

I'd stick with the correct bolts or studs. It's not like you're taking the manifolds on and off 2-3 times a year and need the ease of removal.

SS bolts and nuts don't have "grades". The only difference in different SS fasteners is the ss they are made out of, anything from 409 to 316 ss. The ss expansion rates are null with such short fasteners. The expansion rate would make a difference however if the bolts were say 6" long or longer.


Materials

Stainless Steel
Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Stainless steel is highly corrosion resistant for the price and because the anti-corrosive properties are inherent to the metal, it will not lose this resistance if scratched during installation or use.
It is a common misconception that stainless steel is stronger than regular steel. In fact, due to the low carbon content, stainless steel cannot be hardened. Therefore when compared with regular steel it is slightly stronger than an un-hardened (grade 2) steel fastener but significantly weaker than hardened steel fasteners.
Stainless steel is also much less magnetic than regular steel fasteners though some grades will be slightly magnetic.
18-8 Stainless
18-8 refers to any stainless steel containing approximately 18% chromium and 8% nickel. This is the most common stainless designation for hardware. For information on 18-8 stainless steel material properties see our Material Grade Identification and Properties Chart.
Reply With Quote
  #8  
Old 12-15-2012, 11:44 AM
takotruckin takotruckin is offline
Senior User
 
Join Date: Aug 2007
Location: Fresno, CA
Posts: 412
takotruckin has a good reputation on FTE.takotruckin has a good reputation on FTE.
I would use the OEM bolts, they seem to hold up just fine. The 6.4's use stainless and they are breaking very often, and when they break they are a total PITA to get out.
Reply With Quote
  #9  
Old 12-15-2012, 01:58 PM
trekbasso trekbasso is offline
Posting Guru
 
Join Date: Dec 2010
Location: Wellington, Co
Posts: 1,465
trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.trekbasso has a great reputation on FTE.
I will admit I was pleasantly surprised to only have to cut one bolt when I recently replaced my manifold. PB Blaster comes through again. I did go back together with anti seize on everything.
Reply With Quote
  #10  
Old 12-15-2012, 03:23 PM
UNTAMND's Avatar
UNTAMND UNTAMND is offline
Postmaster
 
Join Date: Jul 2009
Location: Lansdale, PA
Posts: 3,449
UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.
I used the "grade" term to compare it to a regular steel bolt. Most people are not aware of material properties like you and I, so we need to use terms most people understand.
I've snapped off many 5/16 stainless bolts with a 3/8drive ratchet. And others I've impacted tight, or had to use a long breakerbar to remove.
You are correct in saying the exact material dictates its strength. (But your stainless example said exactly what I did as far as grade goes)
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Stainless Steel Manifold Studs jacob_powerhouse 1994.5 - 1997 7.3L Power Stroke Diesel 5 09-25-2015 05:10 PM
Stainless Steel or Titanium bolts? Arizona97 6.0L Power Stroke Diesel 6 08-31-2015 10:21 PM
Exhaust Manifold Bolts Shadowrider123 1961 - 1966 F-100 & Larger F-Series Trucks 3 01-22-2015 09:18 AM
460 Exhaust Manifold bolts - Change now before they break? hanajack Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 20 09-17-2014 03:35 PM
460 exhaust manifold/header bolts comming loose johnfl 1987 - 1996 F150 & Larger F-Series Trucks 6 04-24-2002 01:15 AM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 05:25 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.