Injector Hold Down Bolts
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FTE-Spread The Knowledge
Joined: Feb 2008
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Injector Hold Down Bolts
Would it be a good idea to change the injector hold down bolts when I do the injector o-rings? They have never been out at 333,000 miles.
Plan on doing glow plugs, injector wiring, valve cover gasket's, intercooler pipes and the dreaded oil cooler.
Thx!
Plan on doing glow plugs, injector wiring, valve cover gasket's, intercooler pipes and the dreaded oil cooler.
Thx!
Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
Likes: 22
From: Springfield, PA
I did injectors on one engine - the '97, and then orings on the '99 without replacing the bolts, and had no issues, but thoroughly cleaned them and the holes with either alcohol or acetone. The '97 hung around for another 18 months until it was hit in an accident, and the '99 I hoped was an oring problem, but I still had issues and finally went with remans and new cups about two years later. The second time after going into the '99 I bought new bolts, mostly because it would be the third time re-torquing the same bolts, but also as cheap insurance to try and avoid a local showing of the Rich & Stinky Whack-A-Mole play. Again, thoroughly cleaned the holes and new bolts.
They're not that expensive, and if you do have issues, one side of the injector bolts can't be removed without pulling the injector, which is quite a mess.
They're not that expensive, and if you do have issues, one side of the injector bolts can't be removed without pulling the injector, which is quite a mess.
Senior User
Joined: Jan 2011
Posts: 175
Likes: 1
From: Lampe, MO
New bolts
I would replace the bolts as the process of torqued bolts is the stretching of the bolt. Once stretched steel will not return to its original length. Get the bolts!
One more thing, you should lubricate the bolt before you install them to obtain the true torque spec.
One more thing, you should lubricate the bolt before you install them to obtain the true torque spec.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Mine have been in and out a minimum of 3 times each some up to 6 on the original bolts. The last time was almost 2 years ago and I have not had one back out yet. Torqued with some loctite.
Senior User
Joined: Mar 2015
Posts: 320
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I would replace the bolts as the process of torqued bolts is the stretching of the bolt. Once stretched steel will not return to its original length. Get the bolts!
One more thing, you should lubricate the bolt before you install them to obtain the true torque spec.
One more thing, you should lubricate the bolt before you install them to obtain the true torque spec.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I changed my injectors back around 300k miles or so just for good measure. I just used my same old injector bolts. Didn't see a reason to replace them.
Only got 550,000 on them bolts now so who knows if they'll last or not.
Only got 550,000 on them bolts now so who knows if they'll last or not.
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FTE-Spread The Knowledge
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Ok great, thx! Was your under the valve cover injector wiring in good shape?
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Hotshot
Joined: Mar 2014
Posts: 10,750
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From: Douglassville, PA
I know that the injector bolts are on the small side but they're getting torqued to 120 in lbs, or 10 ft lbs, I find it hard to believe that this kind of 'stress' would stretch even those bolts.
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Lead Driver
Joined: Jun 2013
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From: north of Minneapolis, MN
The oil cooler is far from dreaded....the injector orings can lead you down a path you never wished to go down.
Cargo Master
Joined: Mar 2008
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From: Archdale,N.C.
When I did inj orings I replaced my hold down bolts just for good measure. Were they bad.. I don't know. But I feel good about replacing them. When I have to repair/replace something on my truck I try to do any and all related parts as well. OCD.. Maybe 
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Joined: Dec 2012
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From: Oakdale, CA
I have never replaced the bolts in any of the sets of injectors I have done, unless one was damaged. The TQ you put on them is not enough to alter them. For the small cost, I guess it wouldn't be a bad idea, but I wouldn't lose sleep over re-using the bolts.
Senior User
Joined: May 2012
Posts: 438
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From: Sioux Falls, SD
On my first injector job I cracked off an injector bolt while torquing it. The only way I can understand it is that the guy before me must have over-torqued them once. Hours of drilling and helicoiling later, I now get new bolts every time I even mess around under the valve covers of any of our trucks.