Injector Re-torque
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
I only say that because I’ve installed LOTS of injectors and none have ever gotten loose. The set in my truck now have about 125k miles on them.
I’ll see if I can verify what torque they are when I install the 250/200’s soon.
I’ll see if I can verify what torque they are when I install the 250/200’s soon.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
Likes: 110
From: Western AR
I have pulled/replaced a "few" injectors myself, and I wouldn't think all that much. The bolt, being on a slightly raised surface from the oil drains at the bottom of the head, doesn't have a bunch of oil built up around it like the glow plugs. I don't see much (if any) oil on the bolts when I pull them, either.
Thread Starter
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More Turbo
Joined: Jun 2017
Posts: 731
Likes: 15
From: Arizona
I was trying to look up what Grade and size the bolts are but none of the descriptions given for Ford Part F4TZ9R523A say. The give a length but that seems to be it.
Anyone know for sure?
Anyone know for sure?
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
I thought the injector hold downs were closed bottom holes... oh well live and learn
Lead Driver
Joined: Jun 2013
Posts: 5,648
Likes: 893
From: north of Minneapolis, MN
They are a blind hole, it's just that the bolt doesn't bottom out in it.
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Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
So if one had enough oil in it it could potentially hydro lock or give a false torque???
Lead Driver
Joined: Dec 2006
Posts: 7,093
Likes: 147
From: San Diego, CA
Sure, but even though there's a sheen on everything underneath the VCs from the oil splashing around there's very little that hangs around above the injectors. The VCs barely clear everything when installed (the gasket gives it just enough spacing to clear the injector solenoids).
With the holes on top it would take a lot to get any real fluid in there. The only time I've cleaned the holes out was at 310K miles when I put in new cups, injectors, and replaced all the hold-down bolts. There was some oil moisture in there and very little at the bottom of the bore.
If I still had the truck I would only remove the bolts (and clean the bores) if I had to remove the injectors. I would not make a specific effort to remove the bolts and clean the holes unless I was using threadlocker like @Tugly does.
With the holes on top it would take a lot to get any real fluid in there. The only time I've cleaned the holes out was at 310K miles when I put in new cups, injectors, and replaced all the hold-down bolts. There was some oil moisture in there and very little at the bottom of the bore.
If I still had the truck I would only remove the bolts (and clean the bores) if I had to remove the injectors. I would not make a specific effort to remove the bolts and clean the holes unless I was using threadlocker like @Tugly does.
Logistics Pro
Joined: May 2017
Posts: 4,667
Likes: 1,455
From: Muskogee, Ok
So for more fuel on the flames of the subject...
The highest torque value i can find in any "manual" form for injector bolt holes threads comes from cup seating instructions off Riff Raffs site. 35 ft pounds to seat the cup, using the 2 injector hold down bolt holes in the head. So 420in pounds, spread across the 2 bolts, so 210in pounds per bolt. BUT..... That's not using injector hold down bolts, or an injector and all its parts, crush washers, or orings during thousands of miles of hard driving. It's for seconds during the cup seating install. So although the bolt hole threads in the head can take the torque momentarily, i still wouldn't go to 30foot pounds, (360 in pounds?) for the 1 injector hold down, that's still 150in pounds more than the cup install torque on one bolt. To much risk for me in my "shade tree mechanic" driveway. Now if i were taking it down the road to Jason as a customer knowing broken bolts would be his concern, I'd say have at it
How's that for dumping some gas, err i mean diesel, on the fire
And yes, torque values are different on dry vs lubricated (oil, loctite, water, soap) bolts. There's charts on that too
The highest torque value i can find in any "manual" form for injector bolt holes threads comes from cup seating instructions off Riff Raffs site. 35 ft pounds to seat the cup, using the 2 injector hold down bolt holes in the head. So 420in pounds, spread across the 2 bolts, so 210in pounds per bolt. BUT..... That's not using injector hold down bolts, or an injector and all its parts, crush washers, or orings during thousands of miles of hard driving. It's for seconds during the cup seating install. So although the bolt hole threads in the head can take the torque momentarily, i still wouldn't go to 30foot pounds, (360 in pounds?) for the 1 injector hold down, that's still 150in pounds more than the cup install torque on one bolt. To much risk for me in my "shade tree mechanic" driveway. Now if i were taking it down the road to Jason as a customer knowing broken bolts would be his concern, I'd say have at it
How's that for dumping some gas, err i mean diesel, on the fire
And yes, torque values are different on dry vs lubricated (oil, loctite, water, soap) bolts. There's charts on that too
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa