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03-11-2010, 03:30 PM | #1 |
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Peening a 3/8" x 1" rivet?
Am replacing a bent front stabilizer shaft frame bracket.
The official manual says the rivets are 3/8" x 1". They are pretty large compared to some other rivets. Had read the correct way to put in a rivet by hand is by peening the rivet with a ball peen hammer. One author suggested heating the rivet to red hot before peening. Another did not. Having just started with a large hammer and cold chisel then switched to a grinder to get the old rivet heads off, using a hand held ball peen hammer to peen the rivet doesn't seem like it will get the job done. A frame shop suggested drilling a slightly wider hole in both the bracket and frame and using grade 8 bolts instead of the rivets. Seems to me that GM may have designed with rivets and the holes of specific diameters for a reason. How have you folks handled this situation? Last edited by Wincks2; 03-11-2010 at 03:31 PM. |
03-11-2010, 03:53 PM | #2 |
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Re: Peening a 3/8" x 1" rivet?
Sounds like a lot of trouble to me. I'd just bolt it on and forget it. No aftermarket stuff is riveted on, always bolted on with no issues I'm aware of...
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03-11-2010, 03:54 PM | #3 |
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Re: Peening a 3/8" x 1" rivet?
knock the rivet out and use a grade 8 with nylock nut... I did that to most of my frame...
cut and "X" on the head with a cutoff wheel, and use an air chisel to knock the head off and puch it out...
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03-11-2010, 04:15 PM | #4 |
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Re: Peening a 3/8" x 1" rivet?
If I bolt it on, any idea to how many ft. lbs. I tighten it? As it is replacing a rivet, I'm guessing it would be a lot.
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03-11-2010, 05:53 PM | #5 |
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Re: Peening a 3/8" x 1" rivet?
your thinking too much about this ... just tighten it down till you can't move it anymore ... it's a Grade 8 bolt, you're not going to break it with STANDARD hand tools.
Last edited by Shane; 03-11-2010 at 05:53 PM. |
03-11-2010, 06:13 PM | #6 |
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Re: Peening a 3/8" x 1" rivet?
OK, thanks. Will just tighten it down as well as possible.
What about the width of the hole and bolt considering the threads? Should I drill the holes larger so they will take a bolt on which the amount of solid metal going through the holes is closer to the diameter of the original holes and solid metal rivet? Or would a bolt fitting the existing holes suffice even though the diameter of solid metal would be less due to the threads? Do you folks always drill a bigger hole rather than use the original hole diameter? |
03-11-2010, 06:15 PM | #7 |
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Re: Peening a 3/8" x 1" rivet?
OK, thanks TX Firefighter. 3/8 bolts it is.
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03-11-2010, 09:57 PM | #8 | |
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Re: Peening a 3/8" x 1" rivet?
Quote:
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03-11-2010, 06:05 PM | #9 |
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Re: Peening a 3/8" x 1" rivet?
Just use a grade 8 bolt, 3/8 size.
Industry standard is 44 ft/lbs torque with a plain steel bolt and 33 ft/lb with a plated one. Just tug it hard with a long 3/8 drive ratchet and 9/16 socket. The FAA taught me years ago that a properly torqued equivalent sized bolt is just as good as a rivet in usage. If it's good enough for planes it's good enough for old trucks.
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03-11-2010, 11:14 PM | #10 |
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Re: Peening a 3/8" x 1" rivet?
tractor supply has grade 8 hardware for $4 a pound... It doesn't need over tightened, i've broken one with a long handled ratchet...
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03-12-2010, 09:24 AM | #11 |
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Re: Peening a 3/8" x 1" rivet?
without a torque spec "over-tightened" is open for debate ... thus my reply about STANDARD hand tools.
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03-12-2010, 10:38 AM | #12 |
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Re: Peening a 3/8" x 1" rivet?
OK, thanks.
Hand tools are what I have for the most part. Because I had read that ft lbs were relevant for some applications I bought one of those bars that accepts a socket on one end and has an arrow that moves to show how many ft lbs are being applied. Thanks again for all of the guidance! |
03-12-2010, 11:46 AM | #13 |
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Re: Peening a 3/8" x 1" rivet?
torque wrench... my service manual has specs, it's based off the 3/8's bolt, not the location of the bolt. I'll check if you want to be sure, not that big of a deal to me...
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03-12-2010, 12:23 PM | #14 |
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Re: Peening a 3/8" x 1" rivet?
Does the military use AC-43.13 for reference material for your repairs ?
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03-12-2010, 01:49 PM | #15 |
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Re: Peening a 3/8" x 1" rivet?
Agree on the bolt - that was the "in plant" repair for an improperly installed rivet.
In fact, I tried to get them to use all bolts instead of rivets for the spring hangers on my truck when I had it built - but they wouldn't do it... K
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03-15-2010, 11:32 AM | #16 |
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Re: Peening a 3/8" x 1" rivet?
According to my Pocket Ref by Thomas J Glover (book you see in every hardware store) 3/8 Grade 8 dry torque is 43.6 ft-lbs. for 7/16 it is 69.8 lbs.
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03-15-2010, 11:34 AM | #17 |
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Re: Peening a 3/8" x 1" rivet?
I'd say that's pretty close to the 44 ft/lb I typed in post number 6.
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03-21-2010, 11:06 AM | #18 |
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Re: Peening a 3/8" x 1" rivet?
I worked for Caterpillar for 30 years and Cat uses Grade 8 on everything. Use a grade 8 nut with your grade 8 bolt and your joint should be stronger than a rivet which is made from softer material in order to be peened. Stop by your Cat dealer and pick up a copy of "One Safe Source". This has a fastener catelog for Grade 8 nuts and bolts and much more. A good reference book and free.
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