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Old 02-12-2012, 03:57 PM   #1
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Drilled some drain holes in my frame. I got pics

So we have been discussing how to clean out our frames and how alot of us have issures with mud and rust in our frame. well i have a ton of mud in my frame so in order for me to rust treat it later on i need to clean it. I have tried flushing it with the hose but alot of the stuff is too hard and heavy for water to carry it over the sides and out the factory holes. I needed holes on the bottom to let water carry the mud to drain.

we drilled 4 holes in the frame, 2 on each side. 1 behind the front tire and one in front of the rear tire. when we first broke threw a crap load of water drained out, my jeep had to pee
In there pics my transfor case skid plate is off because we were fixing some rust and painting.


passenger rear

drivers front
look at the goopy mess i need to get started on...ewww


we went below freezing recently so i gotta wait to do any flushes with the new holes.

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Old 02-12-2012, 04:00 PM   #2
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Looks good....i might need to do this....my frame is full of rust flakes and stuff.

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Old 02-12-2012, 04:02 PM   #3
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Looks like a good idea. Maybe throw some paint over the bare metal of the holes later.
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Old 02-12-2012, 04:11 PM   #4
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Looks like a good idea. Maybe throw some paint over the bare metal of the holes later.
I did that exact thing. Drilled two holes and painted over them.
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Old 02-12-2012, 04:16 PM   #5
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i painted them already, the reason the transfor case was off was to clean up rust that built up between the plate and frame.
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Old 02-12-2012, 04:36 PM   #6
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Old 02-13-2012, 08:09 AM   #7
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Plan to do this once it warms up. the shit in the frame is driving me crazy.
What size holes did you end up drilling?
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Old 02-13-2012, 11:59 AM   #8
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Im not sure lol, we were going to do 1/2 inch but the bit was not working as well as we wanted. so I know its just a little smaller then 1/2 inch.

Our method to drilling the hole was to start with a small bit (thinner then a pencil) then go up in size a little more, then take your final size and drill again.
you can't just take a huge bit and push it into thick steel and expect it to cut, it needs an edge to eat at.

yeah, Im not a fabricator lol
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Old 02-13-2012, 12:26 PM   #9
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I'd hate to see what kind of garbage has accumulated in my frame to this point :\
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Old 02-17-2012, 10:44 PM   #10
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I might be wrong. But will drilling the top or bottom of the frame weaken it? I always heard it would....Im about to drill thru the sides of mine and paranoid about weakening it. I been wrong before. I wouldn't drill top ot bottom of mine.
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Old 02-17-2012, 11:29 PM   #11
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OK ~~~ 1st, your looking at a BOXED FRAME, NOT a
Channeled Frame. Drilling a 1/2" hole even in a Channeled
Frame WILL NOT hinder the integrity of the Frame,
SO with a Boxed Frame, that possibility is even far less.
Having owned my own Restoration Shop for many years,
We have cut, drilled and Modified countless Frames on
Resto Mods, Hot Rods, and Custom Fabricated Rides
for many years. Even Vehicles with an excess of 500 HP.
I had a Competitor that more often than not, would make
numerous Mods on Frames, ie, 3" holes drilled through
Frames for running Custom Exhaust Systems in Veh.
running in excess of 900 HP.
So put your Minds at ease, 1/2" Holes shouldn't even be
given a second thought.
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Old 02-17-2012, 11:31 PM   #12
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I might be wrong. But will drilling the top or bottom of the frame weaken it? I always heard it would....Im about to drill thru the sides of mine and paranoid about weakening it. I been wrong before. I wouldn't drill top ot bottom of mine.
Technically yes, any hole you drill in the frame would weaken it, even a 1/64 hole. The amount it weakens it by would be so miniscule though that I dont think it would matter at all. The frames are pretty stout, are you really worried that you are going to bend it?

I would look at it this way - Rust is going to weaken your frame WAYYYY more than a few small holes ever would. Not drilling a hole because you're afraid it will be weakened only to let rust eat right through it from the inside seems kind of backwards to me.
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Old 02-25-2012, 06:59 AM   #13
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Technically yes, any hole you drill in the frame would weaken it, even a 1/64 hole. The amount it weakens it by would be so miniscule though that I dont think it would matter at all. The frames are pretty stout, are you really worried that you are going to bend it?

I would look at it this way - Rust is going to weaken your frame WAYYYY more than a few small holes ever would. Not drilling a hole because you're afraid it will be weakened only to let rust eat right through it from the inside seems kind of backwards to me.
Im into Semi trucks, If you drill a hole in the top or bottom of a frame on them, They have a high tendency to collapse. So, I just think it would not be good to weaken MY frame in any manner. To each their own. I would never drill top or bottom of any frame. But, Thats just me. I don't really know anything for sure. I do know, I drilled a hole in the side of it to mount my sliders, And it drill very easy with a cheap walmart drill bit, So, They are not thick at all. Mine is a 92 has no rust. I look at it, If i cant keep it clean, It needs to rust. But again....That's just me.
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Old 02-25-2012, 07:52 AM   #14
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Originally Posted by Manwithplan46151
Im into Semi trucks, If you drill a hole in the top or bottom of a frame on them, They have a high tendency to collapse. So, I just think it would not be good to weaken MY frame in any manner. To each their own. I would never drill top or bottom of any frame. But, Thats just me. I don't really know anything for sure. I do know, I drilled a hole in the side of it to mount my sliders, And it drill very easy with a cheap walmart drill bit, So, They are not thick at all. Mine is a 92 has no rust. I look at it, If i cant keep it clean, It needs to rust. But again....That's just me.
That's because semi frames are different from a conventional car or truck frame. They see higher stresses and loads. You'll notice on semi frames they have little placards that say do not drill or weld on frame.
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Old 07-16-2014, 06:09 PM   #15
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Revival! So Need help, Was about to drill my frame. Had Eyepro on and everything. Then I wondered what size hole people use so I googled it. Ran into a thread on Jeepforum quoting the FSM. Found it in mine here is a cut and paste.

FRAME REPAIRS
DRILLING HOLES
Do not drill holes in the top and bottom of frame
rail, metal fatigue can result causing frame failure.
Holes drilled in the side of the frame rail must be at
least 38 mm (1.5 in.) from the top and bottom
flanges.
Additional drill holes should be located away from
existing holes.

That said a 900 HP car builder said its ok. A trucker supported the FSM. Those cars twist frames for sure trucks stress them as well.

Other searches find people saying you need to hose it out when ever you can don't drill holes. If you live in the salt belt and its winter its below freezing. You get filled with salt spray that has to stay until warm weather as it can not drain and unless you can heat water and spray it its not happening.

Sooo... Has anyone ever had a frame fail from drilling a hole near each control arm? Or even heard of one? If you have done it what size bit did you use? Clearly I have heard of t case skid bolts rotting right out of the frame. That sounds worse than holes to me. Funny the FSM don't cover how to fix design flaws lol.

Thanks for your help guys.
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Old 07-16-2014, 06:30 PM   #16
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IMO there are plenty of holes in the frame already to properly flush the rails. Clean them well in summer, treat the inside with a rust inhibitor and be diligent with Maintinance and you'll be fine.
When was the last time you dropped your skid plate to see if there was rust between the rail and the plate?
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Old 07-16-2014, 06:40 PM   #17
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IMO there are plenty of holes in the frame already to properly flush the rails. Clean them well in summer, treat the inside with a rust inhibitor and be diligent with Maintinance and you'll be fine. When was the last time you dropped your skid plate to see if there was rust between the rail and the plate?
There is none. Outside is practically new. I under coated heck out if it to include between that skid. Sanded first it's dropped. (Owned since new got mild OCD lol) Problem is I found some flaking metal sticking fingers in oval holes by control arms. (I'm prepping for Eastwood) I got som quarter sized flakes. Outside looks amazing. Near tcase inside where I can reach it's smooth painted feeling. The rear inside control arm has more flaking than front. Obviously that's from the salt spraying that way.
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Old 07-16-2014, 06:47 PM   #18
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Just did Eastwood internal coat today. I recently removed skid and welded new metal in place cleaning much of the rust out then. Found more today and got as much as I could out with the air gun. I drilled 4 holes, all about 1/2inch I believe (was a while ago). I really worry about rust inside the frame... I almost want to seal the side holes up with some metal tape and have the bottom holes I drilled exposed, at least when I go wheeling and maybe winter time.
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Old 07-16-2014, 06:48 PM   #19
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Skid. Mud not rust.

Second pic black squiggle is from pressure washer. Took off under coating. You can see it's getting eaten from inside hole. Inside there felt solid but it's flaking has begun.
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Old 07-16-2014, 06:50 PM   #20
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Just did Eastwood internal coat today. I recently removed skid and welded new metal in place cleaning much of the rust out then. Found more today and got as much as I could out with the air gun. I drilled 4 holes, all about 1/2inch I believe (was a while ago). I really worry about rust inside the frame... I almost want to seal the side holes up with some metal tape and have the bottom holes I drilled exposed, at least when I go wheeling and maybe winter time.
While like years? Been wheeling since? I'm looking at the frame weakening aspect. Thanks for the reply.
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Old 07-16-2014, 07:19 PM   #21
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"While" like a few months, but my frame is a pretty bad inside. I haven't been wheeling long or hard, but a 1/2in hole in a boxed frame shouldn't be that big of a deal, just think about these guys running jeeps with completely compromised frames with bad rot, by the looks of your frame, you look to be in good shape.
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Old 07-16-2014, 07:26 PM   #22
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I will probably end up doing this when I get my new trail arm panel welded in so I can use the Eastwood product.
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Old 07-16-2014, 07:30 PM   #23
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"While" like a few months, but my frame is a pretty bad inside. I haven't been wheeling long or hard, but a 1/2in hole in a boxed frame shouldn't be that big of a deal, just think about these guys running jeeps with completely compromised frames with bad rot, by the looks of your frame, you look to be in good shape.
X2 man. I'm going for it tomorrow. Sinister I value your opinion and thank you. This salt does crazy stuff. If you seen my frame I maintained so well then felt those flakes lol. It like I have done everything I know of other than Eastwood and drilling. After knowing it 14 years I'm seeing drilling as a help. Not weakness. Considering I have to trust a chemical alone to stop it if I do nothing more. Thanks for the help Bet. I couldn't find a frame failure from drilling. Didn't think I would. Ya it's weakens it but how much over designed crap has holes drilled in it to make it lighter? I physically can't see it hurting anything myself. I just won't jump it any more.
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Old 07-16-2014, 11:09 PM   #24
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You could always use the line about having added crumble zones in the event of an unforeseen "Oh Crap" occurrence.
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Old 07-17-2014, 02:40 AM   #25
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Looks good....i might need to do this....my frame is full of rust flakes and stuff.
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Old 07-17-2014, 10:04 AM   #26
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If you intend to clean the inside of a boxed frame then I suggest a pressure washer, place through the existing holes, and wear protective goggle while doing this.
To clean a dry boxed frame, I suggest using an air compressor and an air wand placed through the existing holes in the frame, and also wear protective goggles while spraying.
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Old 07-17-2014, 11:49 AM   #27
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You could always use the line about having added crumble zones in the event of an unforeseen "Oh Crap" occurrence.
Lol. I think I'm going to skip the holes for now since you put it that way. I'm positive I can clean it with out the holes. Found low pressure water is working better than my pressure washer. And read a great tip about a magnet on a flexible rod to get the flakes. I'm just going to Eastwood it for now. If the flakes come back then it's hole time. I'll update this next summer after the winter salt and let everyone know how it holds up.
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Old 07-17-2014, 12:54 PM   #28
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Problem with leaving no holes now is that the water just sits and the rust encapsulator you're putting in there is great, but it's not going to last as long just sitting in water. I think you are way over thinking the strength of your frame. Boxed frames are very strong, especially if we're talking one in good condition like yours. That's just me though. After seeing my frame full of water a few times, drain holes are no question for me.
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Old 07-17-2014, 03:37 PM   #29
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After driving 40 miles up and down the National seashore you can only imagine how much sand accumulated in the frame. I thought to myself about drilling drain holes but then was concerned about compromising the strength of the frame. So I did some research and now will be confidently going forward with drilling drain holes.
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Old 07-17-2014, 06:43 PM   #30
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Well. I did the passenger side of the frame tonight.. I bought a second TJ a couple weeks ago that sat in a barn for two years. No frame rot but surface rust on the frame. What worked for me I think. I jacked the front up high. I have an air jack so that was easy. I used a blow gun with a stiff plastic hose and worked from front to rear. After 3 hours and a shop vac with the blow gun I am sure I got 99% of the crap out. Then I sprayed the Eastwood frame coating inside.. Hopefully it at least slowed down the rust inside.. A medium size shop vac in the hole by the rear control arm mount seemed to work well. The hose fit in the hole and got everything there.. We will see..

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