Metal buried in tyre carcass ?

I've got the same problem with two of my part worn 7.50x16 crossply tyres.
Fitted them to repainted 5.5 rims with brand new tubes.
After a few days both developed punctures despite me having checked the insides of the tyres very carefully before fitting them.
Fixed the punctures, checked for any foreign objects protruding into the inside of tyre.
Nothing by eye or by finger touch.
Same thing happened again within about a week.
My thoughts are that there are bits of metal, like a piece of nail or screw stuck somewhere in the tyre carcass.
When I hit a bump or a pothole, I reckon it's pushing it through enough to hole the tube.
Damned if I can find them, I've tried marking the tyres against the rim before removing, so I can align the hole in the tube with the tyre carcass.
Can't see or feel anything.
Bugger !
Any easy way to solve this, short of having the tyres X-rayed ?

Very Soapy water. Pour onto tyre & get someone to watch for leaks/bubbles as you move forward

Sorry, but I tried that, I should have said.
No air bubbles coming through the tread area on the tyre.
Once the tube is holed the air is working it's way around to the join between tyre and rim, or coming up the side of the valve stem

I might just give it another try, just in case I get lucky third time around

Mark the tyre before you remove from rim so you can place tube in exact position, it might pay to put a patch on inside of tyre

Is the tyre designed for tubes?
Only asking as the internal ribs in tyres can rub tubes

freelance said:

Mark the tyre before you remove from rim so you can place tube in exact position, it might pay to put a patch on inside of tyre

Click to expand...

Tried that and can't find anything.
Maybe my alignment skills aren't as good as I thought.
My thoughts are that if it's something sharp inside the tyre carcass, putting a soft rubber patch over it isn't going to stop a puncture, but it might just reveal the location of the foreign object.
I'll give it a try this weekend.
At least it won't cost me much, just a lot of sweating, grunting, and swearing (I'm not brilliant at changing tyres, but I get by)

Hicap phill said:

Is the tyre designed for tubes?
Only asking as the internal ribs in tyres can rub tubes

Click to expand...

Yeah, one is a Deestone Extra Traction (tubed), and the other is an ancient Olympic Mud Plugger (remould made in Australia)

I'm just wondering.
I've got a couple of tubeless type rims kicking around somewhere.
Now if I fitted the proper tubeless type valve insert, what if I were to fit my old tube type crossply onto one WITHOUT a tube in it.
I'm well familiar with the old petrol/butane gas trick to blow the tyre tight onto the rim.
I wonder if I could get the tyre to seal to the rim well enough to inflate properly.
Obviously tube type tyres are not designed to seal to the rim bead.
Maybe that would finally reveal the hole/object hidden in the tread area ?

It might sound like a very long winded way of solving a problem, but at least it would be cheap.

Quite early on in my LR 'journey' I had a couple of punctures on my 110. Then on the SIII. I checked and checked. Still got them. Turned out that rust powder was getting under the edges of the various stickers inside the tyre. Had the rims all blasted, took any stickers out. No more punctures. Since then though both the Lightweight and project have tubeless rims. I don't like the idea of a tube going on a motorway, even if I am only doing 60.

Sounds like your nipping the tube when fitting the tyre, seen it countless times.