120y
Part of things
Posts: 423
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Jun 29, 2016 18:53:43 GMT
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I had a patch of surface rust on the sill of my 96 clio mk1, i have cleaned it up and the metal is good apart from 2 pinprick holes. They are situated on the top of the sill under the rear passenger door. My question is what you do ? make the holes bigger and weld them up or stick a spot of filler in them. As i say they are the size of a pin or needle you have to get up close to even see them. Thanks.
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Last Edit: Jun 29, 2016 18:54:13 GMT by 120y
1996 Renault Clio MK1 1.4 RT Auto
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Rob M
Posted a lot
Posts: 1,915
Club RR Member Number: 41
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PinPrick holes in Sill Rob M
@zeb
Club Retro Rides Member 41
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Jun 29, 2016 19:25:47 GMT
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I had a patch of surface rust on the sill of my 96 clio mk1, i have cleaned it up and the metal is good apart from 2 pinprick holes. They are situated on the top of the sill under the rear passenger door. My question is what you do ? make the holes bigger and weld them up or stick a spot of filler in them. As i say they are the size of a pin or needle you have to get up close to even see them. Thanks. Weld. Done the same thing myself in the past, didn't bother making the holes bigger just made sure that all surrounding metal was A1 then stuck a couple of welds in the holes, ground them down and finished off. You put filler in them and it wont last 5 mins, false economy.
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120y
Part of things
Posts: 423
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Jun 29, 2016 21:06:19 GMT
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Thankyou
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1996 Renault Clio MK1 1.4 RT Auto
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fazzer
Part of things
Posts: 213
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Jun 29, 2016 21:51:25 GMT
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if you can weld just cut a square out in sill removing all rot then weld a plate in,you wont get pinholes in good metal if you bodge it now next year you will be fitting a new sill.
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sb
Part of things
Posts: 725
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Jun 29, 2016 23:01:56 GMT
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As above pin holes likely mean that the metal is in a bad way on the other side.
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Jun 29, 2016 23:19:36 GMT
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Hi, cut out and weld as said because it won't be long before you can get your finger in those pin prick holes.
Colin
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Jun 30, 2016 20:42:19 GMT
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I don't think I've ever seen surface rust on a sill, it's always rusted from the inside out. What looks like surface rust, is where the sill has rusted out from the inside, then let water through the pinprick hole which caused the bubble in the paint and caused a bit of rust on the outside.
The metal surrounding the hole will be wafer thin, the holes are just where it ended up thin enough to go through. Go at at as hard as you can with an old screwdriver, if you can poke it through then it would have rusted out within a few months anyway. It'll need welding.
And from experience it might seem simpler to keep the patch as small as possible, it's almost always easier to make a bigger patch - I'd always extend at least 3cm from the edge of any rust hole.
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Rob M
Posted a lot
Posts: 1,915
Club RR Member Number: 41
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PinPrick holes in Sill Rob M
@zeb
Club Retro Rides Member 41
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Jun 30, 2016 22:08:48 GMT
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I don't think I've ever seen surface rust on a sill, it's always rusted from the inside out. What looks like surface rust, is where the sill has rusted out from the inside, then let water through the pinprick hole which caused the bubble in the paint and caused a bit of rust on the outside.
The metal surrounding the hole will be wafer thin, the holes are just where it ended up thin enough to go through. Go at at as hard as you can with an old screwdriver, if you can poke it through then it would have rusted out within a few months anyway. It'll need welding. And from experience it might seem simpler to keep the patch as small as possible, it's almost always easier to make a bigger patch - I'd always extend at least 3cm from the edge of any rust hole. Not always the case tbf. If the location, as in this case, is on top of the sill under the passenger door its just as likely to have been caused by wear on the sill by people getting in and out over its 20 year lifetime. That weakens the paint and water may well sit on it as it runs down the door. Not saying that's its 100% the case here but its a possibility due to the pin holes location? Either way, you are probably right, cut it out and lob a piece in to be sure.
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ChasR
RR Helper
motivation
Posts: 10,202
Club RR Member Number: 170
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PinPrick holes in Sill ChasR
@chasr
Club Retro Rides Member 170
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Jun 30, 2016 22:54:55 GMT
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As said, get back to fresh metal and put in a neat patch from there.
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What is it worth to you?
If you just want the car on the road for a few years, then give it a tap over the spot, fill with all-metal and call it a day.
If this is a restoration that you want to hand down to the next generation, open a hole big enough to get a good idea of what lucks behind, use the hole to coat everything in POR rust encapsulator, and weld in a new piece of tin.
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Ive been dealing with this exact same issue, but normally could see the other side. pin holes are usually only small areas of rust. If you just plug weld them the metal will melt back to the nearest area of decent thickness. You may end up plug welding quite a large hole in the end but the result will be sound.
The problem is, there will be others that havent gone through yet. It may be one or two pin holes but the damaged area may be 1" diameter or 12" diameter. No way or knowing unless you can see the back. You may have decent metal with lots of 'nearly holes' scattered every cm or so.
You either need to cut out enough to get a look behind to see how far it extends (little mirror on a stick?), or if thats not possible you may as well plug them as anything else is just guesswork.
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Last Edit: Jul 1, 2016 9:19:35 GMT by VW
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