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Old repair on cills going bad

A

Alexw

Member
Ive been repairing some minor rust damage on the bottom of my pasenger side door and have hit the "while im there" bug - the cills have an old repair by the previous owner but it doesn't look very healthy anymore. You can see in the picture the exact repair, i don't know why its bubbling like that but i hope its not too bad. I was going to dig the lot out and fill it in with body filler as ive got some of that lying around. Using antirust primer and maybe that rust prevention stuff that i cant remember the name. The inside of the cill (sill???) is fine im just worried theres rust in there eating its way in and out. Any advice on this would be greatly appreciated!

Cheers

DA6943A299F54CA69613E8E04CBBDBE1.jpg
 
The previous owner probably did just that, use filler to bridge the hole. Filler soaks up moisture causing more rust. The best thing is to take the area back to bare metal and see how much damage there is. If localised, you can butt weld in a repair patch of 1mm steel, if extensive then it might be better to replace the whole sill. Won;t know how bad it is till the paint is removed. Once repaired, protect the inside with waxoil.
 
Alex

that looks pretty bad. If it is rusting just under the paint and has not gone right through the metal then you'll be ok. You will be able to rub back to metal and repaint.

If it has rusted through from behind then you will need to weld new metal in. It will be too big a hole to repair with filler.

If you have not already done so, remove the black vent in the B pillar and look behind into the cill.

Shaun

I wouldn't let this issue put you off buying a 944. But it is something you need to check very carefully before buying. You can check out part of the cill by removing the black vent
 
Hi Alexw
I'm sorry your going to have to be brave, and get it back to bare metal, to see whats, what other wise you will be back to square one, in no time at all. Once the tin worm starts you need to be quite agressive to protect the rest of the car.

*Shaunp* You shouldn't be put off, you need to remember that these are old cars, and to a more or less extent will have problems of one kind or another, i guess thats part of the charm of owning one. Rule of thumb always applys though, buy the best you can, its easyier to buy a more expensive well mainatined Porsche than a cheap one and do up, but each to there own. Go and test drive some, get a feel, a bad one will really stick out, and a genuine seller will be more than happy to talk to you about there car. I have a 924s and a 911 and theres always somthing to do, hasn't put me off.
 
Im guessing its a reasonable sized hole, as a temporary repair would taking out all the filler, rubbing back to the bare metal and coating with antirust primer help prevent any more damage, before i can get it into a body shop?
 
thanks guys guess its a case of going to see loads till the right one shows up looking to buy between now and may
 
ORIGINAL: shaunp

im really havin second thoughts about buying a 944 they all seem to have this prob
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All 15-20 year old cars are likely to have some rust somewhere. These cars were warranteed for 10 years when new which back then was pretty exceptional.
You can't expect to buy a car of this quality for peanuts and not have to budget some money to bring it back to sound condition.
When you think of the silly money these supercars sell for you just need to budget a £1000 -£1500 or so to fix the cills and you have a brilliant classic car costing under £5000 that should last another 10 years with zero depreciation [;)]

The alternative is to buy a faceless characterless Golf or some such [:(]
 
ORIGINAL: Alexw

Ive been repairing some minor rust damage on the bottom of my pasenger side door and have hit the "while im there" bug - the cills have an old repair by the previous owner but it doesn't look very healthy anymore. You can see in the picture the exact repair, i don't know why its bubbling like that but i hope its not too bad. I was going to dig the lot out and fill it in with body filler as ive got some of that lying around. Using antirust primer and maybe that rust prevention stuff that i cant remember the name. The inside of the cill (sill???) is fine im just worried theres rust in there eating its way in and out. Any advice on this would be greatly appreciated!

Cheers

DA6943A299F54CA69613E8E04CBBDBE1.jpg
Click to expand...


Alex
that looks to me like the last cill was galvanized metal and the repairer didn't prepare the bare metal with the correct preparation and primers . Cellulose will always pickle if the metal isn't prepared properly first. Paints can also react with each other .
If the cill was rubbed down too vigerously then some of the galvanising could have been removed completly leaving exposed metal .
I would google for some advice on paint prep on galv metal

If you need to let a small piece of metal in don't butt it together as it will always blow and the heat will distort. Best to borrow or hire a `joddler' which forms a rebate to the edge so that there is a nice strong overlap and the two pieces of metal lie nice an flush together
 
ORIGINAL: peanut
All 15-20 year old cars are likely to have some rust somewhere. These cars were warranteed for 10 years when new which back then was pretty exceptional.
You can't expect to buy a car of this quality for peanuts and not have to budget some money to bring it back to sound condition.
When you think of the silly money these supercars sell for you just need to budget a £1000 -£1500 or so to fix the cills and you have a brilliant classic car costing under £5000 that should last another 10 years with zero depreciation [;)]

The alternative is to buy a faceless characterless Golf or some such [:(]
Click to expand...
Good answer IMHO
And that Golf of 20 years will have more rust in more places than the equivalent priced 944/924. I know for certain [:mad:]
 
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