I washed my car today and found water in the footwells on both sides (not much but enough to concern me). I could feel that it had dripped down from behind the dashboard.
The most likely culprit looks to me to be the scuttle vent but does that really make sense? Maybe the windscreen seal? Any idea's?

 

the wiper shaft seals, (the seals under the chromed angled escutcheons).

 

Wiper shaft seals as Jose says. Lower corners of windscreen. Scuttle vent is well drained so only if rust is present or drain pipe is blocked. Quarterlights (No Draught Ventilators) can't take a direct blast from a hose but you would have noticed that.

Scuttle vent drain tube.

 

Lower corners of the screen are likely and it's fairly easy to see the water coming through. Unfortunately, leaks there are not so easy to resolve or at least weren't 40 years ago. Some modern sealants may be more effective and less messy.
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I think it would be prudent to look inside the heater plenum chamber, (scuttle vent), as the bottom can rust out.

 

I have had success with this stuff fixing a ripped door seal om my XK8. PERMATEX BLACK SILICONE ADHESIVE SEALANT.

 

It's a fairly recent body off full restoration so I hope nothings rusted through yet!

 

This is typical ill fitting rubber. You must seat the bottom corners of the windscreen properly & first. No the chrome trim does not improve the situation. I thew many ill fitting rubbers away.






Correct fitting. Excuse resolution. Snipped from a much larger Photo.

 

BTW ~ I found COH Baines rubbers to be moulded & shaped correctly. Otherwise I suppose you can fill up the gap with Sikaflex, Den Braven, or your black sealant of choice but it looks awful.

 

I will make a photo on Thursday when I am back. I thought it looked pretty good on the underside of the seal. Maybe it’s coming from the glass side of the seal?

 

The leak on my car was from the glass side of the seal (which was the original factory fitted).

 

I could see water sitting on the glass side in the corners. I was hoping to mask everything off, open the seal a little and then introduce some sealant.

 

Sealing should be done between glass & rubber & body & rubber.

 

That's as maybe, but did the restorers look in the scuttle vent chamber. As I remember, it's formed from two pressings with a vertical welded seam.

 

Is this a badly fitted rubber?

Is this a badly fitted rubber?

Does this look right?

 

The joint clip is obviously wrong. The bottom corners are typically pulled in - not ideal. If you pull back the rubber from the glass or body is sealant present? I see little sign of it but it might be an ultra neat job.

 

I can’t see any sealant. I assume the clip should go over the rubber.

 

The clip should be neatly under the rubber screen side & over the rubber body side.. Apply sealant as shown in the diagram.

 

Refresh page ~ correction

 

Blown up from far larger picture.