Author Topic: Lewmar fixed portlight leaking  (Read 102 times)

umu

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Lewmar fixed portlight leaking
« on: February 13 2019, 14:49 »
On our B37 2006 I noticed a slight leak on the fixed elliptical portlights made by Lewmar (mounted below deck, about 50cm above waterline).
This only happens when going hard to windward for an some time, was not able to reproduce the leak with a water hose.

Anyone got that before and has hints about possible root cause?

Symphony

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Re: Lewmar fixed portlight leaking
« Reply #1 on: February 13 2019, 15:13 »
First you need to determine if the leak is between the frame and the hull or the frame and the glass. No secret about the cause of leaks. Failure of the seal between the faces. Solution is to remove, dismantle and reseal as necessary. Not always easy as suspect that the portlight is glued to the hull.

umu

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Re: Lewmar fixed portlight leaking
« Reply #2 on: February 13 2019, 20:32 »
Thanks Symphony - that's what I tried to figure out with hosing down the portlight. However no leak whatsoever just with water from the hose.

And when sailing hard to windward I can see after a while that it gets wet below the portlight, however no chance to see where exactly it comes from, it seems not to be between the glass and the seal (seal seems dry on the inside), but could be between the seal and the frame or the bedding of the frame or the point where the frame halves meet.

That's why I asked if someone has had a similar pattern and figured what the cause was.



dawntreader

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Re: Lewmar fixed portlight leaking
« Reply #3 on: February 14 2019, 07:04 »
Are you sure it's the side portlight?  ::) I thought mine was leaking too but after detailed investigations found water entry from on top, along the ceiling ridge and down past the portlight. I fixed the leak (roof portlight seal) and the side portlight hasn't leaked since  ;D This may explain why no water entry despite hosing down  :o

Clivert

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Re: Lewmar fixed portlight leaking
« Reply #4 on: February 14 2019, 12:35 »
We had the same problem on our 2001 '34 fitted with Rutgerson opening portlights.
The are bedded on foam seals.
On removing the portlight I found the the seal was not bedded properly, so I simply fitted a new foam seal and problem solved