Cleaning an MKP Rooflight

Discussion in 'Tech/Mech General' started by John Laidler, Aug 18, 2015.

  1. John Laidler

    John Laidler Funster

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    Out toilet compartment has a rooflight which even over just a couple of years has become pretty dirty. It's not anything we do in there, honest, the problem is it is double glazed but by the most useless double glazing company because there is a gap all round the edge into which dust is blown and settles between the two bits of clear plastic. The problem is compounded because it is not possible to clean between the two bits without several tools and a pair of high step ladders or a ladder.

    Assuming you have these tools here is how to take it apart for cleaning.

    Note: These are the tools which worked on ours - yours may be different and the whole design might be different too. Our window has an opening of 400 by 400 and the top is smooth. Some are quite angular and the method described may not work on yours!

    With a T10 Torx screwdriver remove the 4 self-tapping screws on which the roof mechanism pivots.

    P8180002.jpg

    When you have removed them all, the arms can be lifted off and swung out of the way.

    P8180004.jpg

    In a perfect world the rooflight could be retracted through the opening - it can't! So push it up and ensure it is free of the opening.

    P8180005.jpg

    Now dig out those tall steps or a ladder, or if you have very good balance a tall pair of stilts, and get up there.

    P8180007.jpg

    Without falling off your elevating tool of choice, grab the rooflight.

    P8180008.jpg

    Note hard to reach dirt around the edge of the rooflight. Discuss with wife at this point who is going to clean it. After discussion go and get sponge and bucket.

    Afterwards, retire to somewhere you can put the rooflight down upside down without scratching it.

    Now the slightly tricky bit. You need a T25 Torx screwdriver. Do not be tempted to bodge it with the wrong tool, the screws can be in very tight and I have heard of folk giving up at this point.

    I only had a cheap socket set but with a bit of effort they could be loosened. A bit of sandpaper or the like scrunched up and put in the socket so the T25 bit protrudes more than normal helps it grip the screw better as you can put some downward force on it.

    P8180017.jpg

    "Hold on" I hear you say, "mine doesn't look like that, there is a black plastic bit in the way." And indeed there is. This bit.

    P8180012.jpg

    Not a great photo as you can't see the bottom of it but if you could you would see the socket I was using wouldn't fit because the black plastic bit was in the way. If you have a proper T25 Torx screwdriver, as I had for the T10 size, you probably don't need to do the next bit but if you don't have the proper tools this is the trick.

    P8180013.jpg

    With a small screw driver lever up the little bit of plastic on the right and pull the black plastic bit towards you at the same time. (Compare the two photographs above to see the difference - but no prizes for spotting it, this isn't a competition) Do the same on the other side and then pull the whole bit away - it has two springs on the back but they were captive. They may not be on yours so don't blame me if the go "ping" and disappear down a mouse hole. Just take things carefully and doing it when the plastic is warm so there is less chance of breakage due to it being brittle would be sensible.

    And that is it. When all four T25 screws have been removed the two parts of the rooflight will come apart and you can then take them and give them a good wash in the bath - they were too big for the kitchen sink.

    When reassembling, and mindful the T25 screws can get seized I thoroughly dried the inside of the little pillars with a hair-drier. This will hopefully ensure the screws do not corrode and expand. In hindsight I think you would be wise to replace the T25 screws before washing the upper bit to reduce the amount of water getting in.

    Reassembly was, as they say a reverse of disassembly, the only small trick was when replacing the arms on the T10 pillars pull the handle down just a fraction so the arms rotate enough to slip on past the stop which is moulded onto the pillar.
     
    Last edited: Aug 18, 2015
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  2. Lenny HB

    Lenny HB Funster

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    Last van had one of them used to do it every 18 months or so, very easy when you know how and have the right tools.

    It would be helpful to others if you posted in the Resources section.
     
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  3. Yorick

    Yorick Funster

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    I just use a ladder and climb up and clean from outside :)
     
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  4. John Laidler

    John Laidler Funster

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    Ah, but is it not double glazed? I think some of them are also opaque so it wouldn't matter, but ours is clear so the gunk was visible and looked grubby.
     
  5. Lenny HB

    Lenny HB Funster

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    Ours was opaque & double glazed still looked dreadful with the muck between the two layers.
     
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  6. injebreck99

    injebreck99 Funster

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    We have the same problem on our Bolero, although it is a 280mm model, we also had rain leaking in underneath the vent cover even when it was closed, but it had to be medium rain with the wind in a certain direction, made up a rubber seal to stop it happening again!
     
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  7. Forestboy

    Forestboy Funster Life Member

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    We have a similar roof light in our bathroom and it gets filthy with road grime poxy idea.
    Use a piece of plastic hose with a pipe cleaner brush head gaffa taped on, wrap a cloth or bleachy wipe on the brush head and hey presto clean roof light. Still a PITA job but possible without having to strip the unit down.
     
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  8. injebreck99

    injebreck99 Funster

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    But it the inner glazing becoming dirty on ours.
     
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  9. Forestboy

    Forestboy Funster Life Member

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    Same on ours the pipe n brush goes in the cavity between the glazing and is flexible enough with some fiddling to clean it.
     
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  10. injebreck99

    injebreck99 Funster

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    Must try that.
     
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  11. John Laidler

    John Laidler Funster

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    Just done that, thanks for the suggestion.:)
     
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