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Old 20th July 2019, 14:08   #1
Yorkshire GOC
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Default Passenger side tail light moisture ingress

Hello,

I seem to have moisture/condensation in the tail light only on the white/clear plastic - the red is fine. The casing of the light seems bone dry - so has anyone had similar and where is the moisture coming from.
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Old 21st July 2019, 10:20   #2
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Logically, it's getting inside via the dodgy foam gasket. The probable reason why the 'white' lens fogs and the red one doesn't is their slightly different interior temperatures. This is due to the rate of heat transfer through the light/colourless plastic compared with the dark plastic. Maybe time get some new seals?


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Old 21st July 2019, 10:31   #3
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Quote:
Originally Posted by T-Cut View Post
Logically, it's getting inside via the dodgy foam gasket. The probable reason why the 'white' lens fogs and the red one doesn't is their slightly different interior temperatures. This is due to the rate of heat transfer through the light/colourless plastic compared with the dark plastic. Maybe time get some new seals?


TC
I did think it would be a failing seal - but for the life of me i could not find a rear light cluster gasket on Rimmers?? Will look again
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She came off the Longbridge Line on 20-05-2003

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Old 21st July 2019, 13:27   #4
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Quote:
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- - - I could not find a rear light cluster gasket on Rimmers??
Try this sticky thread on the General Forum: https://the75andztclub.co.uk/forum/s...d.php?t=142690

Everyone here gets them from there.

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Old 21st July 2019, 14:19   #5
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Originally Posted by T-Cut View Post
Try this sticky thread on the General Forum: https://the75andztclub.co.uk/forum/s...d.php?t=142690

Everyone here gets them from there.

TC
Thank you T-Cut but i think that's for saloon rear light clusters - looking at the Rimmers schematic for a rear light cluster on a Tourer i don't think there is a gasket ?
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She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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Old 21st July 2019, 16:02   #6
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Sorry I didn't spot it's a tourer. No, they don't use a gasket. I believe the lamps are 'sealed' units which should be weatherproof. So, a failed joint/crack in the plastic case or a leaky bulb-holder is what to look for. I know the tourer lamp cases tend to fracture around the mounting lugs for the screws, so maybe check those?


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