My nearside light cluster has water in it.

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Pele no2
Joined: Tue 20 Feb, 2018 21:21
Posts: 4

  Z3 roadster 1.9i

My nearside light cluster has water in it.

Post by Pele no2 » Sun 24 Feb, 2019 18:24

Hi, my 2001 z3 unfortunately has to stop out over the winter. I have just recently noticed water in the nearside rear light. It looks like it maybe comes in when running down the side of the boot and do I take it a gasket has given up and it’s getting in there?

Thanks, Mark.

Mike Fishwick
Joined: Fri 19 Jun, 2009 11:27
Posts: 2013

  Z3 roadster 2.8
Location: Daglan, France

Re: My nearside light cluster has water in it.

Post by Mike Fishwick » Mon 25 Feb, 2019 09:46

Take the light cluster off and use your powers of deduction! I think you will find that the lens is glued to the body, so look for an area showing signs of algie etc. Perhaps you will be able to dribble a bit of Araldite onto the back of the faulty area through the bulb hole.
A Z3 is not just for Christmas - it's for life!

LaRy
Joined: Mon 12 Nov, 2018 17:47
Posts: 14

  Z3 roadster 2.8

Re: My nearside light cluster has water in it.

Post by LaRy » Mon 25 Feb, 2019 21:41

Hi, I had similar problems with my old Volvo 740. Same technical design, water is supposed to flow over the rear light. I suggest that you take out all light bulbs and remove the rear light. Put a heater fan (or a hairdryer) in front of the holes for the bulbs. Keep a good distance, avoid melting the plastic. Better to dry for 2 hours than melting plastic.
Probably the rubber gasket is poor. Buy a bottle of spray wax, the kind of wax you use for rust protection of cars. Spray or paint a thick layer on the rubber gasket, and reassemble the light. It helped on my old Volvo. Vax is better than silicone, because it will be easy to remove the rear light again, if needed.

LaRy
Joined: Mon 12 Nov, 2018 17:47
Posts: 14

  Z3 roadster 2.8

Re: My nearside light cluster has water in it.

Post by LaRy » Tue 26 Feb, 2019 08:06

To make it clear:
You should use the White/transparent real wax, used for the rust protection, often used on the side sills to be applied straight on the paint. Not any "dirty dark brown / black stuff"

Pele no2
Joined: Tue 20 Feb, 2018 21:21
Posts: 4

  Z3 roadster 1.9i

Re: My nearside light cluster has water in it.

Post by Pele no2 » Tue 26 Feb, 2019 17:24

Thanks for the advice, I’ll take off the unit this weekend and have a close inspection.👍

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dazthephot
Joined: Wed 09 Apr, 2008 19:58
Posts: 166

  Z3 roadster 1.9i
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Re: My nearside light cluster has water in it.

Post by dazthephot » Wed 03 Apr, 2019 21:22

Don’t know if you’ve done it already but I had the same problem with both rear light clusters. The unit is held against the rear body with a couple of bolts. In between is a sponge gasket that held in with double sided sticky which comes unglued. I took mine off and dried it all out then just used a small bead of silicon sealant and bolted it back on. Once dried it has been fine for two winters. You could buy new sponge gaskets if you prefer but I’m a firm believer in repair not replace. When I can.


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LaRy
Joined: Mon 12 Nov, 2018 17:47
Posts: 14

  Z3 roadster 2.8

Re: My nearside light cluster has water in it.

Post by LaRy » Thu 04 Apr, 2019 07:50

Dazthephot is suggesting the same solution for the problem, but using silicone sealant. I prefer, as I wrote, white/transparent rust protection wax, because this will make it possible to remove the cluster rather easily, if needed. Maybe the case will be that you buy a new gasket, then the wax can easily be removed by solvent.

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dazthephot
Joined: Wed 09 Apr, 2008 19:58
Posts: 166

  Z3 roadster 1.9i
Contact:

Re: My nearside light cluster has water in it.

Post by dazthephot » Thu 04 Apr, 2019 10:10

LaRy wrote:
Thu 04 Apr, 2019 07:50
Dazthephot is suggesting the same solution for the problem, but using silicone sealant. I prefer, as I wrote, white/transparent rust protection wax, because this will make it possible to remove the cluster rather easily, if needed. Maybe the case will be that you buy a new gasket, then the wax can easily be removed by solvent.
My theory was that because it's fitted as a seal and not really removable that's why i chose a thing bead of silicon which is easily removed but you're right for future serviceability the wax is a good choice. Mine was so bad that water running down the upper boot drainage channel was actually filling up the cluster and pouring into the boot adding to my existing problems of the third brake light poor seal. Once i'd sorted these two issues i've had a completely dry boot even in the heaviest of rain falls. :)

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