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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc

408 (and others?) Wiper motor, washers and switch questions.

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Old 10-04-21, 12:16 PM
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Default 408 (and others?) Wiper motor, washers and switch questions.

The previous owner never took the car out in the rain. When I got it the wiper switch was frozen in the 'Off' position and the vacuum-powered original washer system disconnected.

I have freed up the wiper switch but have not actually tried the switch with power on to see if the wipers work because I am currently focused on the washer system. The original vacuum-powered system is ingenious and elegant but I am opting to leave the vacuum disconnected and have installed an electric pump using the original reservoir. This is partly because the switch doesn't push itself out again after being pushed to operate the washers and partly because I just don't want to risk vacuum leaks..

So, a few questions. I have looked in the spares books online and it seems the wiper motor is probably a Lucas DR3. Is that right? I gather that it needs to be paired with an appropriate Lucas switch for the park feature to work. It appears to be something to do with how the switch is wired internally. I'd like to install a switch to replace the original wiper/washer switch with the same look and functions - i.e. rotary, two wiper speeds and push for washer except the washer push needs to be electrical. Has anybody else done this and can advise me on a suitable switch. Looking around the internet it seems that Land Rover Series IIA and III may be a suitable source like this one:
https://www.roversnorth.com/parts/pl...h_2_spd_series

Thanks

David
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Old 10-04-21, 07:54 PM
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I think one of the Rovers from the '60s or '70s had a suitable 2 speed switch with push for wash. It had a hex shaft with a sprung pip to retain it. If it helps anyone remember the model of Rover, the knob was a dark translucent green.
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Old 11-04-21, 12:57 PM
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Looks very possible judging by the number of connectors on the back. I believe the original switch bore the Lucas number 31847 or, on the 410, 31847A which added the electrical push to wash facility. Mind you Iím a bit surprised that landrovers of any vintage used the same wiper motors and switches as Bristols, RR, Alvis, Rover etc so it might be worth checking that it is indeed a substitute before you part with all those dollars.

Roger
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Old 11-04-21, 07:41 PM
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Thanks, gentlemen.

I managed to get a camera behind the wiper motor today. It's apparently a Lucas 6W. Here's a photo.

Also, it looks like the vacuum switch part of the wiper switch is screwed on and was, in later years, replaced with a screwed on electric push switch. I have found one of the electric switches on eBay and will see if I can fit it in place of the vacuum one.

David
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Old 21-04-21, 01:32 PM
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Quote:
Originally Posted by PEU186F View Post
Looks very possible judging by the number of connectors on the back. I believe the original switch bore the Lucas number 31847 or, on the 410, 31847A which added the electrical push to wash facility. Mind you Iím a bit surprised that landrovers of any vintage used the same wiper motors and switches as Bristols, RR, Alvis, Rover etc so it might be worth checking that it is indeed a substitute before you part with all those dollars.

Roger
Roger, I am now stalled again. I managed to remove the vacuum valve from the back of my wiper switch and I also managed buy the exact NOS electrical push switch that Lucas fitted on the later cars.

BUT, the threads in the female mounting point on the back of the wiper switch and the male threads on the small pushbutton electrical washer switch do not match. Looking at photos on the web, I can now see there's a small adapter fitted to join these two and the chances of me finding that adapter must be about nil.

So meanwhile, the washers are being operated from a small push button I mounted below the dash while I decide what to do next.

David
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