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RV8 aircon vacuum valve

Postby Derek Squires » 28 Oct 2016 18:30

The rubber diaphragm has perished and split in the heater cut-off flap vacuum actuator on my RV8. Does anyone have one that they've removed while taking aircon out of their car and would be willing to sell to me?
Alternatively, has anyone had and solved this problem, as the actuators are no longer obtainable.
(It's the black unit that sits in front of the heater box under the bonnet and moves a lever to shut off the normal airflow when aircon is selected, with 'ACTS Ltd 01685' moulded on it).
Derek Squires
 
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Re: RV8 aircon vacuum valve

Postby Gavin Brown » 30 Oct 2016 00:35

Somebody who repairs distributors might be able to replace the diaphram in it for you. The other option is to superglue the crack up, I have done this before.
Gavin Brown
 
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Re: RV8 aircon vacuum valve

Postby Derek Squires » 01 Nov 2016 20:35

Thanks Gavin. The superglue option had crossed my mind, so if you've done it successfully I'll give it a try!
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Re: RV8 aircon vacuum valve

Postby Derek Squires » 11 Jan 2017 12:39

Further to this discussion, I can now confirm that the vacuum actuator on the RV8 is the same unit as RTC 6696 Heater Blower Vacuum Actuator Range Rover Classic & Discovery 1 '86 - '91, which is readily available from Land Rover specialists and on eBay. The only difference is the metal push-rod which is a difference length and shape, so that needs to be swapped with the one from the RV8, both of them are held in place by a circlip.
Derek Squires
 
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Re: RV8 aircon vacuum valve

Postby Gavin Brown » 14 Jan 2017 22:46

Derek Squires wrote:
> Further to this discussion, I can now confirm that the vacuum actuator on
> the RV8 is the same unit as RTC 6696 Heater Blower Vacuum Actuator Range
> Rover Classic & Discovery 1 '86 - '91, which is readily available from
> Land Rover specialists and on eBay. The only difference is the metal
> push-rod which is a difference length and shape, so that needs to be
> swapped with the one from the RV8, both of them are held in place by a
> circlip.

Good info, thanks.
Gavin Brown
 
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Re: RV8 aircon vacuum valve

Postby Anthony David Marchington » 23 Jun 2017 13:23

Fine to repair with Superglue, but how do I open valve to get ay diaphtagm?
Anthony David Marchington
 
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Re: RV8 aircon vacuum valve

Postby Gavin Brown » 25 Jun 2017 02:30

Anthony David Marchington wrote:
> Fine to repair with Superglue, but how do I open valve to get ay diaphtagm?

It is split in the middle where the ridge is.
Gavin Brown
 
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Re: RV8 aircon vacuum valve

Postby Victor Smith » 25 Jun 2017 10:36

Anthony,
I am not sure if you have been able to refer to a copy of the RV8 Repair Manual AKM7144 but I attach an extract on the Vacuum Solenoid Valve (Air conditioning: Page 8 - Repairs) together with a copy of the index page to the section of the manual on air conditioning. A full set of the manuals for the RV8 is available on a CD from Brown & Gammons, details are on the V8 Website via the Technical Support button in the main bar of grey rollover buttons available on most core webpages.
http://www.v8register.net/subpages/Band ... infoCD.htm

Update on 160626
Derek Squires has been in touch to say "good note, but the wrong picture. The solenoid valve is a different unit, mounted on the firewall, that controls the vacuum valves. There are two vacuum valves, one inside the heater box (as in your illustration, which MAY be the same unit?), but the one in question is mounted on top of the heater box assembly and there is no dismantling needed to get to it. I’ve had two fail in nine years, so they are a problem.

There is no one place for the Superglue as the diaphragm can split in different places. Mine had split around the outside edge on two sides for about a quarter of the circumference and the rubber was too perished to glue, which is why I sourced the replacement part instead. If it was just a small split, then it would be Superglue along the torn edge wherever the split is.

Regarding the question about opening it, as Gavin says, it splits in two haves at the ridge around the centre and the two halves are just a very tight push fit together (with a shallow groove on one part and a raised ridge on the other that clicks into it), the two halves trapping a lip around the outside of the rubber diaphragm to locate it firmly in place.

I’m in the UK at the moment, for ten days, but I’m sure that I still have the old unit in my garage in Spain so I could send you a photo of it dismantled to put on your note before you publish it when I get back".

The first screengrab below from the RV8 Repair Manual AKM7144 is from "Repairs page 9" which I think is the correct one for this thread. When he is back home, Derek's photo of the diaphragm will clarify this thread for many of us. BTW Derek's mention above of "your note" is to a draft RV8NOTE we are preparing based on this thread with photos to illustrate the case better so even if you do not undertake the work yourself you will at least be able to understand what's involved and where the part can be found on the RV8.
Attachments
RV8-Repair-Manual-AKM7144-arcon-vacuum-actuator.jpg
RV8-Repair-Manual-AKM7144-arcon-valve.jpg
RV8-Repair-Manual-AKM7144-arcon-index.jpg
Victor Smith
 
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Re: RV8 aircon vacuum valve

Postby Anthony David Marchington » 26 Jun 2017 19:22

Managed to open the valve and find that flange and body have completely separated. I have this evening tried to "Superglue" body to flange and see how it works. If not I'll go to local Landrover Agents and get a replacement. I live in France and presume getting a Landrover part will be no problem. Tackling the one on the heater casing was no problem but I am not looking forward to tackling the other one on the aircon distribution box which will mean having to remove the dashboard!! I have the RV8 Repair Manual which I have found invaluable.
Thanks for the responses which I found most useful.
Anthony David Marchington
 
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Re: RV8 aircon vacuum valve

Postby Gavin Brown » 26 Jun 2017 20:42

Anthony,
You didn't Superglue the two halves together did you? You have to Superglue the split in the rubber diaphragm.
Gavin Brown
 
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