| Author | Message | ||
     Vladimir Ivanovich Kirillov Grand Master Username: soviet Post Number: 1311 Registered: 2-2013 |
This specialised tool illustrated in the workshop manual is rare and quite expensive to purchase if you can locate one at any RR/B parts supplier internationally. Thanks to this forum and Brian Vogel's PMs to me I managed to hunt down a gentleman in California who makes them from scratch and who being rather generous is sending one I purchased with the wiring diagram and photos of its internals to allow other custodians to make their own AC test boxes. I shall post the wiring diagram when I get it. You will notice looking at the manual that there is a significant amount of tests and procedure to wade through to diagnosis and calibrate and adjust the complex AC unit in your cars. I felt that putting either my Camargue or Spirit into the local or indeed any non specialist RR/B AC repair shop and requesting diagnosis and repair spelt impeding financial disaster. PM me for contact details of the hard to locate manufacturer of these new RR/B AC Test Boxes if you wish. | ||
| Robert J. Sprauer Prolific User Username: wraithman Post Number: 153 Registered: 11-2017 |
Vlad I may have seen the buyer post one of his creations on eBay some time back and he offered a couple of finishes for the case? I would definitely be interested in the diagram to fabricate one since I have the know how to do so. Looking forward. Thanks for the offer! | ||
| Peter Maclaren Experienced User Username: ludo Post Number: 44 Registered: 4-2009 |
Look forward to this too, as all the info available for testing relates to the use of the testbox. I have had the compressor on my Bentley replaced recently but there are ongoing problems with the flap controls and as Vlad says giving it to an expert is likely to cause 'financial disaster' | ||
| Brian Vogel Grand Master Username: guyslp Post Number: 2780 Registered: 6-2009 |
Not trying to nitpick, but how far into the SZ series cars does this device go? I'm familiar with its function for the SY AC system, but I thought that system changed pretty significantly in terms of diagnostics once Mastercheck and the other electronics crept in. Always useful to have the model year bracketing for the device. Brian | ||
| Robert J. Sprauer Prolific User Username: wraithman Post Number: 154 Registered: 11-2017 |
Brian, From what I know it is good up to late 1987 and therefore test box RH9884 is needed from there. | ||
| Jim Walters Prolific User Username: jim_walters Post Number: 217 Registered: 1-2014 |
I have both test boxes as well as the Mastercheck. The RH8851 is used from 1977 to 87, up to VIN 20,000. VIN's greater than 20K require the RH 9884 test box which is used up to the 1998 model year. Mastercheck does not have data cards to diagnose the ACU system. SRH8505 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com | ||
| Vladimir Ivanovich Kirillov Grand Master Username: soviet Post Number: 1314 Registered: 2-2013 |
Thanks Robert and Jim, I would have been really pushed to answer Brian's question and only had a fuzzy notion that it would be useful on all AC Units that were the same as the split system first tested on fitted on the Camargue. I intend to use HyChill gas which does not require a Soviet style procedure to obtain like R134A and as its flammable have a gas detector sniffing constantly.(If you don't hear from me its because JRH 23682 has exploded with me in it) Mr Yorke in the UK once said that there is a lot one can do on the AC without the test box. I am quite excited about trying my hand at this caper. The AC compressor on my purple 82 Spirit looks identical the my 76 Cadillac so as I am ripping the computerised fuel injection violently out of the Cadillac and fitting a Holley carburettor on it, the Spirits compressor having knackered bearings will gain a transplant. This could be interesting and dangerous - I like it. | ||
| Brian Vogel Grand Master Username: guyslp Post Number: 2781 Registered: 6-2009 |
Thanks for the bracketing clarifications with regard to both RH8851 (1977-1987) and RH9984 (1988-1998). I knew that there was definitely something beyond the RH8851 ACU Test Box, but I'll be darned if I could remember what, exactly. There's been a lot of water that's passed under my RR-Bentley knowledge bridge, and since I've never owned an SZ series car that knowledge gets muddy faster. Brian | ||
| David Gore Moderator Username: david_gore Post Number: 3172 Registered: 4-2003 |
Vladimir, You are more at risk when you carry a 9kg barbecue LPG cylinder in a Silver Spirit than one with less than half a kilogram of Hychill -30 in its A/C system. Just click on the R-R model listed in the following link for the Hychill -30 charge weights: https://hychill.com.au/info/chargeweights/Rolls-Royce . | ||
| David Gore Moderator Username: david_gore Post Number: 3176 Registered: 4-2003 |
Vladimir has sent me the following photo of the test box for me to edit and post on his behalf:   | ||
| Robert J. Sprauer Prolific User Username: wraithman Post Number: 161 Registered: 11-2017 |
Thanks David. Can't wait for the circuit diagram to fab one of these. | ||
| David Gore Moderator Username: david_gore Post Number: 3177 Registered: 4-2003 |
Our "Roving Russian" has been a busy boy....... Internal view of test box..................... A proper circuit diagram is in transit right now hopefully not doing part of its journey on a Boeing 737Max.  | ||
| Vladimir Ivanovich Kirillov Grand Master Username: soviet Post Number: 1319 Registered: 2-2013 |
When the test box arrives it will also contain a list of the components together hopefully with a good techical wiring diagram. | ||
| Robert J. Sprauer Prolific User Username: wraithman Post Number: 163 Registered: 11-2017 |
Thanks Vlad. It's so nice of you to share, that's what good club members do..helping others. | ||
| David Gore Moderator Username: david_gore Post Number: 3378 Registered: 04-2003 |
Vladimir, I had a NSW RROCA member contact me yesterday regarding the RH8851 test box. Would you please text me the best times for me to call you and discuss further. I will have to go to a good mobile phone signal strength location to call you as I am having no end of difficulties at present. Regards David | ||
| Vladimir Ivanovich Kirillov Prolific User Username: soviet Post Number: 1513 Registered: 02-2013 |
David you are most welcome to call me at anytime convenient to yourself mate. I am a fully blown insomniac and it's rare for me to sleep any more than 2 to 4 hours unless I have a full carton of heavy beer and that only produces 5 hours of sleep. So call whenever you wish. | ||
| NilesHanson Unregistered guest |
This string seems to have abruptly ended. Is there anyone still active on this issue? I find I need a RH9884 test unit (VIN21302) to work out problematic AC control. I think the information above regarding the availability of schematics and the images are for the RH8851 device. Flying Spares presented a used RH9884 for sale and I entered an order, but they have now reported it is not available. The image they show for RH9884 seems a bit more complex than the RH9851. Are schematics available for the RH9884? (Message approved by david_gore) | ||
| David Gore Moderator Username: david_gore Post Number: 4279 Registered: 04-2003 |
Niles, The contributors to this thread are no longer active on this forum. We need someone who is knowledgeable about these test units to respond and hopefully provide more information about this device. | ||
| Jim Walters Frequent User Username: jim_walters Post Number: 392 Registered: 01-2014 |
Niles, what problems are you having? There are a few known failures in the later system that can be diagnosed without the aid of the test box. If you explain what the issues are and what you have done to try and fix it I'll try to help. SRH8505 LRB15211 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com | ||
| David Gore Moderator Username: david_gore Post Number: 4280 Registered: 04-2003 |
Jim, Thank you for your kind offer of assistance. You are a great example of someone willing and able to help with advice when needed. I hope the problem is one that can be diagnosed and solved without requiring specialised test equipment. | ||
| Jim Walters Frequent User Username: jim_walters Post Number: 393 Registered: 01-2014 |
Thanks David, I'm a helpful kind of guy paying it forward. Niles, does anything happen when the engine is warmed up and you turn the selector switch to "defrost"? SRH8505 LRB15211 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com | ||
| Niles Hanson Yet to post message Username: nileseh Post Number: 1 Registered: 11-2024 |
Well, I tried to get something in as a guest, but it didn't happen so now I'm registered so i'll try again. I rented the RH9884 test box from Flying Spares, but reference to TSD4700 Chapter 3,Page C4-1 suggests that it is not applicable to the Corniche II. I'd like to sort that out before I plug anything in and have an unfortunate adventure in incompatible electronics. My car is a 1987 Corniche II s/n 21302. Can anyone help with that. The car is new to me; I'm learning much about the previous owner. I checked defrost, nothing warm. So that led to a quick look in the engine compartment. He bypassed the heater matrix rather than fix what ever the problem was. Go figure. I expect a leaky core, but could also have been constant heat because of a stuck valve or controller problem. The car was out of Florida; heat not so much of a priority there as it is in Oregon. I should be able to sort that out if the RD9448 box can be used. In any case, the matrix will need to be checked. I can't find guidance in TSD4700 on how to remove the matrix. I did find that on earlier cars it is removed forward from the engine compartment rather than by removal of the interior. Is that the case on Corniche II as well. I appreciate any help. | ||
| NilesHanson Unregistered guest |
Thanks for the responses. There a couple of things that don't seem to work. The fan speed, even when high is selected is a bit anemic and heat is not forthcoming when the selector is all the way to the red. That leads to another question. I rented the RH4884 From Flying Spares in the UK. However, the Workshop manual TSD4700 indicates that the test procedures, with out the test box, are not applicable to the Corniche II. Can anyone comment on that? I would have thought that the systems are the same. I don't want to plug the box into the car and learn something unfortunate about electronics incompatibility. I also just saw on another forum that the RH4884 is applicable to SZ 1988 on; my car is a 1987 Corniche II VIN 21302. Is this test box going to work on this car in any case? (Message approved by david_gore) |
