Author Topic: WUR Rebuild  (Read 605 times)

Mattr

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WUR Rebuild
« on: 22 July 2019, 06:16 PM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php
1976 450SE 6.9 FrankenBenz (#2288?)
1977 450SEL 6.9 #2333

Lance

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Re: WUR Rebuild
« Reply #1 on: 22 July 2019, 07:35 PM »
Send it to Kjet biz, they did mine for my W123 280E and it was spot on.

daantjie

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Re: WUR Rebuild
« Reply #2 on: 22 July 2019, 08:07 PM »
Larry Fletcher is the go to for this:

http://www.cisflowtech.com/

Daniel
1977 450 SEL 6.9 - Astralsilber

Mattr

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Re: WUR Rebuild
« Reply #3 on: 22 July 2019, 08:44 PM »
Send it to Kjet biz, they did mine for my W123 280E and it was spot on.
I'm in the USA. Shipping one there and back would be brutal. Especially since there's a chance I'll need to do it twice.

Quote from: daantjie
Larry Fletcher is the go to for this:

http://www.cisflowtech.com/

I saw that site. I didn't really see prices, which made me suspect the answer was "astronomical," but I'll give them a call.
1976 450SE 6.9 FrankenBenz (#2288?)
1977 450SEL 6.9 #2333

raueda1

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Re: WUR Rebuild
« Reply #4 on: 22 July 2019, 10:08 PM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php
CISFlowtch rebuilt my WUR last year.  It was about $250, quite reasonable.
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

s class

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Re: WUR Rebuild
« Reply #5 on: 22 July 2019, 10:18 PM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php

That first link is for a double diaphragm kit used on 380, 500 and late 280

For 4.5 and 6.9 you need the single diaphragm kit.

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL

raueda1

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Re: WUR Rebuild
« Reply #6 on: 23 July 2019, 10:40 AM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php

That first link is for a double diaphragm kit used on 380, 500 and late 280

For 4.5 and 6.9 you need the single diaphragm kit.
hmmmm.  Careful here.  I have an early euro 6.9 and it has double diaphragm (steel for fuel pressure and rubber for vac enrichment).  It's also mounted sideways unlike most I've seen.  Point is, there many variants.  Make sure the kit is for your specific P/N.
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

s class

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Re: WUR Rebuild
« Reply #7 on: 23 July 2019, 10:52 AM »
Dave, that's what we mean by single diaphragm... One steel and one rubber.  The double diaphragm units have one steel and TWO rubber diaphragms.

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL

s class

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Re: WUR Rebuild
« Reply #8 on: 23 July 2019, 10:53 AM »
I'll be rebuilding a single diapglhrgm 450 unit tomorrow if the customer accepts the quote.  If it happens, I'll take photos.

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL

Mattr

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Re: WUR Rebuild
« Reply #9 on: 23 July 2019, 01:40 PM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php

That first link is for a double diaphragm kit used on 380, 500 and late 280

For 4.5 and 6.9 you need the single diaphragm kit.

That matches my part number. I also spoke with the guy that runs Salvox (http://salvox.com/products.php?66&cPath=16&sid=f888ba91854818ea0439794196dfc03a) and he said that they don't sell a kit for the double diaphragm because the parts in the 'double sandwich' (as he called it) very rarely goes bad, and that the parts in that kit should be all that needs replacing. I might pick up the kit from Salvox, and see how it goes. Spending $50 and doing it myself sounds vastly more appealing than spending $250 + shipping, but I may re-read the instructions before I commit to that approach.

My Bosch part number, fyi, is 0 438 140 060 (0438140060 , for the sake of people googling/searching this in the future).
1976 450SE 6.9 FrankenBenz (#2288?)
1977 450SEL 6.9 #2333

TJ 450

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Re: WUR Rebuild
« Reply #10 on: 23 July 2019, 10:00 PM »
Interesting,

I recently rebuilt mine (060?) and it has the double diaphragm type unless this is a Euro/ US/Aus difference?

I stuffed up the FD though as it now leaks between halves!

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

s class

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Re: WUR Rebuild
« Reply #11 on: 23 July 2019, 10:38 PM »
Saying the the double rubber diaphragm rarely goes bad is a surprising statement.  It is in fact usually the small round rubber diaphragm in these that fails.  The symptom them is low <1.5BAR control pressure even when warm.  Most aftermarket suppliers of diaphragm kits don't offer the double diaphragm units because they are technically difficult to manufacture.

The double rubber diaphragm wurs are far more prone to problems than the simpler single rubber diaphragm units in 4.5, 6.9 etc

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL

revilla

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Re: WUR Rebuild
« Reply #12 on: 23 July 2019, 11:14 PM »
Hey Folks,

My 6.9 is in need of a WUR rebuild, and since I might be acquiring a second 6.9 (which is also in need of a WUR rebuild), I'm thinking of doing so myself, rather than buying a reman one ($650 is the best price I can find or an unwired kit, which is $550), since that's a ~$90 USD kit from Aussie (link below). This brings me to a question: has anyone gone down this road before? I found a guide for it on a Ferrari website that looks pretty thorough (it's missing a few details, but it's thorough enough I think I can square the rest away), but I thought I'd ask, since maybe there's something really easy to foul up that this guide doesn't mention.

https://k-jet.biz/product/0-438-140-112-warm-up-regulator-double-vacuum-diaphragm-repair-kit/

http://www.ferrari400parts.com/Warmupregulatorrepair.php

That first link is for a double diaphragm kit used on 380, 500 and late 280

For 4.5 and 6.9 you need the single diaphragm kit.

That matches my part number. I also spoke with the guy that runs Salvox (http://salvox.com/products.php?66&cPath=16&sid=f888ba91854818ea0439794196dfc03a) and he said that they don't sell a kit for the double diaphragm because the parts in the 'double sandwich' (as he called it) very rarely goes bad, and that the parts in that kit should be all that needs replacing. I might pick up the kit from Salvox, and see how it goes. Spending $50 and doing it myself sounds vastly more appealing than spending $250 + shipping, but I may re-read the instructions before I commit to that approach.

My Bosch part number, fyi, is 0 438 140 060 (0438140060 , for the sake of people googling/searching this in the future).

Hello there Matt,

Go for it!!!  I did both mine a few years ago using that exact ferrari guide.  They still work like a charm.
Yes of course, you have the option to have the WUR rebuilt by someone else and pay.  But that option is missing 4 points immo.  Firstly, the learning experience.  Doing it yourself will truly help understand how it works and especially how it shouldn't work :).  Second, the self-satisfaction of accomplishing the job with your own hands, with your knowledge.  It's so rewarding when the engine fires up in no time cold or hot weather after the fuel pressures are to spec (assuming accumulator, thermo time sw, pump, lines, mixtures control, injectors, CSV, P regulator, etc are in good shape) and that you have done that yourself.  Then the savings of course, it's much less expensive than paying the labor somewhere else. And finally, but very important, there's a fine-tuning (very fine...) that must be done with the WUR installed in your own car.  The rebuilder might have the WUR redone to Spec, fine, but you have a fuel system with miles on it, with its own tolerances, wear so with its own 'personality' so to speak that the 'new' WUR must 'fit' into the system.  That fine tuning implies tapping over the insert until you reach the sweet spot according to the System Pressure you have (it's adjustable with shims).  I did it with the engine running and pressure gage connected. Bottom line, a rebuilt WUR might or might not give you the desired results even if the rebuilder does it to Spec, there are tolerances.  So doing it yourself has that additional advantage.  It can be a nightmare to pay $200+ to find yourself redoing it anyway to match your system.

In case of questions let us know.
Robert
W116 1977 280SEL & 1979 280SE

TJ 450

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Re: WUR Rebuild
« Reply #13 on: 24 July 2019, 02:01 AM »
The kit in the link IS the correct one for the 060 WUR btw, I just confirmed it is the exact one I used.

Both diaphragms were all crunchy and well past their use-by-date.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

s class

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Re: WUR Rebuild
« Reply #14 on: 24 July 2019, 06:10 AM »
TJ, it is possible that the aus 4.5 and 6.9 used the 2 rubber + 1 stainless diaphragm system.  THat was an advancement introduced by Bosch to improve emissions, mainly by controlling fuelling on the overrun.  It was also adopted for euro models from the W126 series, which is why I mentioned it being applicable to 380 and 500.  Euro 4.5 and 6.9 used the 1 rubber + 1 stainless diaphragm system up to the end of production as far as I know. 

'76 6.9 Euro, '78 6.9 AMG, '80 280SE, '74 350SE, '82 500SEL euro full hydro, '83 500SEL euro full hydro , '81 500SL