WUR rebuild instructions
#1
Team Owner
Thread Starter
WUR rebuild instructions
found this on another thread
Instructions for rebuilding the WUR
http://www.ferrari400parts.com/Warmu...atorrepair.php
Instructions for rebuilding the WUR
http://www.ferrari400parts.com/Warmu...atorrepair.php
#3
Yes, very nice find Stan. Thanks
#5
Rennlist Member
Remove the screen. I have seen one with 5 layers of brass, different fineness. Or , remove carefully, and burn the crud off with a lighter, replace. That guy also sells kits of WUR Orings etc, and for the distributor, and replacemnet distributor shims. On a distributor rebuild he advises polishing/truing the half faces on a good flat surface with very fine wet&dry.
jp 83 Euro S AT 54k
jp 83 Euro S AT 54k
#6
Rennlist Member
thanks Stan. good find
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#8
Here are two diagrams (with vacuum and WOT) of the actual insides of a 928 WUR. May be useful for anyone trying to understand how the 928 full throttle enrichment works when the vacuum/air hoses are connected the opposite way around to how they are in all of the bosch documentation.
#9
Vac controlled WUR
Hi Smiffypr
I have been searching all around the net to find what you have posted, i.e. the pictures of the vac controlled WUR. As you correctly mentioned, it is the type that works the opposite way to those described in all known to me Bosch publications. I worked out the principle easily but wanted to find the confirmation either in a correct cross-section diagram of such WUR or picture of one being disassembled
Finally came across your post !
My 911 has WUR just like this one.
Would you be so kind and let me know which Bosch publication you have found it?
I found couple of them in pdf on the net and printed them for an easier use, but none contained that type of WUR.
Would you by any chance have a pdf copy of it?
I could then print it and add to my small collection
Regards
Tom
I have been searching all around the net to find what you have posted, i.e. the pictures of the vac controlled WUR. As you correctly mentioned, it is the type that works the opposite way to those described in all known to me Bosch publications. I worked out the principle easily but wanted to find the confirmation either in a correct cross-section diagram of such WUR or picture of one being disassembled
Finally came across your post !
My 911 has WUR just like this one.
Would you be so kind and let me know which Bosch publication you have found it?
I found couple of them in pdf on the net and printed them for an easier use, but none contained that type of WUR.
Would you by any chance have a pdf copy of it?
I could then print it and add to my small collection
Regards
Tom
#12
Burning Brakes
A couple drops of muratic acid will clean the filter screens very well doesn't seem to bother the WUR at all just flush with water after and let dry. Put some oil on the steel parts right away or it will start to rust.
#13
Rennlist Member
WUR
None of the diagrams I have seen show the heater arrangement in my WUR - an 086 version. It has a set of points in it that look like they cut off the +12V once the engine heat has moved the bimetallic strip.
jp 83 Euro S AT 56k
jp 83 Euro S AT 56k
#14
Nordschleife Master
It makes sense the the upper port gets vacuum. The diagrams that show it show the upper being "atmosphere" and the lower being "vacuum."
How does the upper get more vacuum at WOT? Special ports in the throttle body?
How does the upper get more vacuum at WOT? Special ports in the throttle body?
#15
This WUR has atm. on top and as it has a special sealed chamber for vac. ABOVE the membrane. In the open throttle stage the pressure rises in the inlet manifold and "vac" becomes "less" of a vacuum and the membrane is pushed down as the "air" forces are similar on eitjhr siede of the membrane but the inner spring helps push the membrane down. etc.
Those WURs that have vac. on top do not have a special small chamber ABOVE the membrane.