Loose "12V" Doohickey Inserted into Air Cleaner Box
#1
Loose "12V" Doohickey Inserted into Air Cleaner Box
I'm not sure what this is. I've looked at Haynes and the ROM without success, probably as I'm not sure where I'm supposed to be looking (nothing under "air cleaner" at any rate). It just sits in a hole in the RH cleaner box ( RH = looking from cabin to front) and looks as if it's suppose to be wedged or fastened or something, but isn't. I'm assuming it's something electrical due to the "12V" label.
Any clue what I'm looking at, and whether this is a problem, would be much appreciated.
Mystery object of great mystery. Front of car to left.
It just sits in there happily. Or perhaps not so happily, which is what concerns me.
It just pulls out - it's just sitting there.
Any clue what I'm looking at, and whether this is a problem, would be much appreciated.
Mystery object of great mystery. Front of car to left.
It just sits in there happily. Or perhaps not so happily, which is what concerns me.
It just pulls out - it's just sitting there.
#2
It's missing the rubber grommet, no biggie, just get another, you can buy inexpensive grommet sets at most automotive and hardware stores.
https://www.jaguarforums.com/forum/x...ication-88929/
https://www.jaguarforums.com/forum/x...ication-88929/
Last edited by JTsmks; 07-19-2016 at 10:39 PM.
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Some Day, Some Day (07-19-2016)
#3
#4
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Extra Air Valve, Supplemental Air Valve, and perhaps another name which escapes my memory.
It opens to admit more air and thus increase idle speed.
Over the many years there were 2 or 3 somewhat varied schemes for operation but, most typically, it is tied into the a/c compressor circuit.
Cheers
DD
It opens to admit more air and thus increase idle speed.
Over the many years there were 2 or 3 somewhat varied schemes for operation but, most typically, it is tied into the a/c compressor circuit.
Cheers
DD
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Some Day, Some Day (07-19-2016)
#5
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#8
Actually, looking at Kirby Palm's pic, it appears to be facing the right direction. The arrow points out.
Jaguar V12 Supplementary Air Valve
Jaguar V12 Supplementary Air Valve
#9
As Doug says it's an additional air valve, purpose is to raise idle speed slightly to compensate for extra load if air conditioning compressor.
Switched by air con it bleeds extra air into manifold .
Others with more experience tell me its function is less needed with later Sanden compressor due to less load
Switched by air con it bleeds extra air into manifold .
Others with more experience tell me its function is less needed with later Sanden compressor due to less load
#10
As Doug said, it is to increase the tickover speed of the engine when the aircon compressor kicks in, thus preventing a stall. It IS facing the RIGHT way When it opens it takes filtered air from the airbox, bypasses the throttle butterfly and admits it under the throttle body, just inside the butterfly. Inset a new grommet to stop it rattling about and prevent unfiltered air entering the engine.
Greg
Greg
#11
Thanks very much everyone. Now that I know what it is...
...I have just discovered that the hose leading from it to underneath the exhaust manifold has completed sheered in two. I'm sure it wasn't like that yesterday. I have also lost the cap to the yellow plastic filler opening at the right front of the engine (not sure what it is: it vanishes into the right wing right by the front of the engine bay), so put some tin foil over it to keep anything out, and will get it replaced when I get the car looked at tomorrow.
If it's not that vital, can I drive the car as far as the car repair place (15-20 mins?) with a severed aux. air valve hose, perhaps wrapping the severed ends in tinfoil so they don't rest directly on the engine?
...I have just discovered that the hose leading from it to underneath the exhaust manifold has completed sheered in two. I'm sure it wasn't like that yesterday. I have also lost the cap to the yellow plastic filler opening at the right front of the engine (not sure what it is: it vanishes into the right wing right by the front of the engine bay), so put some tin foil over it to keep anything out, and will get it replaced when I get the car looked at tomorrow.
If it's not that vital, can I drive the car as far as the car repair place (15-20 mins?) with a severed aux. air valve hose, perhaps wrapping the severed ends in tinfoil so they don't rest directly on the engine?
#12
Thanks very much everyone. Now that I know what it is...
...I have just discovered that the hose leading from it to underneath the exhaust manifold has completed sheered in two. I'm sure it wasn't like that yesterday. I have also lost the cap to the yellow plastic filler opening at the right front of the engine (not sure what it is: it vanishes into the right wing right by the front of the engine bay), so put some tin foil over it to keep anything out, and will get it replaced when I get the car looked at tomorrow.
If it's not that vital, can I drive the car as far as the car repair place (15-20 mins?) with a severed aux. air valve hose, perhaps wrapping the severed ends in tinfoil so they don't rest directly on the engine?
...I have just discovered that the hose leading from it to underneath the exhaust manifold has completed sheered in two. I'm sure it wasn't like that yesterday. I have also lost the cap to the yellow plastic filler opening at the right front of the engine (not sure what it is: it vanishes into the right wing right by the front of the engine bay), so put some tin foil over it to keep anything out, and will get it replaced when I get the car looked at tomorrow.
If it's not that vital, can I drive the car as far as the car repair place (15-20 mins?) with a severed aux. air valve hose, perhaps wrapping the severed ends in tinfoil so they don't rest directly on the engine?
However, there is a warning in this find. You can be 100% sure that ALL the rubber hoses are pretty cooked in the engine bay, and possibly parts of the electrical loom. When you get the radiator cleaned/fixed/renewed, and the thermostats changed, ensure that ALL the other rubber coolant hose are also changed, there are LOTS of them and they are hard to get at. If not, at the worst possible moment one will let go!
Greg
#13
Thanks Greg. The shop guy said they had been replacing some hoses when going over the engine prior to handing it over, but I'm not too sure if that really happened or which were replaced. I've checked manually for softness, and didn't see any problems, but clearly missed this one. However, you're right of course, and I will ask the people doing the rad to do the hoses as well.
I see people saying the new black fan is better than the old yellow fan too. Perhaps I should order one from the UK while the pound is low....
I see people saying the new black fan is better than the old yellow fan too. Perhaps I should order one from the UK while the pound is low....
#14
Just a quick note on this air valve. I replaced mine with the adjustable rpm one like Kirby used in "The Book" . This was a great cheap improvement when rpm and AC working together come into the subject. This is particularly involved when a manual transmission conversion comes into play .
Lawrence
Lawrence
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Greg in France (07-20-2016)
#15
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#18
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Greg in France (07-21-2016)
#19
Doing a web search type in Nippondenso 084600-5510 scroll down to V12 supplementary air valve . This part number will only give a picture and great info about the Toyota part I used and the stock "12V" air valve. At some point we will find what model, year & part # this Toyota air valve came with.
Lawrence
Lawrence
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Greg in France (07-21-2016)
#20
I think that was the first repair.... and I had a box of assorted grommets so I just found one that fit snug....
they do fall out on occasion and the grommet stays on the device...
you got to have a look at it monthly...
I was thinking of sealing the hole and buying one of the cute air filters for the device
Last edited by Jonathan-W; 07-22-2016 at 12:34 PM.