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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Old Mar 14th, 2018, 15:29   #21
Ron Kwas
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c1800;

Thanks for response, but please look at other questions and try to answer, if only from memory...

I did attack my AAV yesterday with socket and hammer, and got the Bulb Assembly to move (about 0.100"), but not the Insert (this tells me that they were not in contact, and that they were pressed into place as a two-step operation)...I have it soaking in penetrant and will try again today...I dislike impact force of a Hammer (although that is what it might take to get things moving initially)...I might continue with the more gentle and continuous force of a vice or Arbor Press.

Re MPS...a friend of mine did repair his (typical cracked Diaphragm failure) successfully a long time ago...he machined two forming dies and used them in a press to form the bellows shape into a piece of sheet (Brass?...gauge?...he probably just measured gauge of the failed one and used the same for the repair)..unfortunately, those dies are long-gone...good luck with that project...please document this well also...

Cheers
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Old Apr 25th, 2018, 20:07   #22
c1800
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Hi Ron, sorry for the delay, life gets in the way, as we all know..

In any event, I’ll try to answer

“Please confirm: Plunger and Insert are both of Alu (which would explain why Plunger freezes in place).”
Yes, they’re all aluminum

“ While pressing Insert and Bulb into Housing during Assembly/Reassembly, Insert OD indeed presses on Bulb Assy OD , but only to hold it in place...at the same time, Actuator of Bulb Assy presses on Plunger determining its final (thermally dependent) position within Insert...do I have this right?”

If I’m following you correctly, that does sound right.

“If so...I like it...its an inspired, simple, producible design...its only long-term weakness it the darned Alu with when it corrodeds and grows, locks up the function!!”

Agreed, the innards shouldn’t be affected by clean air entering from the air filter, (maybe airborne moisture) but I’m guessing that backfiring of the engine, or vapours in the system after engine shutdown, Find their into the valve and corrode the innards.

Another feature that, at least at this point ~50 years on, is that the thin rod with the 2 adjustment nuts, is useless for adjusting. Obviously they can’t be accessed when the unit is fully assembled, so I can only surmise that during manufacture there was some tool to measure the action of the bulb and apply that to the adjustment.

Let me know if I can help further. I look forward to your how to guide.

Did you hammer a little harder and get yours apart?
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Old May 15th, 2018, 16:06   #23
c1800
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I see VP Autoparts now selling AAV for $450 US!

http://www.vp-autoparts.com/us/main....e&artno=241853
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Old Sep 20th, 2018, 16:55   #24
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I've followed this thread with interest and thank those contributors who provided the method of stripping down a seized Bosch AAV for possible refurbishment.

With a reluctance to (a) wreck my existing valve during dis-assembling without a safety net or (b) spend £400 on a re-manufactured replacement I set about producing a viable working alternative air valve system at low cost.

The attached pdf document gives a description of what I've done and includes a few photographs for clarification. It all works well and doesn't detract too much from the original engine bay appearance.
I've now just got to remove the original seized AAV, fit a blanking plate to the cylinder head and perhaps gently attack the valve for refurbishment. If it fails, at least I have a nice working 'choke' system on my Bosch D Jet for under £50!

Paul
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File Type: pdf Manual Choke.pdf (656.8 KB, 41 views)
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Old Sep 21st, 2018, 13:52   #25
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Interesting. Hope it works out long term. I would have put the choke cable through the adjacent grommet. That way no drilling and reducing the chance of leaks and rusting at the new hole. Choke outer sleeve will probably chafe through but in the meantime, a blob of sealant would be a good idea.
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Old Sep 21st, 2018, 15:46   #26
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Paul;

A cute and ingenious rigger solution!...now if you could make it automatic by incorporating a bi-metalic element to actuate the control...

Anyone who is creative and resourceful enough to come up with that, can surely bang out a block-off plate for the original AAV, but I can offer you one in SS also! Contact me off line.

Cheers
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Old Sep 21st, 2018, 17:27   #27
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Quote:
Originally Posted by Derek UK View Post
Interesting. Hope it works out long term. I would have put the choke cable through the adjacent grommet. That way no drilling and reducing the chance of leaks and rusting at the new hole. Choke outer sleeve will probably chafe through but in the meantime, a blob of sealant would be a good idea.
I actually had a rethink afterwards Derek and I've drilled a slightly larger hole to accommodate a nice new rubber grommet and threaded the outer cable through it.

The reason I didn't route it through the existing lower grommet is that the higher mounting hole I drilled ensures that the cable is in a virtually horizontal straight line from bulkhead to new valve.

Last edited by cassell; Sep 21st, 2018 at 17:34.
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Old Sep 21st, 2018, 21:51   #28
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Quote:
Originally Posted by Ron Kwas View Post
Paul;

A cute and ingenious rigger solution!...now if you could make it automatic by incorporating a bi-metalic element to actuate the control...

Anyone who is creative and resourceful enough to come up with that, can surely bang out a block-off plate for the original AAV, but I can offer you one in SS also! Contact me off line.

Cheers
Hi Ron, I was thinking an L-Jet AAV would fit the bill, it uses a bimetallic heating element.

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Old Sep 21st, 2018, 23:47   #29
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JP;

Indeed it might very well...I'd have to study it a bit closer to determine how that style could be implemented to conduct coolant heat in, in a B18/20 application...multiple roads lead to Rome...and it's always a good idea to use/adapt a current production and available piece...!

Cheers
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Old Mar 30th, 2019, 13:50   #30
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Further developments on the AAV front here:

http://forums.turbobricks.com/showthread.php?t=348331
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