 AAR repair, How to test etc |
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| thieuster |
 May 21 2015, 05:10 AM
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#1
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Member  Group: Members Posts: 447 Joined: 31-January 15 From: 275 mls NW from Stuttgart. Member No.: 18,384 Region Association: Europe  |
The eagle eyed among you have seen that the AAR is missing on the pics of my engine. It looks to be shot. It measures 13 Ohm. Somehow I am under the impression that I've read somewhere that it's a 13 Ohm wire, but needs 39 Ohm resistance when tested.
On the Pelican pages, I found an article how to remove the upper and lower part and a 'how to' when it comes to repairing the AAR. Sounds familiar? Finally: is there an alternative AAR from other makes/cars/models that can be used instead of the original Bosch VW thing? Menno |
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| Spoke |
May 21 2015, 05:31 AM
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#2
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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Inside the AAR is a bimetallic strip that turns the valve. Put it on 12V and see if it turns if not, it is possible to use some type of penetrating fluid to loosen it. You can take it apart an lube it as well.
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| rick 918-S |
May 21 2015, 07:26 AM
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#3
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Hey nice rack! -Celette Group: Members Posts: 20,458 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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(IMG:style_emoticons/default/agree.gif) Just soak it with PB or WD for a few days and connect it to 12 volts. Give it about 3-5 minutes to fully close.
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| Dave_Darling |
May 21 2015, 08:37 AM
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#4
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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13 ohms is the correct resistance.
To test: Hook up +12V to the wire coming from the bottom of the AAR, and ground the outside of it. Hook a hose up to one fitting on the valve. You should be able to blow through the valve when it is cold. After the power has been on for 5-10 minutes, you should not be able to blow through it. --DD |
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| era vulgaris |
May 21 2015, 11:41 AM
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#5
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J is for Genius Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States |
Also, just a head's up...it will be hot after a few minutes with the voltage applied so be careful picking it up. That's why it's a good idea to have a short length of hose to try and blow through rather than putting your mouth on the AAR itself.
The AAR on my old 72 was frozen. I filled a small tupperware with WD40 and let it soak submerged for a couple days. Worked perfectly after that. |
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| thieuster |
May 21 2015, 11:59 AM
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#6
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Member Group: Members Posts: 447 Joined: 31-January 15 From: 275 mls NW from Stuttgart. Member No.: 18,384 Region Association: Europe |
I just emptied a can WD40 in a plastic container and put the AAR in. Now let's see what happens in a few days time.
Keep you guys posted! Menno |
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| Ian Stott |
May 23 2015, 05:25 AM
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#7
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Senior Member Group: Members Posts: 907 Joined: 28-January 08 From: Moncton/Canada Member No.: 8,635 Region Association: Canada |
Would someone post a picture of this please. I want to make sure I identify it properly. Thx.
Ian Stott Moncton Canada |
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| thieuster |
May 23 2015, 05:34 AM
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#8
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Member Group: Members Posts: 447 Joined: 31-January 15 From: 275 mls NW from Stuttgart. Member No.: 18,384 Region Association: Europe |
QUOTE(Ian Stott @ May 23 2015, 01:25 PM)  Would someone post a picture of this please. I want to make sure I identify it properly. Thx. Ian Stott Moncton Canada From the 'net, forgot to take pics at the time. Now the AAR is back on the engine and hardly visible (IMG:http://www.914world.com/bbs2/uploads_offsite/c767170.r70.cf2.rackcdn.com-18384-1432380893.1.jpg) I still wonder which AAR from another brand/make will be a proper replacement. There will come a moment that these AAR really become obsolete. Menno |
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