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Can you identify this vacuum component? 1800

posted by  Whale on  Sun Feb 21 22:41 CST 2021
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last visit: Fri Jun 14 19:52 CST 2013
[RELATED]

As I was driving, I heard this snap from the engine compartment that was accompanied by my rpm racing to 2000. I pulled over with the car in neutral and opened the hood while the engine was still racing. I checked the throttle wire and it was in the idle position! After checking for a possible cause, I noticed the the cap and insert for a component on the hose leading from the intake manifold to the brake booster was missing. I stuffed the component cavity with paper which allowed the rpm to drop to normal? To date, I have not been able to identify the component in a manual or Volvo vender parts list to order a replacement. I have surveyed other 1800 engine compartment photos and not all of them have this. Questions: 1. What is this component? 2. What is its purpose? Where can I get a replacement?
Thanks,







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    Can you identify this vacuum component? 1800

    posted by  james_a_sousa on  Sat Feb 27 09:36 CST 2021
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    last visit: Thu Oct 23 18:51 CST 2014
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    Two things that you can try tu use a valve with smaller barbs -

    1, put a small section of the correct hose on first, then attach the larger hose. Find a hose the proper thickness. I always keep any hoses that I come across and some hoses from appliances are quite thin.

    2. Wrap the barbs with electrical tape to get the proper diameter than attach the hose. Clamp the hose tight and check it once and a while - vacuum is a small but irrestable force and may cause the tape to slowly move.







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      Can you identify this vacuum component? 1800 1970

      posted by  Whale on  Sat Feb 27 11:59 CST 2021
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      last visit: Fri Jun 14 19:52 CST 2013
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      I was able to purchase a proper size replacement from Planetman. Thanks anyway for the tip. Also, I was wrong about a screw on cap. It is a snap in cap.








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    Can you identify this vacuum component? 1800

    posted by  Ron Kwas on  Mon Feb 22 06:54 CST 2021
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    last visit: Fri Oct 24 04:03 CST 2014
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    Grepory;

    I agree with C1800...I believe some Check Valves on the vacuum line to Brake Booster are plastic, but that is the first time I've heard of one exploding with a snap, then disappearing...! Some vintages of Brake Booster have them at Vacuum fitting, and not separately in-line.

    You should give year when asking questions, but "throttle wire" suggests Fuel Injected...

    Cheers







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      Can you identify this vacuum component? 1800

      posted by  Whale on  Mon Feb 22 15:20 CST 2021
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      My car is a fuel injected 1970 1800E. I have concluded that the snap I heard was the screw-on cap that came off and hit a fan blade. I'll order a replacement that Eric might have in store.








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    Can you identify this vacuum component? 1800

    posted by  someone claiming to be C1800 on  Sun Feb 21 23:51 CST 2021 [RELATED]

    Likely the check valve leading to the brake booster. How were your brakes after the incident? Check valve available from the usual classic Volvo suppliers.








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      Can you identify this vacuum component? 1800

      posted by  planetman on  Mon Feb 22 09:17 CST 2021
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      last visit: Fri Oct 24 09:29 CST 2014
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      I agree and it sounds like the inline vacuum check valve for the brake booster came apart which is a not too uncommon occurrence especially if the it's the original check valve.

      AFAIK, no one sells the exact correct inline check valve and that is Volvo's fault.

      Volvo updated the brake booster check valve, but to a vacuum check valve used on 240/260. And although functionally the same, the problem is that hose barbs on the updated check valve are smaller than the original.

      You can use that valve, but it requires that you over-tighten the hose clamps on brake booster and that will shorten the life of the hose.

      When I discovered this problem 30 years ago, I found another check valve made by the same manufacturer that has the correct sized hose barbs.


      --
      Eric
      Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
      Torrance, CA 90502
      hiperformanceautoservice.com or oldvolvosonly.com








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        Can you identify this vacuum component? 1800

        posted by  Duck on  Mon Feb 22 11:02 CST 2021
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        last visit: Wed Apr 30 21:00 CST 2014
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        Eric,
        What is the make & part number for the brake check valve hat fits these injected 1800e's ? ATE?
        Thanks, Duck








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          Can you identify this vacuum component? 1800

          posted by  planetman on  Mon Feb 22 13:12 CST 2021
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          last visit: Fri Oct 24 09:29 CST 2014
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          The original Volvo part number for the check valve with the correct sized hose barbs was 680467, but Volvo updated it to a 1228272 and then updated it to 9485451.

          As I said, you can use the check valve with the smaller hose barbs by tightening the hose clamps, but that can damage the hose.

          FYI, we sell the check valves that are made by ATE with the correct sized hose barbs for $15.00 while Volvo sells the incorrect sized check valves for $31.00.



          --
          Eric
          Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
          Torrance, CA 90502
          hiperformanceautoservice.com or oldvolvosonly.com








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            Can you identify this vacuum component? 1800 1970

            posted by  Whale on  Mon Feb 22 15:25 CST 2021
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            last visit: Fri Jun 14 19:52 CST 2013
            [RELATED]

            Eric, I would like to purchase the check valve you described as fitting on the original hose size. Let me know the purchase arrangement and I will submit payment. MBambo@comcast.net







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