Volvo RWD 120-130 Forum

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Rattletrap... 120-130 1967

uid 26099's pic
posted by  Pooch on  Mon Apr 18 10:11 CST 2005
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last visit: Thu Oct 9 12:56 CST 2014
[RELATED]

Hello All:

1967 Volvo 122S wagon. I have been hearing a rattle or buzz from the engine compartment, only under very particular RPMs and other running conditions. I have isolated the noise to coming from inside the oil trap. Any clues?

Cheers,

Jeff Pucillo








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    Rattletrap... 120-130 1967

    posted by  Ron Kwas on  Mon Apr 18 10:54 CST 2005
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    last visit: Fri Oct 24 04:03 CST 2014
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    Jeff;

    PCV valves (located just above the oil trap) like to rattle when the idle RPMs equal the mechanical resonance of the valves' shuttle...I wouldn't worry about it too much unless it really bothers you...or you could clean the valve insides with carb cleaner...the mass change alone might change its resonance point enough...or just adjust the idle Rs a bit...it's typically a very tight match which causes the rattle...

    Cheers








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      Rattletrap... 120-130 1967

      uid 26099's pic
      posted by  Pooch on  Wed Apr 20 07:21 CST 2005
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      last visit: Thu Oct 9 12:56 CST 2014
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      Hello Ron:

      Okay, thanks for the response, but help me out here. I looked through the shop manual and I cannot find a mention of the PCV valves. What are they, where are they, what does PCV stand for? Not the same as PCV tubing used in plumbing? The valves' "shuttle" - sorry to sound ignorant, but huh?

      Cheers,

      Jeff Pucillo








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        Rattletrap... 120-130 1967

        posted by  Ron Kwas on  Wed Apr 20 09:58 CST 2005
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        last visit: Fri Oct 24 04:03 CST 2014
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        Jeff;

        "Shuttle" is the movable dingus* within the valve which opens by lifting off a seat under vacuum, or closes by spring pressure.

        See also: http://www.intelab.com/swem/pcv_diagrams.htm

        * that's called: explaining one unknown with another!

        Cheers








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          Rattletrap... 120-130 1967

          uid 26099's pic
          posted by  Pooch on  Tue Apr 26 05:39 CST 2005
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Thu Oct 9 12:56 CST 2014
          [RELATED]

          Hello All:

          Thanks for the very informative posts. I learn something new about these beasts every day, like it or not.

          Cheers,

          Jeff Pucillo







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