Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 9/2004 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

Help: replacing vacuum hose from oil trap to fire trap 850 1994

posted by  tina on  Thu Jun 26 11:47 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu Nov 24 09:34 CST 2011
[RELATED]

Hi,

I noticed that a previous owner had cut the vacuum hose leading from the oil trap to the fire trap - runs along the manifold next to the valve cover (presumably to offset the pressure buildup from the blocked fire trap, but now exhaust and oil leak from here). I am replacing my own fire trap this weekend (I hope... the volvospeed instructions look pretty easy).

So I stopped off at the dealer and they had the hose and said it should be pretty easy to replace and that if I plan to do the fire trap myself I was "doing the hard part". Well I can't even see where the vacuum hose runs. Does anyone know where I can find helpful diagrams and instructions for this? I have a Haynes manual but I can't find anything in there. It's a 1994 850 non-turbo.

Thanks in advance for any advice or help, I'm a newbie at home-repairs!








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Help: replacing vacuum hose from oil trap to fire trap 850 1992

    posted by  someone claiming to be Dmitri on  Thu Jun 26 22:30 CST 2003 [RELATED]

    This hose can go to the side of the manifold as shown on a photo
    on Bay 13, then it's fairly easy.

    On my motor it goes to an oil canister that is *beneath* the intake
    manifold, so the manifold has to be dismantled. It took me 6-7 hours
    to replace the hose! (The power improved when I did.)

    Dmitri








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      Help: replacing vacuum hose from oil trap to fire trap 850 1992

      posted by  someone claiming to be mark sloo on  Fri Jun 27 03:03 CST 2003 [RELATED]

      Dmitri,

      I've been trying to diagnose suspected crankcase pressure buildup on my '93 850 GLT. Please elaborate on your experiences.

      What is this oil canister. I've been told there is a pcv box under the intake manifold that is probably what you refer to.

      Did you replace the vent hose from the block (pcv box) to the flame trap and did it make a difference?

      Did you use a different part than was original to the car. (I've found out there is a recall on this hose - service campaign 69 A &/or B.)

      Anyway I'm leaking oil everywhere.

      Mark








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        Help: replacing vacuum hose from oil trap to fire trap 850 1992

        posted by  someone claiming to be Dmitri on  Fri Jun 27 05:22 CST 2003 [RELATED]

        Mark,

        Sorry, I don't know what PCV box is :) The hose leads to
        what is referred to in Haynes as oil separator. With a flash
        light I could see that the rubber elbow that connects the hose
        to the canister was broken. In fact I could pull the hose out
        from its hole between the branches of the manifold.

        I bought a Volvo replacement rubber elbows from the dealer
        (they are made more robust now) and had a full scale war with
        the intake manifold! I would say that it felt like extra 10 hp
        after that (N/A engine). Also, the idle became more stable
        (it hadn't got all stable until I changed a lot of other
        stuff).

        Dmitri








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          Help: replacing vacuum hose from oil trap to fire trap 850 1992

          posted by  tina on  Fri Jun 27 17:34 CST 2003
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Thu Nov 24 09:34 CST 2011
          [RELATED]

          It sounds like this is what I have to do - they called it the "oil trap" and the other end is the flame trap. My hise was actually cut! I have bought a hose joiner which may be a better solution for me than trying to replace the whole hose as it sounds hard.

          Could you describe the process of taking off the manifold and replacing the hose? Or perhaps this is just over my head...

          -Tina








          •   REPLY TO THIS MESSAGE    PRINT   SAVE 

            Help: replacing vacuum hose from oil trap to fire trap 850 1992

            posted by  someone claiming to be Dmitri on  Fri Jun 27 22:26 CST 2003 [RELATED]

            Yes, this is the oil trap, and it is under the intake manifold,
            and yes, the hose on your photo is the hose in question.

            To remove the intake manifold, you have to remove the fan,
            release and move aside the fuel lines with fuel injectors,
            and then unscrew all the bolts that hold the manifold in place,
            and that's the hardest part. I think a flexible bit holder
            will make it easier for the last bolt (passenger side) that
            I had to unscrew with a ring wrench. Basically, follow Haynes
            but do not remove the throttle housing and gas wire because
            this is not necessary. You will need a new gasket for the manifold.
            When putting the manifold in place, start tightening the bolts
            from the center to the sides. Allow 8 [!] hours for the job.

            The hose itself is just hard plastic with two rubber elbows
            on the ends, very easy to put on and off.

            Dmitri








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          Help: replacing vacuum hose from oil trap to fire trap 850 1992

          posted by  someone claiming to be mark sloo on  Fri Jun 27 10:00 CST 2003 [RELATED]

          Jeeeeezzzzz, I'm gonna check this out on my car!!. What prompted you to check this. Were you leaking oil or was it the rough idle?

          I tried to follow that tube but could not see where it went. I appear to have a rear main seal leak, but could this be it instead??

          Mark








          •   REPLY TO THIS MESSAGE    PRINT   SAVE 

            Help: replacing vacuum hose from oil trap to fire trap 850 1992

            posted by  someone claiming to be Dmitri on  Fri Jun 27 10:37 CST 2003 [RELATED]

            It was rough idle. I saw and replaced the rotten elbow on the flame trap end
            and could not help wondering about the other end. If the seal already leaks,
            I guess you'll have to replace it; but holes in this hose would rather ease
            the pressure than increase it.

            Dmitri







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.