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How To Check The Engine Bay Vac Pipes On A V6 Omega

Discussion in 'Omega How to and FAQ's' started by Marks DTM Calib, Jun 28, 2006.

  1. Marks DTM Calib

    Marks DTM Calib Omega Tank Commander

    Messages:
    7,745
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    Location:
    Nottingham
    I get a lot of questions about the arrangement of the vac pipes in the Omega engine bay on the V6 models.

    The V6 uses Vacuum for a number of things

    Multiram
    Air injection
    Brake servo
    Climate/heater control.

    It is important that these pipes are connected correctly and have no leaks to get the best performance/economy from your engine and to guarantee operation of the heating/climate systems. Unfortunately they are often re-fitted incorrectly by garages following work and in some cases some of the pipes may have been in-correctly routed resulting in chafing and the pipes wearing through



    Later setup, identifiable by the presence of a vac tank on the base of the inlet trumpets at the front of the engine bay

    [​IMG]

    Earlier setup, similar to above but, no separate vac tank for the multiram, instead it is T'ed off the heater vacuum line where it passes through the bulk head.

    [​IMG]

    I have seen many of these setups where this T-piece has been moved to the brake servo which is great but, at full throttle there is very little vacuum so the multiram stops working!
     
  2. markey mark

    markey mark Member

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    Location:
    s****horpe lincs
    nice one mark up to your usaul standard mate !!
     
  3. gpb

    gpb New Member

    Messages:
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    Location:
    Oxfordshire, UK
    Nice one

    Just the job, thanks.

    Having already found one broken stub pipe and one disconnected hose on the vac system, this is just what I've been looking for to check the whole system out.:ROFLMAO:
    Regards
    GB
     
  4. Gte16v

    Gte16v New Member

    Messages:
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    Likes Received:
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    Location:
    LEEDS, UK
    Excellent Work - Plus

    Remember that both the vacuum reservoirs have valves in them.

    One of mine was faulty which caused direction problems with the interior heater blowers.

    I did a simple repair using a piece of fuel injection hose and an old bicycle valve fitted within the hose. ( about 1 1/2" ).

    Simply fit this new valve in line with vacuum hose that goes to large connector shown on above photo's.

    Simple but effective repair..

    Regards.

    Paul.
     
  5. mbconfuse

    mbconfuse New Member

    Messages:
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    Location:
    Berkshire
    Hi,

    On the vacuum tanks is there any other way of distinguishing between the two connections other than one is bigger than the other?

    I'm trying to figure out if the pipes to my front vacuum tank are the wrong way around, but the tow connections look to be the same size.

    Thanks,

    (’98, 3.0, MV6, Manual)
     
  6. veralum

    veralum Active Member

    Messages:
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    Location:
    St Albans
    has anyone got a vacuum tank?

    oneof mine has been bodged and doesn't work
     
  7. vectra eddie

    vectra eddie New Member

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    Location:
    greater manchester
    hi there ime thinking of converting my 1.8 ecotec vectra onto a v6 2.5. do you have any idea what would be involved.e.g electrics etc.
     
  8. seprim

    seprim Member

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    Location:
    ramsgate, Kent, UK
    phobucket piccy's not there any more

    Hi Mark
    Unfortunately the photobucket picc's have gone - can u update the links please :D
     
  9. Big_Paul

    Big_Paul New Member

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    Location:
    Portsmouth, UK
    This is just the diagram i have been searching for and its not here anymore!!!! Has anyone got an updated link or a copy of the picture i could have please! I getting desperate!! Cheers all!
     
  10. keith8b

    keith8b New Member

    Messages:
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    Likes Received:
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    Location:
    dudley
    vac valve check

    hi ya could you re-post the pics & diagrams for omega 2.5i as my heater only gets tepid at best & checked or changed what i can thermostat,hbv,rad cap all to no avail i think its vacum related but cannot figure it out
     

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