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Engine smell or gases / crankcase ?

Discussion in 'Engine & Transmission' started by Ian and Shelley, Jul 21, 2019.

  1. Ian and Shelley

    Ian and Shelley Active Member

    Messages:
    347
    Location:
    Umina Beach
    Hello..

    Just back from a weekend in the Hawksbury and the Kombi all went well...a good drive...

    Twice we noted some engine gases or smells When descending..

    While driving along all is good but some engine smell was noted only on long downhill when engine cruising / foot off the throttle....

    Could this be crankcase pressure ? Resulting in gasses being released from somewhere? Initial thoughts are oil breather box or similar.

    All advice or suggestions most welcome...

    Thanks
     
  2. oldman

    oldman Super Moderator Staff Member

    Messages:
    10,773
    Location:
    Avalon Beach NSW
    Did you have the heater on ....?
    If so, could be the start of corroding heater boxes.
    Exhaust runs through the heater boxes, transferring heat via cast fins.
    Clean air is blown over these fins warming up and then into the cabin.
    If there is a pin hole, or larger, in the exhaust, within the heater box, the gases mix with the clean air and you get exhaust/engine smell......
    Cheers,
    Mark
     
    Wayne murray likes this.
  3. Ian and Shelley

    Ian and Shelley Active Member

    Messages:
    347
    Location:
    Umina Beach
    Thanks,

    However I have disconnected the heater boxes from hose already...removed these before I gave the heat exchangers a thorough clean and never reconnected to keep engine smells out of vehicle as much as possible...

    Could exhaust gases be just creeping back inside from else where?
     
  4. oldman

    oldman Super Moderator Staff Member

    Messages:
    10,773
    Location:
    Avalon Beach NSW
    Possibly....If the tailgate seal is not fitted up properly.....exhaust may be getting that way....
    Cheers,
    Mark
     

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