what is a block heater on W124?

Discussion in 'Engine' started by tpv01, Jul 21, 2008.

  1. tpv01

    tpv01 Hardcore MB Enthusiast

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  2. Number_Cruncher

    Number_Cruncher Hardcore MB Enthusiast

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    Looks tempting doesn't it?

    When you look under the exhaust manifold, you probably won't find the heater, but you'll find a large blanking plug instead. This plug is in TIGHT. There are tales of people cracking the block while trying to undo it!

    If you do want to pre-heat, it's probably better to use something that plumbs into the bottom hose. I think they're made by Kenlowe.
     
  3. BTB 500

    BTB 500 MB Club Veteran

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    They are used in very cold climates to stop the cylinder block from freezing and potentially cracking ... many car parks in Canada (for example) have sockets to connect up to when you park.

    As mentioned you can get pre-heaters made by companies like Kenlowe that are slightly different - they normally heat the water and circulate it round via a pump. A gadget-mad friend of mine had one fitted to his Espace. The advantage is much faster warmup, better economy from cold, quicker heating/demisting, etc. But not really justified in the UK climate.

    I believe some emergency vehicles have them, so they can be driven hard straight from the garage (fire engines etc.).
     
  4. Dieselman

    Dieselman Banned

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    I think you are thinking of the much older 5 cylinder 3.0 diesel with a steel plug near the front of the block.
    That plug is the standard position for the block drain and it will come out no problem.

    and, yes it is tempting..
     
  5. Number_Cruncher

    Number_Cruncher Hardcore MB Enthusiast

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    >> That plug is the standard position for the block drain

    No, well at least not on my OM606 anyway. It's adjacent to the standard block drain, near the back of the engine.
     
  6. Dieselman

    Dieselman Banned

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    Ah, yes. You're correct. I can see the drain next to it on further inspection.

    I can't find a part number for the heater, do you know it by any chance.?
     
  7. grober

    grober MB Club Veteran

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    Last edited: Jul 21, 2008
  8. Number_Cruncher

    Number_Cruncher Hardcore MB Enthusiast

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