M112 Vacuum Oil Change

Discussion in 'Engine' started by GadgetBoy, Sep 3, 2011.

  1. GadgetBoy

    GadgetBoy Active Member

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    Part 1

    If this has been done before I apologise for the duplication.

    I bought my C240 a few weeks ago and while it has a service history and the oil was changed about 2000 miles ago it was well over a year ago. So. oil change time.

    You're going to need, oil, an oil filter, an oil filter wrench and I'm using the vacuum method so we have a vacuum extractor.

    [​IMG][​IMG]

    Right. Let's get started. Park the car on a level surface and open the bonnet. (Always a good start for maintenance.)

    [​IMG][​IMG]

    Gently tug the corners of the engine cover upwards and it'll detach.

    [​IMG][​IMG]

    The bits we're interested in are shown here.

    [​IMG][​IMG]

    First things first. Remove and wipe the dipstick and lay it down beside the vacuum pump probe. Mark the length of the dipstick on the probe with some tape. More later.

    [​IMG][​IMG]

    Insert the probe in the dipstick hole. Make sure the tape disappears. You'll hear/feel a good "thunk" when you're at the bottom of the sump.

    [​IMG][​IMG]

    Remove the oil filler cap.

    [​IMG][​IMG]

    Pump the vacuum pump about 20 times. Oil will flow!

    [​IMG][​IMG]

    About every litre (see marks/bands on pump vessel) pump about 20 times again.

    [​IMG][​IMG]

    You can leave the pump to do its thang and get on with other stuff. Use your strap wrench to loosen the oil filter housing. Place a rag round the top and remove.

    [​IMG][​IMG]

    Place the oil filter assembly in a basin to drain.

    [​IMG][​IMG]

    Now is a good time for a cup of tea.

    [​IMG][​IMG]
     
    Last edited: Sep 3, 2011
  2. OP
    OP
    GadgetBoy

    GadgetBoy Active Member

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    Part 2

    Now the M112 has 8.5 litres of oil and the vacuum vessel is 6 litres so we need to stop and empty it. Note I have just under 5 litres.

    [​IMG][​IMG]

    Lift the probe until you see the tape. This will ensure the end of the probe is out of the oil and it won't siphon all over your garage floor/drive.

    [​IMG][​IMG]

    Detach the probe from the vacuum vessel, fit the spout and pour the used oil into a suitable container.

    [​IMG][​IMG][​IMG]

    Refit the probe, place at the bottom of the sump again and pump again.

    While the last bit of oil is extracting we can fit the filter. Pull the old filter off the assembly and wipe down. Remove the 4 O-rings. The picture shows where each one is.

    [​IMG][​IMG]

    Fit the new filter, apply a small amount of new oil to each O-ring and fit - largest first.

    [​IMG][​IMG]

    When the pump has evacuated all the oil you'll hear a cinema sucky straw sound and the feed pipe will clear.

    We have approximately another 4 litres.

    [​IMG][​IMG]

    [​IMG][​IMG]

    We're done with the vacuum pump now.

    The easiest way to fill up again is through the oil filter housing.

    [​IMG][​IMG]

    Insert your funnel and fill away. Introduce a volume slightly less than you removed, check the dipstick and top up to the Max mark.

    [​IMG][​IMG]

    Re-fit the oil filter assembly and tighten. If you don't have the correct square-drive tool (I don't) you're more likely to over-tighten it than under-tighten it. If you're straining you're over-tightening it! If you have the correct tool torque it up properly.

    Start the engine and make sure the oil pressure warning light goes out. Run the engine for a few minutes then switch off and let it sit for at least 5 minutes. Check the oil level again and top up if necessary.

    Finally. Reset your service indicator.

    [​IMG][​IMG]

    A lot of people don't believe vacuum pumps get all the oil out. This is the oil I extracted.

    [​IMG][​IMG]

    We have about 4.5 litres on the left and 3.75 litres on the right. That's 8.25 litres and my oil was at the Min on the dipstick. In my book that's pretty much all the oil.

    I hopes this helps others and I can thoroughly recommend the vacuum method.
     
    Last edited: Sep 3, 2011
    9 people like this.
  3. dog68

    dog68 Active Member

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    Impressive post Gadgetboy, very helpful. :thumb:
     
  4. horgantrevor

    horgantrevor MB Enthusiast

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    thx great post

    just in case but people MUST use the four O rings for oil filter other wise you can damage engine with oil starvation
     
  5. markjay

    markjay MB Club Veteran

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    Excellent write-up, and in fact this method is quite generic and can apply to many MB engines. Well done.
     
  6. Dichtung

    Dichtung Active Member

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    ^+1, :thumb: What make is your pumper ?
     
  7. OP
    OP
    GadgetBoy

    GadgetBoy Active Member

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    1 person likes this.
  8. grober

    grober MB Master

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    Excellent post - I'm a fan of vacuum extractors also.:thumb: My only comment would be that by potentially introducing the new oil directly into the main oil gallery it doesn't pass thro the new filter first. This is OK provided you are SCRUPULOUSLY clean in your operations. If you fill via the filler cap to sump route the oil has to pass through the oil pump inlet strainer and the new filter cartridge before entering the main oil gallery which IMHO is the safer routine oil change practice.:dk:
     
    2 people like this.
  9. OP
    OP
    GadgetBoy

    GadgetBoy Active Member

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    Makes no difference. Filling by the filler goes directly to the sump as well. The strainer is so coarse it wouldn't remove much contamination anyways, it's not a strainer per se, it's there to stop you dropping things in.
     
  10. murray motors

    murray motors Active Member

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    very good saves you lying on the cold wet ground
     
  11. StevenN

    StevenN Active Member

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    Anybody tried the Silverline one on Ebay at about £20?
    [​IMG]
     
  12. Will

    Will Hardcore MB Enthusiast

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    Nice writeup and a good effort :thumb:

    But - I have to say that I wouldn't recommend using a chain wrench on the plastic oil filter housing cap, it could easily crack or become damaged, and as you mention - you have no way tightening it correctly (just needs gently nipping up, 25Nm IIRC).

    You can buy a suitable tool from various suppliers (76mm), or the proper MB workshop tool isn't even that expensive (£10-20 from memory).

    Part number is 103589020900 - probably needs a 'W' in front of it.

    The draining/vacuum debate is a long running one, personally I prefer to drain - I find it very quick and easy to do, the undertray only takes 2 minutes to remove, and you can leave it dripping out whilst you do other stuff. Vacuum will suck all the way to the bottom, but 1/2 hour later more oil will have dripped down from the sides to the bottom of the sump. Vac it all out from the bottom, wait 1/2 hour then take out the sump plug and see ;)

    Normally gives you a quick opportunity to glance underneath and look for fluid leaks etc (oil, coolant) on the tray or on the engine itself.

    Horses for courses and all that I guess :)
     
  13. OP
    OP
    GadgetBoy

    GadgetBoy Active Member

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    I agree totally about having the correct tool for the filter housing. Especially if you have little or no experience. A chain wrench, as opposed to a strap wrench, will slip before it does any damage.
     
  14. digitaltennis

    digitaltennis New Member

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    Sorry to dig up an old thread. But just wanted to say thanks to you, GadgetBoy. Followed your tips with the extraction pump (I bought the same one)- very straight-forward job in the end. Thanks :)
     
  15. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Just a quick question. What spec oil 229.1 or 229.3? It must be at least the 229.3 for that engine.
     
  16. OP
    OP
    GadgetBoy

    GadgetBoy Active Member

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    After a lot of searching about it's apparently 229.3
     
  17. sspeed

    sspeed MB Enthusiast

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    I am a massive fan of the oil extractor pumps.. I have been using one for around 10 years on various cars i have owned..
    I have a PELA 650 and I wouldnt be without it...

    As an aside they are great for draining the LHM fluid from Citroens...
    etc, etc..
     

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