M112 sump plug - to torque or not to torque?

Discussion in 'Engine' started by A-AvantGarde, Jun 16, 2019.

  1. A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    We're getting our trusty W203 ready for it's 2,000 mile charity adventure. So it's having an oil & plug change which we're doing ourselves (or rather my co-driver / co-pilot is doing the work).

    Anyway, for the engine oil sump plug, when we re-fit with the new copper washer is it a case of tigthen up by hand ensuring the washer is compressed, or is there a recommended torque setting please?

    Seen some conflicting numbers online, so just wanted to see if there was anything definitive from MB or anyone else from experience.

    Thanks in advance!
     
  2. Will

    Will MB Club Veteran

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    I think it’s around 30Nm from memory.
     
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  3. OP
    OP
    A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    Thanks Will. I’m still worried about ruining it. Anyone else have anything definitive?

    I’m erring on the side of caution and thinking as tight as possible by hand to crush the washer and then maybe another quarter turn for good measure?
     
  4. RichardF

    RichardF Hardcore MB Enthusiast

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    My torque wrench doesn't go that low. I just nip them up.
     
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  5. Alex

    Alex Hardcore MB Enthusiast

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    30Nm is pretty safe with Aluminium. Plenty of engine parts (both OEM and aftermarket) as well as 3-piece wheels are torqued to this number.
     
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  6. Petrol Pete

    Petrol Pete Hardcore MB Enthusiast

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    Buy a cheap oil sucker and you will never need to go near the sump bolt ever again, It's what most garages use these days any way.
     
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  7. Alex

    Alex Hardcore MB Enthusiast

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    Suckers have their place but not with all cars. 211 sump is a saddle bag design with two bungs. Can empty one chamber with the sucker but not the second one. Then there's oil in the cooler.
     
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  8. E55BOF

    E55BOF MB Club Veteran

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    If you are using a copper crush washer, as opposed to a flat washer, nip it up until it is crushed, then a little more for Granny, and that's it; you never know if some gorilla mechanic has overdone the brute force in the past and it's just about ready to fail. Having stripped a couple of sump threads on bikes in the past, despite using a torque wrench and the correct torque, I always use crush washers now.

    If you use a flat washer, use MBs torque figure.
     
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  9. OP
    OP
    A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    We have a pump and I appreciate vacuuming is the way it’s done these days. However, as the car is new to us I really wanted to drain it the old school way to see what comes out and replace the current washer.

    We’re using the copper washer I picked up from the Merc dealer along with the oil filter and air filters. Just trying to find the official torque figure, as I’ve seen some wildly different numbers on one of the US forums. Just being extra cautious!
     
    Last edited: Jun 16, 2019
  10. Will

    Will MB Club Veteran

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    I’m almost certain it will be 30Nm, and 25Nm for the filter housing (check to be sure, but it’s written on the top!)
     
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  11. OP
    OP
    A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    Cheers, yep you’re right about the filter housing it’s printed on the casing.

    Cool, I think we’ll go for 30Nm for the sump plug then!
     
  12. Petrol Pete

    Petrol Pete Hardcore MB Enthusiast

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    My C55 is a saddle sump so my oil sucker is not used on that engine, but for the price they are useful to have around,used mine at work yesterday to change the oil in 3 hydraulic power packs, saved me hours of work and mess.
     
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  13. OP
    OP
    A-AvantGarde

    A-AvantGarde Hardcore MB Enthusiast

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    Yep, definitely a useful bit of kit for any garage.
     
  14. pcthrillrider

    pcthrillrider Active Member

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