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Thread: Mystery: Valve cover

  1. #1
    Registered User ColKlink's Avatar
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    Mystery: Valve cover

    Hello;

    On our ’61 with a 928 engine, we have a valve cover as per the attached image. This appears to be the early version that was replaced somewhere around 56, based on my collection of photos (I can’t tell from the EPC or the parts manuals, they all list both versions with no chassis number change).

    I have over 300 changes in my database, but oddly, that isn't one of them. Does anyone know at what chassis number the cover changed? Perhaps it changed at the same time the one side cover was removed from the block?

    Did they bring this version back for the 928 engine or did someone install the incorrect cover?

    Thanks.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  2. #2
    Savour the Journey ! aldesso's Avatar
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    Re: Mystery: Valve cover

    Quote Originally Posted by ColKlink View Post
    Hello;

    On our ’61 with a 928 engine, we have a valve cover as per the attached image. This appears to be the early version that was replaced somewhere around 56, based on my collection of photos (I can’t tell from the EPC or the parts manuals, they all list both versions with no chassis number change).

    I have over 300 changes in my database, but oddly, that isn't one of them. Does anyone know at what chassis number the cover changed? Perhaps it changed at the same time the one side cover was removed from the block?

    Did they bring this version back for the 928 engine or did someone install the incorrect cover?

    Thanks.
    Roland it is hard to say,

    I have seen both a more forward position of the filler neck as well as the one in your pic except for the early cars. The earlier cars also had a vertical side on the carb side, not the "wave". Is yours vertical?

    - Some of the later car valve covers seem to have strengthening ribs on the carb side, other don't, does yours have them?

    - The second attachment point for the ignition wire loom was added at some point (maybe for use of the cover on other production cars?) yours has it and therefore it is "later" cover. Is the cover correct for a 928? I do not know.

    I am sure I missed some other possible clues, there are also some interior reinforcements added at some point ... but as far as knowing the distinctions, we would have to take pics of the inside of our valve covers...
    Last edited by aldesso; 06-04-2018 at 01:47 PM.
    Marc G.
    __________________________________________________ _______
    '57 190SL Coupe, Blaugrün (DB268) / Tan (1068) #121 040 7502070
    "Green Hornet" restoration log

  3. #3
    Administrator JimVillers's Avatar
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    Re: Mystery: Valve cover

    Roland ..... The valve covers for earlier engines will not fit the 928 and later heads. The change in the valve adjustment mechanism required a taller valve cover thus the low banjo-type connection to the breather hose.
    Jim Villers
    1961 190SL, 230SL 5-speed, MGB 5-speed, Porsche 356C; 1967 Porsche 911; 1950 Jeep CJ3A

  4. #4
    Gerry Lazo 56 190SL owner walazos's Avatar
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    Re: Mystery: Valve cover

    Roland,

    Here is my early car valve cover. It is quite a bit different than what you show.
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    Gerry Lazo
    56 190SL (6500870)

  5. #5
    Savour the Journey ! aldesso's Avatar
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    Re: Mystery: Valve cover

    Quote Originally Posted by JimVillers View Post
    Roland ..... The valve covers for earlier engines will not fit the 928 and later heads. The change in the valve adjustment mechanism required a taller valve cover thus the low banjo-type connection to the breather hose.
    I know very unlikely ... but, are you sure you have a 928 or could it be that the engine was replaced at some point for a 921 ...
    Marc G.
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    "Green Hornet" restoration log

  6. #6
    Registered User ColKlink's Avatar
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    Re: Mystery: Valve cover

    Quote Originally Posted by aldesso View Post
    I know very unlikely ... but, are you sure you have a 928 or could it be that the engine was replaced at some point for a 921 ...
    Thanks, always expect the unexpected

    But it is a 928, here's a pic
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    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  7. #7
    Registered User ColKlink's Avatar
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    Re: Mystery: Valve cover

    Thanks for the tips everyone; I think Jim nailed it.
    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  8. #8
    Registered User ColKlink's Avatar
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    Re: Mystery: Valve cover

    Gerry, what year is your car? Your valve cover appears to be identical in all aspects to the MB factory photo (attached), at least from the parts I can see in your photo ... except it has a banjo fitting. Do you think yours is original?

    Thanks.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  9. #9
    Registered User ColKlink's Avatar
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    Re: Mystery: Valve cover

    As Marc points out above, there were a number of changes to these covers. It would be nice to be able to put together a timeline.

    I thought perhaps the banjo disappeared with engine side-cover change, chassis # 8501778 (engine 8501732) but that can’t be. As I mentioned, from my photo collection it looks like the change occurred sometime in ’56.
    Well, who knew, so many changes to a simply valve cover.


    I’ve attached a crop of a photo I have named ‘190SL Engine compartment 1 yr old’ which places the chassis number around 6502243; note: no banjo fitting. So at some time in that first year, the vent changed.
    I have photos with the valve cover + banjo fittings held with hex screws, then I have photos of the newer cover with angle piece but held with the large 300sl style ‘nuts’. Speaking of which, this is driving me nuts.

    If anyone has photos of their valve covers up to let’s say up to chassis 7500000 that is different form already posted ones, please share so I can get this timeline figured out.
    Don’t forget to post your chassis number! If you don’t want to post ti in the forum, feel free to PM me.
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    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  10. #10
    Gerry Lazo 56 190SL owner walazos's Avatar
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    Re: Mystery: Valve cover

    Roland,

    I do believe mine is original based on my conversations with previous owner.
    Mine is 6500870
    Gerry Lazo
    56 190SL (6500870)

  11. #11
    Registered User ColKlink's Avatar
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    Re: Mystery: Valve cover

    Quote Originally Posted by walazos View Post
    Roland,

    I do believe mine is original based on my conversations with previous owner.
    Mine is 6500870

    Thanks Gerry; so early in '56 it was already changed which jives with the other photo I posted (second one above). So now, we just need owners with very early cars, pre 6500870 chassis numbers, to take a look please.
    Roland W.

    '59 190SL #14333: DOB June 12, 1959 (Silver)
    '61 190SL # 22385 DOB Sept 1, 1961 (Light Blue)
    Some photos, documents and work-in-progress pics. Updated Jul 10, 2009

  12. #12
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: Mystery: Valve cover

    Mine is a December ‘55 built car. My VIN #1210425501678
    The head photo from Roland looks like a 940 head. I will compare to mine when back home on Monday.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Andre Hudon; 06-09-2018 at 09:38 AM.
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  13. #13
    Savour the Journey ! aldesso's Avatar
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    Re: Mystery: Valve cover

    Quote Originally Posted by ColKlink View Post
    If anyone has photos of their valve covers up to let’s say up to chassis 7500000 that is different form already posted ones, please share so I can get this timeline figured out.
    Don’t forget to post your chassis number! If you don’t want to post ti in the forum, feel free to PM me.
    Roland,
    Here is my original 921 pre-mechanical restoration. Just past your date (7502070) but it still has a single hole for the ignition wire loom.

    Click image for larger version. 

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    Last edited by aldesso; 06-11-2018 at 11:13 AM.
    Marc G.
    __________________________________________________ _______
    '57 190SL Coupe, Blaugrün (DB268) / Tan (1068) #121 040 7502070
    "Green Hornet" restoration log

  14. #14
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: Mystery: Valve cover

    This is my 940 valve cover.
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