W115 240D - Covid project - Page 4





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  1. #61
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    Default Re: W115 240D - Covid project

    I need some advice - cooling related.

    If I remember correctly the coolant temperature always hovered around 80 degC (see the picture below). I went to the local filling station over the weekend which is about a 5km round trip.

    On my way back the temperature started kreeping up to 100, by the time I got home It was at 100 and slowly increasing. The top hoses on the engine were hot but the bottom hose of the radiator was still cold.

    Now, as mentioned in a previous post , I drained the coolant via the bottom hose of the radiator. I topped up with engine coolant directly into the radiator and it still is on its mark. No water leaks as far as I could determine.

    So do I have an air lock, sticky thermostat or is that "tjierie-tjierie" sound from the water pump area the root of my problem?
    Last edited by Tom13; 2020/04/20 at 07:52 PM.
    Mitsubishi Pajero 3.2 D-ID GLX LWB

  2. #62
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    Default Re: W115 240D - Covid project

    Image attached.Click image for larger version. 

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    Mitsubishi Pajero 3.2 D-ID GLX LWB

  3. #63
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    Default Re: W115 240D - Covid project

    Water pump is stuffed
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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  4. #64
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    Default Re: W115 240D - Covid project

    Quote Originally Posted by jelo View Post
    Water pump is stuffed
    The $hit has hit the fan. Ordered a new water pump and proceeded to fit it today. Due to the design of the pump and its aluminium base the bolts tend to seize and snap. Took my time and got 4 of the 5 bolts out but the last one snapped off (Murphy's law).

    To get the bolt out the radiator needs to come out. When I removed the bottom radiator hose a small amount of jelly like substance came out with the coolant. On further inspection I found that the connection to the thermostat was completely blocked (see pic) with this solidified coolant.

    Anybody else experienced this before and how do I flush the system to ensure I get most of it out?

    The water pump was perfect but I am replacing it in any case. At least I found the real problem in the process.


    Click image for larger version. 

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  5. #65
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    Default Re: W115 240D - Covid project

    Coke
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  6. #66
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    Default Re: W115 240D - Covid project

    Yep, run it without the thermostat and fill up with some coke, also, you will need to get that radiator rodded or re cored. With that level of corrosion and crap in the system, I hope the sleeves have not taken a pounding and caused rust on the cold side of the sleeve.

    You could unsolder the top and bottom of the radiator and DIY, use the dipstick to open the cores. The muck is oily, so will need something to soften/loosen that, diesel also works.

    It's a messy time consuming job, but at this stage if you do not do it properly, you are going to sit with a cracked head down the line.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  7. #67
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    Default Re: W115 240D - Covid project

    En daai heads hou van kraak
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  8. #68
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    Default Re: W115 240D - Covid project

    Try and run the engine without the radiator when you flush it, try and make something, a 20L bucket with the lower radiator hose connected to the bottom of the bucket, fit a fitting on, use a steel bucket or some plumbing fittings, and the top hose emptying into the bucket, but through a couple of layers of mutton cloth to try and catch the crud coming out of the engine. Otherwise you will be circulating the crud through your new radiator.

    Then do the radiator.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  9. #69
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    Default Re: W115 240D - Covid project

    Quote Originally Posted by Reenen View Post
    En daai heads hou van kraak
    Yep, presies wat met die 5 gat watse body daar by jou le gebeur het ....
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  10. #70
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    Default Re: W115 240D - Covid project

    Thanks ZuluCowboy and Reenen. Will give the coke remedy a go.

    How much Coke in the system and for how long do I idle it?

    I checked some of the other hoses but they all appear to be clean. I will inspect the radiator once it's out.

    Luckily it is not all doom and gloom - got the cigarette lighter in the ashtray to work again, not that I smoke, but if it is there it needs to be in working order. Glove compartment has a working light and one of the door locks was sticky. The door mechanism is easy to remove, clean and lube. I must say I love the robust simplicity of these old Mercs.
    Mitsubishi Pajero 3.2 D-ID GLX LWB

  11. #71
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    Default Re: W115 240D - Covid project

    Just Coke. All of it.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  12. #72
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    Default Re: W115 240D - Covid project

    There should also be a bolt on the exhaust side of the block, below about No3, 19mm if I remember correctly to help flush the motor.

    You can run it for a while, provided there is always obviously water in the engine. 3x2L should help, I have even run drain cleaner in there to try and get crud out.

    Just don't run it through the radiator, will block it in no time.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  13. #73
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    Default Re: W115 240D - Covid project

    Maar coke maak die aanpaksels in radiator los. En maak partykeer dat n heel radiator skielik lek
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  14. #74
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    Default Re: W115 240D - Covid project

    Thanks for the advice. Will continue tomorrow.
    Mitsubishi Pajero 3.2 D-ID GLX LWB

  15. #75
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    Default Re: W115 240D - Covid project

    Radiator and cooling all sorted, thanks for the advice once again.

    Anybody know where I can source new engine and gearbox mounts for this W115 or W114?
    Mitsubishi Pajero 3.2 D-ID GLX LWB

  16. #76
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    Default Re: W115 240D - Covid project

    I'm almost 100% certain the W123 engine mounts are the same as 114/115.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  17. #77
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    Default Re: W115 240D - Covid project

    Quote Originally Posted by ZuluCowboy View Post
    I'm almost 100% certain the W123 engine mounts are the same as 114/115.
    Al sou hulle effens anders lyk, nog steeds interchangeable
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  18. #78
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    Default Re: W115 240D - Covid project

    Thanks, yes they do look slightly different and good to know they are interchangeable.

    I used Pelican Parts to compare the parts - great site dedicated to older Mercedes cars. Sadly they are in the US.

    https://www.pelicanparts.com/Mercedes-Benz/index-SC.htm
    Last edited by Tom13; 2020/07/07 at 08:04 PM.
    Mitsubishi Pajero 3.2 D-ID GLX LWB

  19. #79
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    Default Re: W115 240D - Covid project

    Quote Originally Posted by Tom13 View Post
    Radiator and cooling all sorted, thanks for the advice once again.

    Anybody know where I can source new engine and gearbox mounts for this W115 or W114?
    Does Imcomex still exist? I used to buy good quality aftermarket parts for my W115 there. In or near Midrand.



  20. #80
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    Default Re: W115 240D - Covid project

    Quote Originally Posted by antvz View Post
    Does Imcomex still exist? I used to buy good quality aftermarket parts for my W115 there. In or near Midrand.
    Howdy Ant, long time no hear!!
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

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