Grand WK antifreeze leak - JeepForum.com
 
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post #1 of 11 Old 09-24-2014, 05:12 AM Thread Starter
cristian_87
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Grand WK antifreeze leak

Hello guys !

My name is Cristian and I'm from Romania. I'm posting on this forum because I have a problem and nobody knows how to solve it.

My rig is a 2007 Grand WK 3.0 diesel Mercedes OM642.980 engine.

I have a coolant leak . It is situated near the starter. I took out the starter , the left engine mounting and lowered the front diff. It is a hole in the engine block and the problem is that whenever the pressure builds up in the coolant circuit , it start dripping. The loss is about 1 L for 1000 km. I dont't know if this a technological plug hole or something else should be there. I was considering to plug it but I don't want to blow up on the road.

I will attach some pictures. Also if you have some diagrams of this engine, it would be helpful. I tried to search in the GC service manual and also in the Mercedes one but with no luck.

Thank you in advance for your answers !

Attached Thumbnails
IMG_3149.JPG   IMG_3150.JPG   IMG_3151.JPG   IMG_3152.JPG   IMG_3153.JPG  

IMG_3154.JPG   IMG_3155.JPG   IMG_3156.JPG  
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post #2 of 11 Old 09-24-2014, 11:03 PM Thread Starter
cristian_87
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hey..

any opinion is welcomed ... I really don't know what to do ...
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post #3 of 11 Old 09-25-2014, 02:38 AM Thread Starter
cristian_87
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this is the hole in question..I don't know it's purpose...could someone help pls ?
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post #4 of 11 Old 09-25-2014, 06:36 AM Thread Starter
cristian_87
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I found out that the hole is for draining the V - it's a known problem for oil leaking but not for antifreeze

https://www.youtube.com/watch?v=TJ9T1C0UMAE
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post #5 of 11 Old 09-25-2014, 10:58 AM
caulk04
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Interesting, neat that they incorporated a valley drain into the block.

I'd think surely there is coolant leaking into the V and it's draining there, rather than coming from somewhere inside the block.

That's all the more help I am, I know next to nothing about this engine.

08 Limited Hemi - wheels, tires, springs...ya know, stuff
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post #6 of 11 Old 09-25-2014, 11:03 AM
tom19511
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Have you considered the water pump? Maybe blowing back under pressure?

Tom

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post #7 of 11 Old 09-25-2014, 07:41 PM
Tango.
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That looks like an oil leak.
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post #8 of 11 Old 09-25-2014, 11:06 PM Thread Starter
cristian_87
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i know it looks like oil but in some pictures you can see it's red...and also the drops that are coming threw the hole are red..I want to look in the V but I cannot replicate the drops unless I rev up the engine and heat it really well..

so I have to make room in the V but also keep the engine working ) I will keep you informed
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post #9 of 11 Old 09-26-2014, 06:50 PM
Tango.
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Is it transmission fluid?... that is red. That looks like oil to me... not antifreese which vaporizes.
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post #10 of 11 Old 01-18-2020, 02:08 PM
acdc
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This is from oil cooler seals.
I have the same problem
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post #11 of 11 Old 01-18-2020, 04:14 PM
3Recon
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wouldn't doing a pressure check on system show it.? pump it up to cap/system pressure it'll show it. not every one has a coolant pressure tester. hand pump would work just needs to get up to cap pressure a couples higher and hold (a cap or something that can seal system) good luck
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