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  #1  
Old 20th-October-2009, 14:42
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Default black stuff in the radiator water

Has anyone had a black silicon type sticky stuff appear in the radiator water - its definitly not a head gasket problem - it appears to be the hoses breaking up as it doesn't quite mix with the water and the hoses are soft and spongy as they would be if they were being eaten away by something corrosive.
There is some water contamination of the gear box oil so - could the gear oil be eating away the hoses due to the oil cooler leaking into the radiator - and the black goo is the hoses rotting from the inside?

any ideas would be greatfully received
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Old 20th-October-2009, 14:54
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
Has anyone had a black silicon type sticky stuff appear in the radiator water - its definitly not a head gasket problem - it appears to be the hoses breaking up as it doesn't quite mix with the water and the hoses are soft and spongy as they would be if they were being eaten away by something corrosive.
There is some water contamination of the gear box oil so - could the gear oil be eating away the hoses due to the oil cooler leaking into the radiator - and the black goo is the hoses rotting from the inside?

any ideas would be greatfully received
It's more likely that the black goo is oil from your oil cooler leaking into your coolant.
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Old 20th-October-2009, 14:58
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Default Re: black stuff in the radiator water

Thanks ratty that was my first thought but the oil cooler on this one (manual) is air cooled and doesn't go through the rad - the one in the rad does the gerbox oil
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Old 20th-October-2009, 15:03
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
Thanks ratty that was my first thought but the oil cooler on this one (manual) is air cooled and doesn't go through the rad - the one in the rad does the gerbox oil
Are you sure that the engine oil cooler isn't a seperate unit bolted to the side of the engine rather than a radiator type unit?

What model and engine type have you got?
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Old 20th-October-2009, 15:19
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Default Re: black stuff in the radiator water

Its a p38 2.5 dse manual -
The oil cooler pipes run from below the oil filter housing out to a radiator mounted in front of the main radiator.
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Old 20th-October-2009, 15:24
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
Its a p38 2.5 dse manual -
The oil cooler pipes run from below the oil filter housing out to a radiator mounted in front of the main radiator.
yep yer right, it's the square shaped air cooled rad type one in that case.

I recently had issues with my TD5 and I was getting oil into my coolant. Just like your Rangie it stayed as black gunge rather than mixing and forming an emulsion. The bad news is mine turned out to be due to a cracked head. It was cracked on the inlet side so was being pressurised by the turbo.

Do your hoses get hard after a quick drive?
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Old 20th-October-2009, 15:27
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Default Re: black stuff in the radiator water

no ther is no extra pressure at all
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Old 20th-October-2009, 15:29
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
no ther is no extra pressure at all
When you say a couple of your pipes have gone soft, do they crackle when you squeeze them?
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Old 20th-October-2009, 15:35
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Default Re: black stuff in the radiator water

Nope - they are all soft and sticky both inside and out - the coolant is even beginning to seep through making them look like they are sweating
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Old 20th-October-2009, 15:40
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
Nope - they are all soft and sticky both inside and out - the coolant is even beginning to seep through making them look like they are sweating
I've come across sticky pipes before but never ones that have gone so bad that they are able to allow the coolant to wick through. I would usually say that no it's not your hoses at fault but from what you're saying I'm thinking that yes it is. If they have gone porous I would change them and then flush the cooling. Then monitor the situation to see if it re-occurss.
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