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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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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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Old 20th-October-2009, 15:43
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Default Re: black stuff in the radiator water

This is a reacurrance of the problem last time it was apparent was 18 months ago when I changed the hoses and flushed the system - other than black stuff in the coolant and emulsified gearbox oil there are no apparent problems
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Old 20th-October-2009, 15:44
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Default Re: black stuff in the radiator water

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Originally Posted by ratty View Post
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.
OI YOU im gunna have to pay the cleaners to come in here again ya bastid
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Old 20th-October-2009, 15:50
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Default Re: black stuff in the radiator water

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Originally Posted by wantaquad View Post
This is a reacurrance of the problem last time it was apparent was 18 months ago when I changed the hoses and flushed the system - other than black stuff in the coolant and emulsified gearbox oil there are no apparent problems
what type of anti-freeze are you using?
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Old 22nd-October-2009, 00:01
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Default Re: black stuff in the radiator water

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Originally Posted by ratty View Post
It's more likely that the black goo is oil from your oil cooler leaking into your coolant.
Unless someone's put something they shouldn't into the gearbox or added something like slick50, gearbox fluid should be either ATF red or MTF clear dependant on year (ATF early/MTF late), so it's less likely to be oil/fluid from gearbox. Do you know what's in yours, and if it's been treated with anything? Having dismantled one of these rads recently it's construction means it's more likely to leak fluid at one of the external unions than inside the rad.
How long have you had the car, could anyone have added any kind of leak sealent to the coolant? otherwise the only black substance I can think of would be as you thought - hose rubber, which I guess means draining it and checking them all. If it is the rubber do you know what coolant was used? if so let us all know so we can avoid it!
Having said all this... ATF is corrosive stuff and if it is getting into the coolant it could be causing the hoses to disintegrate.
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Old 23rd-October-2009, 10:43
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Default Re: black stuff in the radiator water

Hi Gents - sorry for the delay in replying been away working.

Antifreeze is holts with anti corrosion additive - standard stuff really
I have known the history of this one for about 3 years and had the same symptoms 18 months ago - flushed it through and changed all the hoses at that time.

It has atf in the box but it is white and frothy like water has got it to the box...

I will be draining the box, changing the hoses, changing the oil cooler (full rad swap) in the next few days.

Cheers for the comments will let you know if I find anything else
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Old 25th-October-2009, 20:20
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Default Re: black stuff in the radiator water

Updated info. changed the rad and all the hoses today. Loads of Black Sludge has floated to the top of the system and built up in the heater,heater hoses, reservoir bottle and its hoses.
the engine block and main radiator was pretty clear really wierd.
Changed the gearbox oil - lots of water in it all white and frothy.
hopefully changing the oil cooler (in the rad) has cured it.
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Old 26th-October-2009, 17:19
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Default Re: black stuff in the radiator water

Had same prob in a Defender. that turned out to be the cyl head. It had been skimmed before I bought it. The repairers didnt flush the cooling system of engine oil.
I never got rid of it all. I flushed the system about 5 times with cleaner, never got to find if that worked. Some toe rag knicked the defender.

Hope it biled dry on him in the middle of a ram raid.
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  #18  
Old 26th-October-2009, 18:00
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Default Re: black stuff in the radiator water

Personally I hope it got hot and the git undid the rad cap scarring himself with full thickness burns.
Car thieves should be flogged in public.
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