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Thread: Brown gunk in radiator pipe & on cap

  1. #1
    apriliaforum Member Mattys's Avatar
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    Question Brown gunk in radiator pipe & on cap

    What is this, i'm using water to cool the engine, that's okay right?

    The radiator has been flushed before, and it came back again.
    Just wondering what this "gunk" is... It kind of smells of oil.

  2. #2
    apriliaforum Member JonCarter's Avatar
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    you should be using a 50/50 mix of coolant to water if your using just tap water you will be boiling the water and bringing out the impuritys in the water, if it smells like oil keep an eye out on the level of the coolant if it goes down you could be looking into a head gasket job.

  3. #3
    apriliaforum Member Mattys's Avatar
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    Thanks for the reply.
    Okay, but will the water be doing any damage?
    The water keeps going down a lot, is this the head gasket?

    And what type of coolant should I buy?

    Thank you.

  4. #4
    apriliaforum expert mcglynn's Avatar
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    just get any sort of coolant, for water cooled engines/car motorbike whatever.

    mix it 50 50 or so as jon said.

    dont put any more in if your head gasket is gone. It will need replaced first.
    2001 Aprillia RS50

    Done:

    - MOT'd and TAX'd for a year
    - New Pirelli MT75's
    - New Pads all round
    - New bearings all round
    - New Iris Chain
    - New horn

    To Do:

    - Powdercoat Swingarm
    - Full Re-Spray
    - New Double Bubble Screen
    - New Stainless Bolts all Round


  5. #5
    apriliaforum Member Mattys's Avatar
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    I'm not sure that the gasket has gone yet, how would I be able to tell.

    And how much is one of them bloody things to buy & fit!?

  6. #6
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    Remember to use distilled water as well.
    RIP Spike

  7. #7
    apriliaforum expert mcglynn's Avatar
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    i just used normal water.

    a gasket set for the rs, is about 15 quid. you can buy top end gasket sets for half that.
    2001 Aprillia RS50

    Done:

    - MOT'd and TAX'd for a year
    - New Pirelli MT75's
    - New Pads all round
    - New bearings all round
    - New Iris Chain
    - New horn

    To Do:

    - Powdercoat Swingarm
    - Full Re-Spray
    - New Double Bubble Screen
    - New Stainless Bolts all Round


  8. #8
    apriliaforum expert Aprilia af1's Avatar
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    Quote Originally Posted by JonCarter View Post
    you should be using a 50/50 mix of coolant to water if your using just tap water you will be boiling the water and bringing out the impuritys in the water, if it smells like oil keep an eye out on the level of the coolant if it goes down you could be looking into a head gasket job.

    The 50/50 mix is for water and antifreeze. You can buy ready made stuff which to me looks like neat antifreeze.

    I've used plain tap water in my bike for a while, have also used antifreeze and ready made stuff. In my opinion they're all the same apart from the ready made stuff and antifreeze are supposed to keep engine temps down.

    The problem with plain water or tap water is it can corrode the barrel/ head/ and makes the water a little rusty most of the time.
    Aprilia af1 50 replica 1992
    rv6 engine, polini 47mm 70cc top end
    19mm carb, doppler er1 exhaust, derbi gpr50 cdi unit.
    malossi reed block standard reeds. 13/40 sprockets
    75mph at 11,500rpm clocked by a landrover freelander(probably more like 70mph).

    Other Bike: Aprilia af1 125 replica de-restricted from factory. SOLD


  9. #9
    apriliaforum expert RS Dude's Avatar
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    Quote Originally Posted by mcglynn View Post
    just get any sort of coolant, for water cooled engines/car motorbike whatever.

    mix it 50 50 or so as jon said.

    dont put any more in if your head gasket is gone. It will need replaced first.
    I was told/read that you cant just use car antifreeze (the blue stuff) because its not good for the bike and that you need to buy the green antifreeze for the bike.


    Took me ages to find the green s*it as well....lol
    **

  10. #10
    Tecnologia Reparto Corse RS_Patrick's Avatar
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    Quote Originally Posted by Mattys View Post
    What is this, i'm using water to cool the engine, that's okay right?

    The radiator has been flushed before, and it came back again.
    Just wondering what this "gunk" is... It kind of smells of oil.

    NOOOOOOOOO, Dont use water as it makes the Radiator, Cilinder and Waterpump corrode!

    The brown gunk is Corrosion residue, that theres Oil like substance in there can be because the Waterpump has corroded (shaft) and Oil from the gearbox is getting in there trough the oilseal, Or the Cilindergasket is leaking, but in that case the cooland would smell like Carbon.


    RS_Dude is the onlyone here with the right awnser it seems

    Altough they dont just come in Green, they also are in (Greenish)Blue.

    You need to buy Ready Made cooling fluid like Motul Inugel etc. Not stuff you need to mix your self.

    Cools better, can handle really high tempratures with out boiling, and basicly wont freeze, and most importandly it does not corrode any of the parts.
    Last edited by RS_Patrick; 06-07-2010 at 08:22 PM.

  11. #11
    apriliaforum expert Aprilia af1's Avatar
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    Quote Originally Posted by RS Dude View Post
    I was told/read that you cant just use car antifreeze (the blue stuff) because its not good for the bike and that you need to buy the green antifreeze for the bike.


    Took me ages to find the green s*it as well....lol

    Green stuff for bikes, whoever told you that doesn't know much about antifreeze.
    Antifreeze comes in different colours, blue lasts for i think 2 years before you have to change it and red lasts 5 years. There are other colours inbetween.

    But as partick says buy the ready made stuff. I've used it before.
    Aprilia af1 50 replica 1992
    rv6 engine, polini 47mm 70cc top end
    19mm carb, doppler er1 exhaust, derbi gpr50 cdi unit.
    malossi reed block standard reeds. 13/40 sprockets
    75mph at 11,500rpm clocked by a landrover freelander(probably more like 70mph).

    Other Bike: Aprilia af1 125 replica de-restricted from factory. SOLD


  12. #12
    apriliaforum Member Ashnello's Avatar
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    which of this motul stuff do i want to buy? because all i can see is made for specific cars


    Doppler er1 exhaust
    Mallosi paint
    No tax disc holder!!!

    Got a 106!!! woop woop, GTI rep here we come

  13. #13
    apriliaforum Member Mattys's Avatar
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    Thanks for all the replies guys.

    So, why when I use water, does it need topping up every day? It keeps going down, iv just put some proper stuff in now, went for a ride, and its just turned into gunk again.

    Will it need flushing?

  14. #14
    apriliaforum expert mcglynn's Avatar
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    the system has a breather pipe on it. It's possible the watter is heating up a lot and the movement of the cooling system and bike make the water boil and sevaporate out of the breather?
    2001 Aprillia RS50

    Done:

    - MOT'd and TAX'd for a year
    - New Pirelli MT75's
    - New Pads all round
    - New bearings all round
    - New Iris Chain
    - New horn

    To Do:

    - Powdercoat Swingarm
    - Full Re-Spray
    - New Double Bubble Screen
    - New Stainless Bolts all Round


  15. #15
    apriliaforum Member Mattys's Avatar
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    Possibly, i'll flush it and never use water again!

    Thanks guys.

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