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Thread: Cream in radiator cap

  1. #1
    TTM
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    Cream in radiator cap

    Hi all,
    The Mille has a bit of creamy substance on the rubber seal for the main radiator filler neck, and also a bit on the cap for the coolant top-up tank. There isn't loads, and the engine oil isn't creamy, only the two coolant caps. Also, a bit of coolant leaks from between the thermostat valve and the top hose (see here, parts 9 & 15)

    Has anyone had this before? Bit worried it might be head gasket Thought I'd ask on here incase it could be anything else. It's a 99 Mille if that helps. It's not really had a long run in ages - I only use it to go 8 miles to work which is 95% through town.

    Thanks in advance

  2. #2
    Evil Twin
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    never a good sign in the water side bud so you ,ay need to investigate this.

    if it was creamy in the oil filler id say short journey syndrome and a good run would clear it .

    may be the water pump seal etc

  3. #3
    TTM
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    Thanks for replying lonner.

    I forgot to mention, I changed the coolant a month or two ago from blue to pink (the new pink stuff is the Halfords ready mixed 5 year stuff, it didn't say it was incompatible with any engine types as I know the Mille engine is aluminium or something). I can't remember if there was cream in there before I changed it though.

    I just flushed the old coolant out with a hose, then filled up with the new pink stuff with it on the side stand.

  4. #4
    AMA Pit Boss supertedlover's Avatar
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    Halfords pre mix. You must be minted. Even so the antifreeze isnt at fault (although pre mix is usually biased by more water than antifreeze). Clean it up give it a run and see if it comes back. If it does you have an oil contamination from somewhere and it will need checking out. Give AP a call 01827 285500, they will help you.

  5. #5
    Evil Twin
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    the pink is fine and ive used it too for car van bikes etc

  6. #6
    TTM
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    Quote Originally Posted by supertedlover View Post
    Halfords pre mix. You must be minted.
    It was being funny a while ago (doing the small leak thing which it's still doing) and I wanted to be sure the new coolant was right to rule it out. I do admit it is a rip off though, but it was a Sunday and I needed it that day.

    I've gone to work on it today and it's running fine, no leaks from that join - it only seems to do that every once in a while. I'll check the filler neck tonight for the mayonnaise.

    There isn't any coloured smoke coming out of the exhaust - I even checked it in my mirror when riding. Could it be one of the seals on the water pump? It seems funny that I get a dribble from that area and the coolant has a tiny bit of oil in it, but no coolant in the oil.

  7. #7
    One Liter Duc Eater nikfubar's Avatar
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    Pretty sure the pump has two seals to stop the oil & water mixing & if one of the seals has gone there is a drain hole on the pump & whatevers coming out of it will tell you which seal has gone

    I used to use the Halfords pink stuff but changed to Putoline ready mixed coolant & there's so little colour in it you can't see how much is in the expansion bottle
    Last edited by nikfubar; February 14th, 2012 at 02:20 AM.

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