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Thread: I have oil in my coolant!

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    Default I have oil in my coolant!

    I have oil in my coolant! I have read up on it here and apparently it could be as simple a fix as changing the plugs under the fins? Is this true? I am going to do the vmax cam upgrade and carburetor ugrade soon so I will have it pulled apart, should I check for any other problems that might be leading to the oil/water mix?

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    I'm sorry to say that I think you have misunderstood the information about the plugs. I don't think there is anyway that they can cause you to get oil in your coolant. Unfortunately, I think you have a much bigger problem. I'm not even sure that your Royal Star has those plugs, I don't know for sure but all the posts I've seen here about them has been in regards to the Royal Star Venture.

    Hopefully somebody else will come up with a simpler explanation but my first thought is a bad head gasket.

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    Freebird is correct, the plugs are just an external coolant leak concern, and have no way of causing your concern.
    Yours does have the same freeze plug style as the venture.
    You must have a head gasket failure to allow oil into your coolant.
    Mike
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    I may be way off base here, but couldn't the Breather (twinkie) cause oil and coolant to mix either from a failed gasket or an internal crack ? The only place in the manual that I could find that reference's the breather is on page 4-23
    Jay
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    Quote Originally Posted by ragtop69gs View Post
    I may be way off base here, but couldn't the Breather (twinkie) cause oil and coolant to mix either from a failed gasket or an internal crack ? The only place in the manual that I could find that reference's the breather is on page 4-23
    Remote, yet possible???
    Good call ragtop
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    Always best to start with the easy to get at things first.
    Jay
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    That sux. Ok so even if it is the Twinkie the gasket is more than likely faulty. If there is a crack would I be able to see it?

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    Yeah I don't remember seeing the plugs under the fins either

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    Quote Originally Posted by mbelik View Post
    That sux. Ok so even if it is the Twinkie the gasket is more than likely faulty. If there is a crack would I be able to see it?
    Hard to say if it could be seen, if there is a crack, it may open under heat or pressure. There are methods for finding cracks that are not visible.
    Jay
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    Default oil in water

    My bet would be a head gasket.

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    Ok well I will go with the gasket just ordered a set from thumpertalk. I will start pulling the bike apart today and get it ready. Means I probably won't get a ride until after Easter. I'm still waiting for a mate to make up the adapters for the 32 mm carbies so I guess I might need to give him a bit of push to get them done.

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    Default This has happened before may not be serious

    I had this happen on by 98 Royal Star Tour Classic, and it turned out to be the seals on the water pump. There are a set of seals on the driven shaft that runs the pump, one side keeps coolant in and oil out, the other keeps oil in and coolant out. There is a chamber between the two that should stay dry, it has a small vent tube that you can check, if it is wet with either oil or coolant, that should tell you where the issue is.

    This is not the only place where coolant and oil could mix, but in my experience on this forum and others over the past 15 years this has been the most common cause.

    The fix is relatively easy and cheap, and you can buy a rebuild kit from Yamaha.

    I will tell you it is very difficult to get all of the oil out of the coolant system, it may take repeated flushes.

    Other wise do a compression test and leak down test to determine if you have a blown head gasket, very rare occurance on these motors.
    Steve K
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    Steve, That sounds like a better possibility of the cause. I do recall reading about what you are saying. That or a head gasket are more likely than what I suggested.
    Jay
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    Hello,
    If there is no bubbling in the reservoir, then this is the water pump seal.

    Chris

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    Do you have coolant fluid in your oil?

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