coolant in oil

tdking5

tdking5

Hello, i need help this is my first bike and i


really don't know whats wrong with my bike.
I have a 05 honda crf 250. It was running really good at first then it started getting coolant in the oil. my bike would start smoking white on first start up. i seen coolant in my exhaust.from what my friends say that its probably a water pump seal or head gasket. but i was looking for more of a expert opinion thing any help will help. 20140610_215242.jpg dip stick.jpg green oil when i checked it after riding then when i drained my oil.
 
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SRAD97750

SRAD97750

Moderator
Staff member
I suspect the Water pump seal. I would replace the entire impeller while you're in there.
With water in the exhaust pipe, the head gasket may also be damaged.
Be sure to flush both systems really good to get any residual contaminants from the oil/water 'milkshake.'

I don't suggest riding it until you get this sorted.
Might be a good time to measure the piston rings while you're in there!-BIG DAN:thumb:
 
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2strokesteve89

2strokesteve89

tdking5:
Hello, i need help this is my first bike and i


really don't know whats wrong with my bike.
I have a 05 honda crf 250. It was running really good at first then it started getting coolant in the oil. my bike would start smoking white on first start up. i seen coolant in my exhaust.from what my friends say that its probably a water pump seal or head gasket. but i was looking for more of a expert opinion thing any help will help. View attachment 22766 View attachment 22765 green oil when i checked it after riding then when i drained my oil.
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I would suspect head gasket first, it would explain everything you got. If you have a compression tester and access to an air compressor, you can pressurize your cylinder via the compression tester hose and compressor, remove radiator cap and look for bubbles out of radiator, or coolant blowing out, of course piston has to be on compression TDC also.
 
snowflake

snowflake

2strokesteve89:
I would suspect head gasket first, it would explain everything you got. If you have a compression tester and access to an air compressor, you can pressurize your cylinder via the compression tester hose and compressor, remove radiator cap and look for bubbles out of radiator, or coolant blowing out, of course piston has to be on compression TDC also.
Click to expand...
exactly. Except I might add, start the bike with the radiator cap off, you should see bubbles almost instantly
 
2strokesteve89

2strokesteve89

tdking5:
i dont have access to a compression tester. should i just change the water pump seal and head gasket just to be safe?
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Not expensive or time consuming, if a person changes enough parts they usually fix something. But if you buy a tool to check or repair a problem with your bike, you'll have it next time you need it, plus the experience of having dealt with previous repairs, only makes you more capable of fixing you're own bike yourself, that's more valuable than whatever you spend on tools you may or may not ever use again.
 
2strokesteve89

2strokesteve89

tdking5:
would a water pump seal make the engine burn coolant?
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No......except the small amount that may make it by the valve seals and rings, but the most likely cause for coolant out the exhaust is a head gasket. And of course it will run past the rings into the crank case to mix with the oil also.
 
O

ossagp

It is pretty cheap to build something to pressure test with and even cheaper to do as flake suggested while you are sitting around wondering what to do. my procedure for that is to adjust the way the bike is leaning to where a small level on the radiator input spout is showing it right at level, you can prop things under the wheels etc to get it right front to back and right to left. now fill it to where the water comes up to the ring where that snout connects to the radiator. just not enough to let the water go out the overflow. take the plug wire off or hold down on the kill switch and have someone kick it while you watch for bubbles. sometimes taking the plug out will show signs that you have coolant getting into the combustion chamber too, and that is almost always a head gasket causing that.
 
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