Overheating Issue - Yamaha R6 Forum: YZF-R6 Forums
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post #1 of 14 (permalink) Old 06-04-2019, 04:09 PM Thread Starter
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Overheating Issue

My bike is overheating! Temps getting up to 240!!!! Fans are turning on at 210 but it doesn't help. Doesn't cool down even when moving. thermostat is good. New radiator cap. No blockage in teh radiator. I then noticed a small water drip coming from the oil pan! Oil looked ok. Is it possible I have a bad head gasket? any other ideas?
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post #2 of 14 (permalink) Old 06-04-2019, 04:24 PM
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I would drain some of the oil out and look for a white milky substance in it. Fingers crossed it’s not that.

How many km on the bike?
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post #3 of 14 (permalink) Old 06-04-2019, 04:56 PM Thread Starter
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Re: Overheating Issue

already drained the oil and it looks good. I have a leak at the thermostat. I don't see a gasket on the cover or in the parts diagram. should there be some type of sealant on this cover?
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post #4 of 14 (permalink) Old 06-04-2019, 04:58 PM
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Re: Overheating Issue

what year bike is it, i'll try to find some info.
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post #5 of 14 (permalink) Old 06-04-2019, 05:16 PM Thread Starter
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Re: Overheating Issue

Its an 08. The drip at the oil pan is of course from the leak at the thermostat! I panicked and thought the worse! Why the hell is the water not cooling down? Bad radiator?
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post #6 of 14 (permalink) Old 06-04-2019, 06:00 PM
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Re: Overheating Issue

did you pressure test the cooling system??? Real easy to tell if the headgasket is holding. 2008... did you check your waterpump impeller?? They go bad
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post #7 of 14 (permalink) Old 06-05-2019, 06:37 AM Thread Starter
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Re: Overheating Issue

I pulled the cover on the water pump and checked the blade and that it spun freely. No issues there. I guess pressure testing the cooling system will be next. If head gasket was bad shouldn't I see this in the oil? Or coolant bubbling?

Last edited by nytrozula; 06-05-2019 at 07:43 AM.
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post #8 of 14 (permalink) Old 06-05-2019, 07:54 AM
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Re: Overheating Issue

not necessarily. The pressure test is to see if there is a way for air to enter.
Could be a bad clamp, cracked jacket, or broken over flow. Im gona bet a small crack.
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post #9 of 14 (permalink) Old 06-05-2019, 08:16 AM Thread Starter
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Re: Overheating Issue

small crack? where? in the block? Is a pressure test going to detect this? And would this be the reason the bike is overheating so badly?
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post #10 of 14 (permalink) Old 06-05-2019, 01:25 PM
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Re: Overheating Issue

Quote:
Originally Posted by nytrozula View Post
small crack? where? in the block? Is a pressure test going to detect this? And would this be the reason the bike is overheating so badly?
A pressure test will determine IF your cooling system can hold pressure.
If you add pressure to the system... let it sit overnight it should be the same in the morn. The system has to be full of fluid.

You could have a small crack in the water jacket. Seen this happen on a race bike. Basically it will weep a small amount. You could have a failing hose. You could have a bad water pump... lots of things. Might take a good flat rate guy about 2hrs to figure out.
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