CBR 600F 1987 - 1990 CBR 600F Forum

Small leak in Head Gasket?

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Old 03-27-2013, 10:58 AM
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Default Small leak in Head Gasket?

So a couple months ago my 600 Hurricane started leaking fuel from the carburetor float bowls. Recently I finally got around to fixing it after my replacement float bowl gaskets came in the mail. After replacing all four gaskets no more leaks, all good. However yesterday after riding for a while I noticed a small amount of green fluid by a seam in the engine block on the exhaust side. It smells and looks like coolant so I'm assuming that's what it is. This is a very recent leak and possibly due to me revving the bike a little too high ( only 10K) after not running for a while.
My question then.... Is there a cheap way to fix this other than replacing the head gasket? It is such a localized leak that maybe some form of patch could work, if that even exists? Or maybe a Bar's Leaks product? It appears to be leaking from a seam in the engine below the head gasket however... I will upload some pictures in a bit.
Thanks for any help/advice.
 
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Old 03-27-2013, 02:03 PM
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Even if bars was to stop the leak its not a permanent fix until the gasket is replaced....
 
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Old 03-27-2013, 04:17 PM
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I wouldn't use any type of stop leak in it. I've seen what that stuff does to a cars cooling system. I had to replace the radiator (because of the pinhole), heater core and have the block hot tanked in the mustang I bought because the kid put stop leak in it. The passages are pretty small on the hurricane engine I'm sure it would plug them up and make things worse
 
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Old 03-27-2013, 06:52 PM
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I'm with Ben. Stop leak is bad stuff. It will plug your radiator and then you'll have big problems.
 
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Old 03-28-2013, 12:33 PM
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I agree as well.. if it's leaking from the head gasket it probably wont work either. Post up some pics and let's see where it is leaking from first.
 
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Old 03-29-2013, 05:09 PM
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Upon further examination I saw the leak was coming from an intake tube into the engine presumably from the radiator. After running for a while a small amount of green fluid starts to come out from under the bolt, see picture. It leaks down and "pools" in those seams in the engine , not actually leaking from there though. It seems like this bolt/connection is easy to get to, just pull of tank/air filter. Is there a gasket of some kind on this connection that can leak? Should I just try to get this bolt off see if there is something obvious?
 
Attached Thumbnails Small leak in Head Gasket?-overview.jpg   Small leak in Head Gasket?-intake.jpg  
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Old 03-29-2013, 07:27 PM
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Those pipes have o-rings on them. I just had to replace mine from where its been sitting. It's an easy 5 minute fix if thats what is leaking
 
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Old 03-29-2013, 09:06 PM
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It's probably the o-rings, mine started to leak after I bumped the pipe with my arm working on my bike. Check the hose clamps on the other end of that pipe too.

edit- to replace the o-rings drain coolant and unbolt & remove the pipe from the head. I used a small amount of coolant safe RTV in addition to the o-ring for extra security with mine. Then just refill & bleed the cooling system and you're done.
 

Last edited by TahoeRider; 03-29-2013 at 09:15 PM.
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Old 04-03-2013, 08:27 PM
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OK, so I replaced the O-rings and fixed that leak, however after refilling the coolant system and putting everything back together my bike wont start. It cranks over fine but wont fire. The carbs are wet and all fuel lines are connected so Im assuming it is an issue with the spark, although I dont know what I could have done to hurt that. I am planning to check the spark tomorrow but any ideas on why it wont start or why the sparks plugs suddenly crapped out?
 
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Old 04-11-2013, 05:11 PM
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Thanks for the advice all, leak is fixed and turns out I had accidentally unclipped an ignition wire.
 
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