Coolant in valve cover ? Help! - ZX6R Forum
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post #1 of 10 Old 05-07-2017, 11:35 PM Thread Starter
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Coolant in valve cover ? Help!

So long story short I got a 2006 zx6r recently with high miles (37k). After buying it I began some maintenance which included changing fluids and checking valve clearances. So after I got my valve cover off I noticed a drop of lime green antifreeze just to the right of the lifters for cylinder#2 in the center of the case. There is also a small area around it with brown sludge. I had changed the oil earlier in the day and it appeared normal and I also checked the antifreeze which also appeared normal. I have ridden the bike for approximately 70 miles prior to this maintenance and the only oddity I noticed was a rough idle on startup when it was cold. Any advice or experience would be appreciated.
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post #2 of 10 Old 05-08-2017, 03:16 AM
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First. Hello and welcome to the forum. Take a couple of minutes and say HI in the new user area. Tell us about your past rides and pictures of your present.

When you said coolant in valve cover, I immediately thought of head gasket.
The oil looking fine when you changed it is good, how did the coolant look when you changed fluids.
If the oil and coolant looked good when they came out, running and monitoring them is all you can do. Well you could rebuild the engine.
Rough idle, confirm the throttle bodies are synced.
Just thought, the fluids coming out. Did they look fresh as in changed right before you picked up bike.
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post #3 of 10 Old 05-08-2017, 04:41 AM Thread Starter
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Thanks for the reply, I was thinking it was possible the fluids were changed. But also like I said I did ride it about 70 miles after I purchased, if there was a catastrophic failure somewhere I feel like the fresh fluids wouldn't be so fresh anymore. I'm thinking head gasket as well but just trying to cover my basis before I start ripping more things apart, I'd like to fix this while the motor is already partially taken apart if I can.
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post #4 of 10 Old 05-08-2017, 05:13 AM
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Originally Posted by Mattw795 View Post
Thanks for the reply, I was thinking it was possible the fluids were changed. But also like I said I did ride it about 70 miles after I purchased, if there was a catastrophic failure somewhere I feel like the fresh fluids wouldn't be so fresh anymore. I'm thinking head gasket as well but just trying to cover my basis before I start ripping more things apart, I'd like to fix this while the motor is already partially taken apart if I can.
I don't see a head gasket as being able to get coolant 'above' the head..... that gasket seals the head to the block, and the whole mass of the head is between it and the valve cover.

Same thing with valve stem seals, they're isolated form the coolant, so the most likely thing that leaks past them is oil, into the cylinder.

Bright green coolant inside the valve cover seems like it would be very hard to accomplish. I would personally expect a loose coolant line which dripped some in there after you took the cover off......
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post #5 of 10 Old 05-08-2017, 06:05 AM Thread Starter
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It's very possible, what about the sludge around it thought when the rest of the area looks nice and clean. Just a coincidence? Which I'll definitely take
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post #6 of 10 Old 05-08-2017, 07:09 AM
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Two things:

Are you SURE it is coolant? If the PO was using Motul 300V it is lime green and looks just like antifreeze to the untrained eye.

If it is indeed coolant about the only way that it could get up there would be a crack in the head.
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post #7 of 10 Old 05-08-2017, 08:28 AM
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It's very possible, what about the sludge around it thought when the rest of the area looks nice and clean. Just a coincidence? Which I'll definitely take
The lowest point in the space will gather the most crud, due to gravity. If there was some goop at that point, that's perfectly normal.... and why you clean that stuff out when you open it up and inspect.

As Michael said..... you'd have to have a cracked head to leak coolant.... and I don't even know if the head has coolant passages in it.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #8 of 10 Old 05-08-2017, 11:15 AM Thread Starter
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I don't see any direct way for coolant to get there that's why I was so confused, I don't have a ton of experience working on this type of motor. I'm going to go ahead and adjust my clearances and I'll clean everything up while I'm in there. I'm going to do a compression test when I put everything back in just to see if anything peaks my interest.
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post #9 of 10 Old 05-08-2017, 12:01 PM
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I don't see any direct way for coolant to get there that's why I was so confused, I don't have a ton of experience working on this type of motor. I'm going to go ahead and adjust my clearances and I'll clean everything up while I'm in there. I'm going to do a compression test when I put everything back in just to see if anything peaks my interest.
Do the compression test before you start making adjustments..... better to have only one variable in play at a time. Right now, whatever state the clearances are in, they are a constant. Once you pull the cams, change the clearances you can't go back and get that initial state.

If you don't see any change, life is good. If you only check after you set the clearances and it's bad, you'll question your work.
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"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #10 of 10 Old 05-08-2017, 01:37 PM Thread Starter
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Yeah that's a great point
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