HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Lok47

Coolant issues part 2

9 posts in this topic

I posted a couple of weeks ago about how my WR400 is shooting coolant into the resevoir. I got a few suggestions that I should change out the radiator cap because it could be old and worn. So I did that and it is still doing the same thing. My roommate is telling me that it is probably my head gasket (I re-used my old ones since I was in a bind). They are cometics, so i figured it would be okay. I'm think that may be the problem, but I want to rule out any other possible alternatives that could be causing my problems. Anyone have a clue? The coolant is not returning back into the radiaotrs, it just sits in the resevoir once it's in there. I'm running engine ice on a 2000 WR400 and it is currently 90* here. Any and all help is appreciated!

Share this post


Link to post
Share on other sites

It's overheating. It should suck back into the radiator after it cools. When you pull the rad cap can you see coolant?

Share this post


Link to post
Share on other sites

Well it's been about 5 hours since I've ridden it and the coolant has not been sucked back into the radiator. Why is this? Is there supposed to be a return line to the radiator? I only have one line running between the radiator and resevoir. When I opened the cap, there was a discharge of pressure. Is this normal after letting it sit for 4-5 hours?

I looked into the radiator and this time i was able to see the coolant sitting on the fins, but last time I was not able to. Keep in mind, I only road it around the neighborhood this time. The last time it did this, I was running it at the track, so it should have been running much hotter then compared to today (that was when I wasn't able to see coolant in the radiator).

Share this post


Link to post
Share on other sites

so let me get this straight. You have already pulled your head off and reused the existing head gaskets?

Share this post


Link to post
Share on other sites

dude I think you need head gaskets. if you opened the resevoir and ther was pressure you have a cracked or damaged head gasket. my suggestion replace them. this means that you head pressures are too high building too much pressure in the res...

Share this post


Link to post
Share on other sites

Yeah, last time i had the head off, I reused the gasket because of time constraints. When i removed the cap on the radiator, that is when there was pressure released, not the resevoir. Sounds like it is the head gasket, right?

Share this post


Link to post
Share on other sites

I could be all wet but.... Whenever I experienced a blown or leaking head gasket in a car, it always sucked the coolant out of the radiator/reservoir and blew it out the exhaust pipe. The symptom being, you need to constantly refill your reservior. When you took the head off, you obviously had the radiators drained, right? I am thinking that when you refilled them you didn't get all the air out of the system and therefore you are low on fluid causing the system not to work properly. Most bikes I have played with required "burping" them when refilling with coolant. Try this.... top off the reservoir if needed, take the radiator cap off and start up the engine. Let the bike get warm enough to open up the thermostat. You will probably see the coolant level go down in the radiator. Have some coolant ready and top off radiator until until it will take no more. Put the cap on and shut off the bike. Keep an eye on the coolant level over the next few rides, topping off as appropriate. That may solve your problem!

Hope this helps!

Bob

Share this post


Link to post
Share on other sites
dude I think you need head gaskets. if you opened the resevoir and ther was pressure you have a cracked or damaged head gasket. my suggestion replace them. this means that you head pressures are too high building too much pressure in the res...

That would be impossible unless the overflow tube is blocked on the reservoir, not the tube from the radiators to the reservoir, but from the reservoir to the ground. :thumbsup: Check your tube routing to see what I mean.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0