So nobody else makes the potentially horrible mistake.
We did a bunch of re plumbing on the Webasto and engine cooling interchange loops. We bled the systems. Or we thought we had them bled. This was a few months ago and never gave it another thought. We have had the engine running for periods of time on many occasions since, although we haven't actually driven it any where. Always stayed very cool.
So off on a test drive to find clear sky to test the TV satellite system.
About a half mile from home, there is water rolling out the back of the bus. Check the temps, pushing 195 and still rising! Quick, find someplace to stop and cool. Maybe we didn't fill the surge tank, we thought we did. Started pouring water in the surge tank, temp drops to 180. Good to go. In less than a quarter mile, repeat. Water pouring temp rising. Pull over again.
Got to thinking about air lock in the engine at this point. Tried to bleed the little valve on top of the cross over. Nothing happens. Needle valve stuck. Next a wrench and take it out. A huge gush of air came out. Yep, air locked. Poured water in the surge tank until it came out the hole. Put the bleeder valve back in. Added some more water to the surge tank. Cured!!
We are going to need a new bleeder valve. This could have been catastrophic. Lucky we had someplace to pull off quick and enough water in the tanks to refill the system.
Don and Cary
1973 05 Eagle
GM 4107
Neoplan AN340
Don and Cary there is a plug in the upper tank on Eagle to help with bleeding on a Eagle also sounds like you have it covered
After looking at the manuals, it appears we need to run another line between the surge tank and the engine. The only connection is the big tube going down to the bottom of the engine. There is an overflow hose that drains on the ground. That's were all the water came from. None of the other holes on the tank are hooked up to anything.
If we attach a line from the cross over to the surge tank, that would keep the engine bled, right?
Does anybody have a picture of how their surge tank is plumbed. The manual has a very weird looking diagram.
Don and Cary
1973 05 Eagle
GM 4107
Neoplan AN340
You should have a 3/8 line from about the middle of the tank going to the top of the thermostat housing on the left side one tap should have the 7 lb relief valve it is on the top some had a low coolant sensor on the tank drivers side under the fill neck on the end of the tank, the rest of your setup sounds right
good luck
I guess we will put that line on then. There is an old radiator style cap on top the tank. It looks like it has been there since day one. Haven't tried to take it off. Since the coolant is draining out on the ground, guessing the cap isn't doing anything anyway.
Thanks for the info
Don and Cary
1973 05 Eagle
GM 4107
Neoplan AN340
Owners replace the flip cap with a radiator cap it takes the place of a relief valve and the leaking flip lid not a bad setup IMO it had a flip cap originally