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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 3 Weeks Ago
azrescue azrescue is offline
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Default Smoke/vapor from under radiator on a Newell with a 60 Series

Ok, so a good friend has a 2002 Newell with a 60 series Detroit (not a Bluebird, but hey, I'm not one to judge!). They recently noticed some smoke from behind the tag axle while driving, but not when stopped. He asked me to help him figure it out.

Yesterday, we took some video of the smoke on the highway. It appears to be coming out directly under the forward side of the radiator, but it's hard to know for sure as I suppose there is a lot of turbulent airflow in there. The engine and radiator appear dry anywhere we could see when stopped...

I offered to drive it and let him ride in the engine bay to inspect it, but for some odd reason he declined.

Anyway, here is the video:

https://youtu.be/Dsz20HeMNnE

Anyone seen a similar issue? Our best guess is that it's coolant vapor from somewhere near the radiator that only leaks under power.

Thanks!
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Patrick and Stephanie Barrett
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  #2  
Old 3 Weeks Ago
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SNOWBIRD SNOWBIRD is offline
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Just guessing but.......if not the radiator, could it be Water leak from a fresh water overflow? Or, dump valve? Or Air conditioner condensate plumbed down there?
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Old 3 Weeks Ago
InfiLights InfiLights is offline
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That bus is leaning to the left....are you sure it is not rubbing on something or exhaust touching something made of rubber ?...Should still smoke after it is stopped....
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Old 3 Weeks Ago
rshrimp rshrimp is online now
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Hard to tell for sure but it looks more like a water leak than smoke to me.
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Old 3 Weeks Ago
badandy badandy is online now
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Yeah she's leaning, that's the first thing I noticed!
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Old 3 Weeks Ago
azrescue azrescue is offline
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Thanks guys. Yea it does look like it's leaning a little to the left in the video. Some of it could be the wide angle lens on the GoPro. Regardless, he definitely has issues with his height adjusting valves. Whatever kind he has are very slow to respond, and it REALLY leaned to the left when he steered right for the exit. Makes me wonder if all the bags are airing up.

Anyway, good thoughts to check. Thanks gents.
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  #7  
Old 3 Weeks Ago
GregOC GregOC is online now
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;aqua hot exhaust , ;gen exhaust, ;park brake spring bleeding. ;radiator overflow.

1- try running with rad cap off.
2- try to add an extension tube on the blow by tube to other side.
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Old 3 Weeks Ago
Robert Britton Robert Britton is offline
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The way its leaning is the left rear mud flap making momentary contact with the pavement as the coach is bouncing along??
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  #9  
Old 3 Weeks Ago
InfiLights InfiLights is offline
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May want to check the hoses on the other side of the radiator. There is a visitation panel on the left side of the side radiator as you look at it.



You would have to open the side door fully and take the panel out.

If any of those bottom hoses are not tight over the pipes, you may have antifreeze leaking on the exhaust. As soon the system is pressurized they may leak. That is a potential fire hazard. The antifreeze has glycol in it and will ignite.
Tough to get there without removing some parts of the fan drive box and belts but doable. You have special hose clamps there.
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Old 2 Weeks Ago
azrescue azrescue is offline
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Thanks guys,

As a follow up, it had recently been worked on by a Detroit Diesel shop in FL. We found loose clamps on one of the radiator couplings behind the radiator. It's not a smoking gun per se, but hopefully that cures it.

I appreciate the help!
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1995 37' BMC

FMCA F469045
EAA 404878
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