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Old 01-23-2013, 06:10 AM   #1
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black soot on coach and toad

We have been traveling from Seattle to Florida and our toad and back of coach is covered with black soot. Any ideas on wat is going on?
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Old 01-23-2013, 06:40 AM   #2
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What are you driving ???? Is it a diesel pusher?
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Old 01-23-2013, 06:52 AM   #3
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Quote:
Originally Posted by lindaemory View Post
We have been traveling from Seattle to Florida and our toad and back of coach is covered with black soot. Any ideas on wat is going on?
I would check the clamps on the exhaust system including the clamp that connects the turbocharger output to the exhaust system. I had a clamp fail and it allowed exhaust (soot) to cover the entire engine compartment and the rear of the coach.
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Old 01-23-2013, 07:20 AM   #4
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welcome eh! need more info on your coach(cat or cummins engine) have you been idling the engine a lot?
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Old 01-24-2013, 07:33 AM   #5
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soot on toad

We are driving an alpine diesel pusher, cummins engine, side exhaust.
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Old 01-24-2013, 07:54 AM   #6
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Lindaemory
Diesel engines produce soot in the exhaust. Look at truck exhausts pulling up a steep hill. The rear of the Alpine produces a low pressure area when traveling down the road and this sucks exhaust fumes into the rear and toad area and if there is any soot it will deposit it on the rear and the toad. This may not be just your exhaust but any trucks you are following down the road also. On a long trip like yours I would expect some soot deposits so it is a matter of what is normal. If you do not see black exhaust fumes when you are pulling a steep hill then I think you are OK. If your coach does produce black smoke then you may have a problem with the turbo pressure (leak in the CAC?) or you are getting too much fuel to the injectors. In this case you may want to get a check up at Cummins.
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Old 01-24-2013, 09:06 AM   #7
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If you notice some soot, particularly on acceleration, you may want to check your air cleaner. But before you take the air cleaner out, check the restriction gauge which is in the compartment with the batteries. It would greatly help if you posted your coach year & model with your information.
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Old 01-24-2013, 12:03 PM   #8
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These are all good guesses--here is another: if the soot is excessive [in your opinion] you probably have a problem. How is your fuel mileage--poor? Lots of soot means unburnt fuel so either a fuel system problem or a turbo issue. You may have a turbo-side leak [piping or CAC]--so you are loosing boost and dumping unburnt fuel. Keep us posted on what you find.....a
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Old 01-25-2013, 12:12 PM   #9
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Originally Posted by lindaemory View Post
We have been traveling from Seattle to Florida and our toad and back of coach is covered with black soot. Any ideas on wat is going on?
Hi Linda, I am a retired cross country trucker. We have a 99 Alpine. My toad gets completely covered with soot. The engine runs great, it does not soot up in the engine compartment. It does just over 9 mpg at 65mph with a toad. The exhaust is mounted low, air turbulance sucks the fumes upward, especially when compared to big trucks. I notice that mine does not soot up the toad after we have been driving for a while. I think we have moisture in the exhaust, when we drive the exhaust expells the moisture taking soot with it and depositing it on our toad and rear of the coach. When I leave this trip and going to have my wife follow with the toad for 10 to 15 miles, this will get the moisture out of the exhaust, then hook up and see what happens. Maybe this will help you?? the old trucker
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