BAC Forum

General Boards => Technical Support => Topic started by: Karl Welhart on July 08, 2012, 02:32:27 AM

Title: Unusual Exhaust Smoke
Post by: Karl Welhart on July 08, 2012, 02:32:27 AM

Traveling today under very hot outside temps (over 100 degrees) and over many steep climbs on I-64 through West Virginia and western Virginia, I noticed a large amount of smoke on my exhaust pipe, under the edge of the basement door above the exhaust, and on the rear flap.  

I did get coolant temp of 217 on my Silverleaf and noticed a warning light flashed a couple of times on the dash during one of the steep climbs.  Did not get any error codes on Silverleaf.  Anyone have any ideas what caused this unusual amount of exhaust smoke?

Title: Re: Unusual Exhaust Smoke
Post by: LarryNCarolynShirk on July 08, 2012, 05:28:03 AM

You may want to shift down a gear and reduce speed, when the temp. goes over 200 degrees.  Warning lights are telling us something.

Larry

Title: Re: Unusual Exhaust Smoke
Post by: Karl Welhart on July 08, 2012, 01:06:35 PM

I was at 2300 rpm and at 35mph.  Not sure if I can do any better.

Title: Re: Unusual Exhaust Smoke
Post by: Bill Stireman on July 08, 2012, 01:39:00 PM

The last time I had that problem it was caused by a stuck pac brake.

Bill Stireman
'04 Monterey Laguna
400 HP C-9 Cat

Title: Re: Unusual Exhaust Smoke
Post by: George H. Wall on July 08, 2012, 02:15:20 PM

A restricted air filter could be your culprit, check nit fiest!!!  HENRY

Title: Re: Unusual Exhaust Smoke
Post by: Frank Bannert on July 08, 2012, 06:36:06 PM

Try adding some Sea Foam to the fuel. This will clean the injectors and may make it run a little cleaner. You will need app. 2 cans if the tank is near 1/4 or lower and add this to fuel before filling the tank. It made my rig run better. You can purchase it at truck stops or Wal Mart or auto parts stores. Only a suggestion.

Title: Re: Unusual Exhaust Smoke
Post by: Karl Welhart on July 08, 2012, 10:06:00 PM

How can I check to see if the PacBrake is sticking?

Title: Re: Unusual Exhaust Smoke
Post by: Tom and Pam Brown on July 08, 2012, 10:29:50 PM

Could you have been seeing overflow from the radiator and exhaust smoke?

Title: Re: Unusual Exhaust Smoke
Post by: Karl Welhart on July 09, 2012, 12:31:51 AM

No, never lost any coolant.  I do think the problem is with the PacBrake.  I had a simular problem a couple of years ago in the mountains of New Mexico and Colorado.  I suspected the PacBrake was the cause.  This time it is much worse...

Title: Re: Unusual Exhaust Smoke
Post by: Bill Stireman on July 09, 2012, 12:31:59 PM

When it happened to my coach I just turned off the pac brake and the problem cleared up.  There is a special pac brake lubricant you can apply to make sure it does not hang up again.

Bill Stireman
'04 Monterey Laguna
400 HP Cat C-9

Title: Re: Unusual Exhaust Smoke
Post by: Richard And Babs Ames on July 09, 2012, 11:17:36 PM

In our case the hydraulic fan seal was leaking on high speed. It will leave a fluid film. Hope it is simpler than that.