Community Forums

gballenger · 06-07-2021, 08:49 AM

I have a 2020 Fleetwood Discovery LXE. Floorplan is 40M with main bath all the way in the rear of the rig. I have noticed two things which are a concern. At certain times, while driving, we get the of smell of "burnt" rubber or some other similar carbon based product. It is infrequent and it seems to be when the engine is under a load, going up hill. It seems to be coming from the rear. I monitor the temperature of the oil and coolant, nothing unusual. There is no smoke (no brake or tire problems). When we stop for the night, we have also noticed that the main bath surfaces are covered with what appears to be diesel soot. The rear window is always closed. There is a fan with a cover. I did open and turn on the fan at one point to get rid of the smell. Did not help. One thought is that the diesel soot could be coming in from the fan, but if the exhaust is running, I'm not sure how it could be coming in. Also note that the engine access is through the hatch on the floor.

wolfe10 · 06-07-2021, 09:00 AM

Two basically unrelated checks:

Check the exhaust system for leaks. With a strong flashlight check head to exhaust manifold, manifold to turbo and exhaust system on to where it exits the coach. Any sign of BLACK indicates a leak.

Also, verify that the engine compartment is completely sealed to the interior, including gaskets for access doors to the engine room.

Do not leave any vents back of the front seats open, as they can create a vacuum that can suck in fumes.

And, if dash HVAC system is on outside air vs recirculate, even less chance of fumes getting in back there, as the interior will be slightly pressurized. Probably not a good idea in hot weather with A/C running because you will be bringing in hot air from outside.

Ljwt330 · 06-07-2021, 10:05 AM

Agree with wolfe10.

Where is the tailpipe located on your MH? The discharge location can play a part in if fumes are caught in a low pressure, vacuum zone created by the coach. If engine and manifold checks prove negative, the most likely cause is the open vent or seal on the floor hatch.

Yes, a/c water drip from roof is normal if no drain tubes provided

dfuelman · 06-07-2021, 03:52 PM

You might get lucky and inspect the inside of your coach very closely. Sometimes the soot will leave a trace where it comes in. My coach had a cracked exhaust manifold that had been cracked for sometime apparently, I could see black streaks in the bed room where the exhaust was slowly being pulled in.

johnhicks · 06-07-2021, 07:58 PM

I suspect a cracked exhaust manifold and an engine cover that isn't sealed.

ga traveler · 06-08-2021, 08:47 AM

If this was at our shop, we would start by doing a thorough inspection of the exhaust system. Next would be to use masking tape over the engine access cover edge. If the soot still came in, we would go out at night and use a strong flashlight in the engine compartment and have a second person look for light in the bathroom.