Engine dirt

On our Newmar the exhaust didn't come straight out - it curved to the side. We never had soot on our Jeep in 80,000 miles towing. Does yours come straight out?

Carl (OP),

We need more information in exactly what it is that you are finding on the car-- as you can see, lots of speculation on possible sources.

Can you fill us in on exactly what it is or at least describe it.

gbopp wrote:

Jim & Betty wrote:
That is tire dust thrown off by your and others tires as you go down the road you throw a little bit of tire, kinda like drying the clothes and you clean out the filter that is a little bit of your cloths.
JimR

Why does the tire dust accumulate only on the right side of the toad?

Because that is where most of the tire dust is.

Yea I got to thinking about this and I think it may be a crankcase vent.

JimR

I've pulled a white car 40,000 miles all over the country and never noticed anything like that so I don't think it is from the road.

Sam Spade wrote:

Could also be a sign that you tend to hug the right side of the lane and pick up road dust that other vehicles miss.

This is what I was thinking.

The travel lanes stay relatively clean due to the amount traffic using them. Therefore, the left side (if you are a right lane traveler) would not see as much dirt.

All that dirt has to go some where. That right shoulder gets pretty dirty. Maybe, just maybe.....you ride that right lane, give a wide birth to traffic passing you---wander a bit, etc... (scoot over into the dirt).

HOWEVER....black SOOT is not DIRT. I'd be looking on that side of the coach and engine compartment as well. Like others have said: An oil soot may be coming from the crankcase breather or even diesel blow-by from the turbo.

SORRY...I think it is technically a blow-OFF valve, not a blow-BY valve. Blow-off & blow-by mean two different things to the die-hard diesel crowd.

Closely check the tires and brakes on the right side......of BOTH vehicles.

Could be brake dust or tire particles from a friction rub or one badly out of alignment.

Could also be a sign that you tend to hug the right side of the lane and pick up road dust that other vehicles miss.

Often a rubber hose (slobber tube) is put on the crank vent to keep it from clogging the radiator. Check to see if you have one and if it's routed to the right side although most crank vents in a DP are on the left. IF this is your problem then I would reroute it to just in front of the exhaust so the exhaust blows it further out on the left or turn it downward so it goes under the car. I have my doubts this is your problem because it's on the right of the car unless you have a side radiator.

*Looks like you do have a side radiator and I doubt you have a slobber tube. The air from the radiator fan may be blowing the crankcase mist to the right side of your car. I would add 6' of rubber hose to the vent and have it come out in front of the exhaust.

palehorse89 wrote:

Carl Niezing wrote:
We are pulling a white car behind our MH (Country Coach Allure) and when we travel about 500-1000miles have a black soot all over the right side of the car while the exhaust is on the left. Am mentioning this to say "it is not the exhaust causing this".
Any help or suggestions?

What engine do you have? I am wondering if it is residue from the crankcase breather? Is it oily at all?

i agree with palehorse, the other don't make any sense.

Carl Niezing wrote:
We are pulling a white car behind our MH (Country Coach Allure) and when we travel about 500-1000miles have a black soot all over the right side of the car while the exhaust is on the left. Am mentioning this to say "it is not the exhaust causing this".
Any help or suggestions?

What engine do you have? I am wondering if it is residue from the crankcase breather? Is it oily at all?

Jim & Betty wrote:
That is tire dust thrown off by your and others tires as you go down the road you throw a little bit of tire, kinda like drying the clothes and you clean out the filter that is a little bit of your cloths.
JimR

Why does the tire dust accumulate only on the right side of the toad?