Exhaust Leak Volvo 670

That tube is the CCV or Crank Case Vent tube. That little bit of oil and fumes is normal. Now for the fumes going into the cab I would lean more towards an exhaust leak on the truck because the CCV does not smell like normal exhaust fumes since it is venting out the crankcase. Smells more like hot diesel engine oil.

 

flashlight and mirror in hand, look for black soot on the pipes. joints , and welds are your most likely places. johnny

 

You have a leak on the exhaust manifold, turbo, or exhaust system. I would do what
lastgoodusername said.

 

check the pipe section behind the turbo sorta under the cab firewall, it's a pain to get a mirror up there to examine it, but mine cracked on my 780 last summer.

 

With the engine running Get a helper to put a clip-board or something over the exhaust pipe (to block it) while you look , feel around and listen at all the connections and pipes.

 

It's almost certainly gotta be between the turbo and were it exits to go verticle. Time to break out the coveralls..

 

check under the dash, there should be several air valves that look like sending units. i had a parking brake valve leaking air into the cab, smells just like exhaust. spray some soapy water on them. may be the problem.