Exhaust Leak Volvo 670

The 'road draft tube' carries away blow-by from the crankcase... blow-by is the combustion gasses that sneak past the piston rings and enter the crankcase. Your 4 wheeler has a PCV valve that captures those gasses and rerouts them into the intake manifold to be burned.

A diesel doesn't generate any vacuum so there's no way to have the gasses re-enter the engine via a vacuum so they are dumped into the atmosphere via the road draft tube.

If you see a considerable amount of vapor coming from the tube it's a sure sign that the engine has worn piston rings... over filling the engine with oil would not produce any more blow-by.

 

Piston rings and cylinder liners are made of iron...

 

Also check turbo and intake for signs of dirt entry, possible dust damage resulting in worn rings and liners / high iron levels.

 

Rings will usually show a high chromium level as well as iron.

 

True...if the rings are chrome rings... some are plasma moly or just plain moly. The oil rings would be chrome I think.

You'd also get a high iron reading if there wasn't enough side clearance on the connecting rods but that's unlikely in a high mileage engine.

 

I have the same problem and I have a Volvo 670 Volvo engine I bought in 2009 and now has 281000 miles up to now and this oduer or fumes started with 200000 mile and me and my dealer started looking to this problem and we are still looking in too we did a test of exaust system and we check all the exaust we did not see any thing rong but it keeps doing,this problem for me started when I send the truck to do the clean to the DPF filter,even last week the smell was so bed that I bleed from my nose I had to drive with windows open.IS THIS WHAT YOU ARE FILLING TOO LET ME KNOW