Oil in air filter

[Cuppa]

A mate has a normally aspirated TD42 engined Civilan bus, & is complaining that when he recently checked his air filter after travelling a few thousand kms that it had a fair amount of oil in it, on the inside of the filter
He also reckons it blows black smoke with a blue tinge to it & uses around 1 litre per 1000kms.

Can anyone suggest what he should be looking at to rectify this situation? Other than these things the bus runs well.

regards
Cuppa

[Lieney]

Rings? Valve stem seals? PCV valve allowing oil from excessive blow-by into the air inlet & settling in filter housing during deceleration maybe.
I'd clean filter housing & inlet, disconnect crank case breather. Fit catch can type thing or run breather line to atmosphere. Plug inlet where pcv went. Test run a week or so.
Hope it helps

[AB]

As above Cuppa my money would be on blow by too which is common with diesels and putting on the catch can would hopefully sort it out.

[Sir Roofy]

As above mate try the catchcan you saw how it was hooked up
the other day do the same for the bus

[Ben-e-boy]

the pcv on an NA td42 re enters the motor on the intake side of the air filter I some how dont think it would help much it would have to be blowing back out the intake.

[nissannewby]

With that much oil usage it doesn't sound good. Motors in good condition would be lucky to use half a liter in 10k. The blue smoke could be from the oil in the intake so disconnecting it from the intake may help. But I would be getting a compression check done on the ole girl.