4G93T Oil leaking into cylinder 4 exhaust port

[sixcentz]

Currently in lockdown (New zealand) so decided to look into fixing this mitsubishi Libero GT I've had sitting for a while, 4g93t motor which is rather similar to the 4g63

Was blowing a tonne of smoke under acceleration while driving aswel as while stationery, seemed to be fine on idle. Replaced the turbo with no luck, compression test around 160 on all 4.

Upon removal of the exhaust manifold I've come across a tonne of oil sitting in cylinder 4 port, the valve stems are covered also. Leads me to believe the stem seals are leaking which I'll be replacing soon but would like to hear other people's thoughts as I have already swapped the head with another which didnt help, unless it was also stuffed which would be rare.

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[BLACK'98DSM]

Definitely seems like the valve stem seals to me. Wouldn't hurt to have the head completely reworked

 

[pauleyman]

If you're that far apart pull the pistons and look at the rings and ring lands.

 

[spyderman2113]

I'm currently going through a similar situation, my head gave out about a year ago and I replaced with a new (used) one. Now after I Start up and drive a bit and come to a stop it starts smoking but at standard idle no smoke, as accelerating no smoke, as I am rolling it only smokes when I let off the throttle. Any ideas what may be the cause? I have heard turbo, bad valve stems, and of course bad gasket. I didn't do the work myself but I do trust the person that did and everything minus the head was new parts.