Strange oil burn.... (1 Viewer)

[bigboiimigel]

Hi, everyone, it's me again,

My '85 FJ60 has been burning oil nonstop since the day I bought it. It's like, really bad. All of my cylinders are around 150 psi of compression, PCV is working properly, and I am not sure why it is burning an excessive amount of oil. If I really step on it leaving from a traffic light, it will literally blind the driver behind me. Any help is appreciated.

 

[OSS]

If the cylinder head valve stem oil seals are shot, it'll burn oil like there's no tomorrow

 

[bigboiimigel]

Thanks. Any other reasons why it would burn a ton of oil?

 

[Seth S]

Do you have a big cloud of blue smoke behind you?

what are you running for oil?

 

[pithicus]

Really smokey after cold start or after idleing at lights sounds like seals are bad.
Less likely to be piston rings .
as for replacing the seals, there are ways of doing it without removing the head . "rope trick" for example.
Also if the oil gets really dirty quickly it can point to bad piston rings.

 

[Trapper50cal]

Good compression across the board would seem to eliminate "blow by" from worn rings.
But take a look inside the air cleaner assembly where the air filter rests...is there oil in the bottom?

 

[Seth S]

You could have good compression rings and bad oil scrapers or a bad oil scraper in one cylinder.

But I think the stem seals are more likely

 

[bigboiimigel]

I am not sure what oil it is, but I know it is the factory spec. Leads me to believe it is the seals in cyl #2. Always have to clean oil and grime off of that spark plug

 

[pithicus]

Leads me to believe it is the seals in cyl #2

seal/s might have popped loose from where pressed on to the head. Or cracked badly
Or maybe the head gasket is dodgy allowing oil to pass to no 2 cylinder?

 

[bigboiimigel]

Not sure. Thinking about one of @FJ60Cam HiPo rebuilds this winter so I’ll get it checked out then.