by SPASE » Thu Sep 12, 2019 7:55 pm
Basically I am trying to figure out something... I had the rear main seal replaced on my bighorn 4jg2, it soon started leaking again so I took it back and they replaced it with a genuine isuzu seal thinking that would do the trick... It didn't.. Started leaking straight away. I was thinking maybe the pcv valve or breather was blocked causing a build up of pressure in the crankcase causing oil to pass through the seal.
It does have a oil catch can fitted but doesn't seem to be pushing any oil into it like it used to do. If I lift the engine oil filler cap while engine is running it has a significant amount of blowby.. Enough to blow the cap off if sat on the hole. It has had a complete engine rebuild and only travelled roughly 80,000kms since that so I didn't think it could be the rings.