Oil spitting out of dipstick tube and breather valve hose
Hi everyone,
I have a 1985 Mitsubishi Pajero I bought a couple of months ago. It has a 4D56 Turbo engine. Now, I've been having the basic issues one has with older cars, and so I took it to two different mechanics. Both have said that I needed an engine overhaul. Their reasoning was that there is blow-by and this is evidenced by the fact that smoke and oil spits out of the dipstick tube and the breather valve. I asked the second mechanic who told me this whether he could conduct a compression test, and he said he didn't need to because he knows the compression is low.
So I bought a compression testing kit, and found that i had pretty solid results with a dry test. Cylinders 1, 2, and 4 all had compression of 420-430Psi, with Cylinder 3 having about 390Psi... While there is a bit of a difference between 3 and the others, the number is still high enough for it to be a good reading. This made me stop thinking of the issue as strictly blow by caused by either worn pistons/piston rings/cylinders. But there does seem to be some pressure from the crankcase. I suspect it could be the turbo, or maybe the rocker/valve cover needs changing?