biggsbob

I pretty sure i have a blown head gasket and i ran a compression test. My results were
#1 was 190 psi
#2 was 148 psi
#3 was 210 psi
#4 was 210 psi
THe compression tester i used was brand new and not cheap asian garbage. I should be about 170 psi so i have no idea whats going on. The reason i think i have a bad head Gasket because there is some serious coolant in the oil. I need help!

yotaman85

Japanese parts are often allot better then you think, and mostly used on Japanese trucks with far better success. with that said,your compression readings are kinda high on 3&4, but I have seen some that high with no other issue's. if you have coolant in your oil you are on the right track though...

tried4x2signN

coolant in oil can be the timing cover...

biggsbob

i can see coolant/oil come out of the head/block mating surface when it's revved so im pretty sure it's the head gasket. I just read my haynes manual and it told me that the standard comression is 178 psi.

Pumpkinyota

My question is = you have diagnosed your problem so far, what do you need help with?

You don't have "low" compression, these motors will run (albeit it poorly) at 90 PSI. If you see coolant and oil coming out of the head/block interface, that is a certain problem. That is caused either by a blown HG or a warped head, or both. Time to yank that head. Did you overheat it recently? You might want to take that head to a reputable machine shop, have them magnaflux it, check for leaks, check warpage, etc.

While the head is off, for the love of god, pull your TC cover and change your timing chain and guides. While you are at it, switch over to a dual row timing chain, and steel guides, this won't change the cost, and will make a world of difference in the future. Check the TC cover for signs of chain wear while it's off, replace it if you see any. And for sure, make absolutely certain that you clean all your old gasket material off really well when you re-assemble, so you don't have another failure in the future. Also, re-install following the FSM's proceedure for head bolt tightening order, to make sure you don't warp your head while torquing it down. Good luck!