Topic: quick compression question

[NCK4L]

so my truck has 60 lbs of pressure in #2 cylinder when i pulled the plug and put a teaspoon of oil in it it jumped up to 80. I then put the plug back in it and fired it up for a minute and compression dropped back down to 60. I was told this most likely means i have bad rings. Do you guys think thats the case? or could it still maybe be in the top end like H/G or the head itself. The truck was over heated and has been sitting for about a year. it is  a 22re. Thanks for any help.   

[*ROKTOY*]

Could be rings, valves, head gasket or a combination of stuff. With just a 20lb increase with oil sounds like its time for a new engine. Pull the head and check it out.

[NCK4L [OP]]

Could be rings, valves, head gasket or a combination of stuff. With just a 20lb increase with oil sounds like its time for a new engine. Pull the head and check it out.

cool thanks. i think im just gonna drop a new engine in it i have one here ready to go i think that would be the easiest thing.

[jeff94runner]

I'm not an expert, but I would lean toward rings or cylnder wear.

[79coyotefrg]

whats the compression on the other 3 cylinders
if they are 140 or so  i'd say its a bent valve or headgasket

[peacesells]

60 is a bit low for bad rings, have to have some chunks missin for compression that low. I would say burnt up or bent valve, that what my buddies with similar compression had.

[Skinny_Pedal]

were all the spark plugs out?

[toe]

WOT throttle?

[NCK4L [OP]]

all of the other cylinders were around 130. i checked compression by pulling one spark plug at a time out.

[NCK4L [OP]]

P/O said the truck kept overheating on them so instead of fixing it they parked in a field. thats where it sat for about a year and a half untill i got it a little while ago. The starter wouldnt crank it over originally either i thought it was siezed but after messin with it i got it to finally turn over.

[kneedownnate]

That's how my 81 was after the head corroded far enough so coolant blew past the sealing ring on the head gasket.  Sat for a while and seized, bumped it in 5th gear to break it loose then drove it some more    Changed the head and the cylinders looked like they'd been sand blasted, but after driving it a little while it still had over 150 psi in each cylinder.

Probably better off doing like you said and just drop a better engine in it, then you can go back through this one at your own pace, find a real problem and fix it without being hurried.

[NCK4L [OP]]

That's how my 81 was after the head corroded far enough so coolant blew past the sealing ring on the head gasket.  Sat for a while and seized, bumped it in 5th gear to break it loose then drove it some more    Changed the head and the cylinders looked like they'd been sand blasted, but after driving it a little while it still had over 150 psi in each cylinder.

Probably better off doing like you said and just drop a better engine in it, then you can go back through this one at your own pace, find a real problem and fix it without being hurried.

yup i think thats what im gonna do it will definitly be faster

[kneedownnate]

Sounds like now would be a good time for bigger stainless valves and some porting    Oh, and pop for a toyota head gasket, you won't regret it!  They're actually not much more than a felpro and are muuuuuch better.