thanks smartass. this is time dependent situation for me as i need this vehicle runnin and drivable within two days...

 

Might be able to drop the oil pan and the crank and pull them out

 

OR GO GO GADGET FIX ENGINE. HAHA

I would pull it out and take to machine shop and bore it out, polish or cut crank and rebuild. from the looks it should be fine to rebuild with new pistons.

 

hmm ok thanks. is there a way i can just pull the head, and the pan . unbolt the pistons from the bottom and push them out the top?

 

Yes thats the way to do it. Ive done that on a few chevy engines.

 

ok thanks. probly replace an o2 sensor while im in the engine anyways...

 

The 02 sensor is on the exhaust manifold, if you dont replace it just clean it.

 

Ya I don't see why not. they would come out the same way if the block wad up in a engine stand

 

100% Right on that.

Does anyone know if the pistons have press in pin bushings or the snap ring type??? I havent done the 4.0 engine yet

 

Now that I don't know about. And haynes book don't say anything. Sorry I can't help you there

 

yes i have been known to be a smart ***...two days? good luck. probably quicker to just buy another long block....thats what i would do. 4.0s around here are a dime a dozen...but i dont know your tools/time/space/cash/knowledge situation either.

 

"rings and rod bearings" use to be done in the old days. (are these them again?) Gotta' remove the ridge with a ridge reamer. Hone the cyls. You are not messen' with the wrist pins, just new rings. Instal matching rod bearing inserts.

Pour kerosine or diesel in the ports with it dry, (with them up), look for even seepage. Got one pissen? Might need another valve. Exhaust valves "slump" at the edge, or crack first.

Since you want to change the valve stem seals, (that come in the head gasket set), you can lap the valves with valve grinding compound, a short section of fuel line (clamped on the valve stem), and a drill. Gently, going both ways. Not too much. Clean, clean, clean! Might consider a new oil pump.

My .o2! Yea...other things come up!

 

Stock is press fit.

 

Dude I love it "abracadabra" LOL!

 

Did that once on a yota yeah bad idea but it was a good laugh later.