Originally Posted by Newby
I have a basic knowledge of Honda only. I replaced couple Engines and Transmission on Honda Civic between the year of 1996 - 2000, but I NEVER TOUCH TOYOTA at all.
I just bought a 99 Toyota 4runner Limited 4x4 V6 with 240k miles. It's an automatic. The Engine is bad due to the # 5 Cylinder Block and the Head Gasket. I know it's a big job and painful but, in this case, I plan to get it done by myself. I want to replace the Engine, so I need your help on the steps and pictures if you have them written on somewhere. Thanks.
I'm not sure that there's a complete writeup on a 3.4 swap. Get a FSM or Haynes manual and label, label, label as you go. It's really not that complicated.
Unbolt trans from motor, unbolt motor from bay, unbolt y-pipe (on passenger side, down to exhaust), disconnect cables/hoses/wires, and take out old motor.
Whatever new motor you get, depending upon how many miles/condition, consider doing a timing belt service and valve cover gaskets while you have the motor out. They're much easier to do while you have the motor out. Also, you may as well go ahead and get intake manifold and intake plenum gaskets and some RTV to avoid trips to the parts store.
There are a couple of really nice writeups here on how to do the complete timing belt service.
Then, just reverse the process. I'm not a mechanic, and have only learned on my 4Runner, but with the help of a mechanically-inclined buddy, it took us two days to do the swap. That included trips to the parts store, a couple mistakes (one of which required dropping the oil pan again, scraping gasket again, and re-installing).
As far as tools go, you will need a big 19mm socket to turn the crankshaft pulley bolt, both to do the timing belt service, and to turn the motor to unbolt the flywheel from the torque converter. This bolt is torqued to around 220ft/lbs, so it's hard to get off. If you don't have a breaker bar, you'll likely need one. Even more so for the camshaft bolts (I think they're 16mm or maybe 18mm) which are nearly impossible to get off without a SST or a homemade belt holder tool.
Also, you'll need a lot of socket extensions, with a swivel to get the trans bolts out. They're not fun, but not really that difficult, just tedious. Same for the flywheel bolts.
Also, you'll need a 24mm socket to get the oil cooler off. You may not need this if your new motor comes with one, but mine didn't so I had to swap from my old motor. If you do swap the oil cooler, get a new o-ring and sealing washer. (Look around for the part numbers for these, the o-ring goes against the block, behind the cooler, and the washer goes under the bolt).
With adequate preparation, patience, and the right tools, you can do it. Best of luck to ya!
EDIT: If you do decide to go through with it, post pictures along the way here and if you hit any snags, the kind folks of YT will surely be willing to offer advice.