Hello everyone,,

I have a 1996 Toyota 4runner Limited Edition 4WD V6. It has 225,000 miles on it.

I started my engine yesterday and I see white smoke out of tailpipe.
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I only idle 4runner for 2 min.

I like to replace the head gasket. Is there a step by step instruction in this website. I search it but didn't come up with anything..

 

You will need a manual to do the heads for all the torque values timing belt ect ect. I wouldn't jump to conclusions to quickly, check radiator fluid level and see how much you are losing and if it is coming from the head, smell the exhaust, does it smell sweet, pull the plugs after it has sat and scope inside looking for radiator fluid on the piston. I knocked the lower rad hose off my old 4R out bush wacking, ran her dry and siezed it up, walked home and filled her up with water and drove away, once the cold weather hit I noticed steamy sweet smelling exhaust, and if i left it sit for a day or two it would hydro lock a piston and need to be hand cranked to roll it over so I could use the starter, I chalked it up to a cracked head and tossed another good known engine it instead of worrying about other damaged that may have occurred, and that was the quickest way to get back on the road since I had a spare motor in a parts runner truck..

 

A modest amount of white steam is normal - depending on conditions. if ti's cool and humid, and the engine and exhaust system isn't fully warmed up - there can be quite a bit (gas burns into CO2 and H20).

I'd do some more checking to make sure the HG is bad before diving into it. It's not a trivial task. As mentioned - you'll just want to go ahead and get a manual for that. If you're asking how to do it, you'll need waaaay too many details for anyone to want to type out.

But look for other symptoms first.
- bubbling in the radiator (and you can get a tester (some places like Autozone rent them for free) to test them to see if they are combustion gasses
- missing on a cylinder - pull out the plugs and look for one that is either clearly wet from coolant, or suspiciously cleaner than all the others
- losing coolant with no obvious leak in and around the engine
- exhaust has a slightly sweet smell to it

Unfortunately, the engine design is a bit hard on headgaskets. Not TERRIBLE like the earlier 3.0 V6's. But the steel block and aluminum heads just expand at different rates as the engine heats up and cools down. And this rubs against the HG bolted in between them. And eventually it wears them down. They went through multiple designs on the gaskets before arriving at one with great durability. So if you replace them - get the latest style - from a 2002. It's all steel - a MLS (Multi Layer Steel) design. Earlier versions were the regular composite style with varying amounts of steel cladding on one side.