2009 4.0 Gen II Valve adjustment instruction.

Im looking for any tech info on 4.O 2009 engine valve adjustment inspection instructions.

 

ummmm.... from my understanding is that there is no real valve adjustment procedure. it has hydraulic lifters, something like that. unless ur looking to adjust the shim bucket to cam -gap.

 

Go here: http://www.tacomaworld.com/forum/2nd-gen-tacomas/197017-valve-clearance-maintenance-check.html

 

wow. just read it. i figured its something like that but damn. unless u really wanna have kids with ur truck or ur just shitting out money then i would rec to do it (at a dealership). thats a really big job.

 

That's what I'm thinking, but the maintenance schedule is requiring this action. Hmm. Just don't want to burn the valves............

 

I seem to remember the way they worded my maintenance schedule is that the "inspection" consists of listening for sounds that would indicate incorrect clearance. I don't have it in front of me right now but I remember thinking that was kind of a joke. I asked my mechanic about valve clearances on this engine and he told me that it should be checked (actually measured), but not needed until over 100K and probably not an issue until 150K. He's a 30 year Toyota guy.

Also, if you wanted to check it, that shouldn't be a really big deal to pull the valve covers and take measurements. It's only a big deal if it actually needs to be adjusted.

 

THX

 

This question has been asked many times. And the answer is, unless your engine is running like trash, there is no need for an adjustment let alone even to check the clearances. If your engine is running like trash, then you should check other things first, like spark plugs, air filter, maf sensor, map sensor, and a few others.

 

personally, ive never heard of valve adjustment check (physically) recommended by my dealership. i've only heard of -check for excessive valvetrain noise (which is normal to some degree).

to actually tear down and measure clearances is big bucks man. i think that unless ur hearing excessive valve noise and the vehicle has over 100k then it might be a good idea to check clearances. other than that i think ur making me money. (IMO)

 

THX to all for the info.

 

I agree. I'm a 100% DIY person(Heavy Equipment Mechanic). Truck runs great. Just keeping my PM up to par.

THX

 

Listening for valve noise doesn't make much sense. Noisey valves are loose. Loose valves only affect performance. The loose gap means that the valves do not fully open so the flow of gases is restricted.

A tight valve on the other hand makes no noise, and it is the one that does engine damage. A slightly tight valve spends less time on the seat, so it has less time to transfer heat. A severely tight valve may not ever actually close, but that case would cause some pretty rough running.

The only way I can see this type of valve set-up ever tightening though is through valve seat errosion, and that would be a very high mileage thing.

 

As long as it sounds like a sewing machine leave it alone.Keep using good oil and keep it changed to minimize wear and you should never have a problem with valve adjustment.