Valve lash inspection / adjustment on 4.0 V6?

No shims. Just various sizes of lifters ( buckets ).

http://www.customtacos.com/tech.old...6toyrm/06toypdf/06rmsrc/rm2006ta/00700310.pdf

 

Says something about the quality of these engines. They've got the valve lash pretty well dialed and they're just not setup to ever need adjusting

 

It makes me laugh when I read posts like this because of a proposed noise..
Someone earlier in the thread did mention injector noise.
Cold weather = more noise pure and simple regarless of engine type.

Simple solution 1 )...use a high viscosity oil...perhaps a 10W30..
Use a full synthetic like Mobile1, or Penzoil....these oils have very good cleaning properties as well.
Use an OEM Toyota oil filter...cannot go wrong with these...

And then re-evaluate the noise situation.

Also, as others have mentionned,....rev the engine to 3 or 4000 rpm ocassionaly,...valves accumulate carbon etc...leading to noises...

 

I've driven the crap out of a lot of Toyota vehicles in my life. I bought the first a 1966 Corona and since then there have been many and Never had to adjust valves.

Not mine, but the 1966 Corona looks like this:

 

I've had a few 90s 4wd trucks, an 87 supra and an 88 cressida that was pretty cool. I drove the cressida for a few yrs and it was fine until I loaned it to my buddy for a couple weeks. He gave it back running on 5 cylinders with a pretty heavy valve train noise.
Never got the time to dig into it but looking back it was probably a dropped valve guide or seat

 

What an ugly car...Oh my God!
And it was probably made from recycled beer cans to boot!

Wait, Wait...did you say you never adjusted the valves on a 1966 car????
I was(we were) sidetracked by the look versus the quality....WAY...WAY before Toyota had the present product quality reputation...
Or was that part of the long term marketing strategy?
Make it simple, make it good,..price it right,...market the product as such...(rabbit and turtle race!)...

My opinion is that Toyota make decent cars...call them good at best..
The rest just make flashy junk that sells to the average housewife that likes it,...cause it comes in pink or turquoise...
AND the rest of the car MFG's,...count on the marketing bullshit..to sell to the masses.
Toyota saw clear,...

Some of us cannot be fooled...all the time..

Kudo's to Toyota to see the long term vision on this...

The rest,...well keep buying Chryslers..etc..

 

That car was a beast. I beat that car harder than any vehicle I have ever owned and it never quit on me. It was ugly but dedicated!

 

What about someone, such as myself, that has 250,000 miles? I am looking to do some maintenance needed at high mileage and thought the valve train would be good to check/ adjust.

 

Toyota suggest valve clearance inspection/adjustment every 60k mi.

Tacoma Maintenance Schedule

 

If it is working and not causing an issue I would leave it alone.

 

If you want the correct method on how to check and adjust valve clearances, get yourself a 2 day subscription to TIS($20). Print out the procedure and have at it.

 

Just stating my experience with Toyota's.

I have never seen a valve head get pulled off of a valve on a engine. What happens with wear is that the valve lash gets tighter. I have a feeling that the spring that closes the valve is not going to pull the valve head off the stem. That is a ridiculous notion.

 

Thats great, The way it works though is, the "Lash" gets tighter right? so that means that the valve eventually ends up losing "Lash space" aka Clearance, if this happens, the valve gets held open or to the point that it doesn't seal completely... Now what happens to a valve that doesn't seal? It burns up, the valve needs to touch the valve seat in order to dissipate heat. now when a valve burns up, it stretchs (heavy end is in the cylinder and gravity is pullin on it) crazy right? now said person gets an issue, trucks having trouble starting.. well sir some ur valves are out of spec.. ok adjust them.. valves get adjusted and now they are back in contact with valve seat... Crazy right? now the the valve is fatigued and stretched guess what happens?

I build performance engines... I work in Aerospace/Industrial automotive quality.. I beat the living shit out of motors.. in ARIZONA HEAT.. you're experience doesn't pay for a dudes motor who takes your kiddy table advice.. theres a seat at the adult table and hopefully anyone who questions valve adjustments doesn't follow your advice..

 

My point is you will know you have an issue long before the head gets pulled off of a valve stem. That is just too funny. Keep wasting your time checking your valve clearance every 60K however.

Maybe your issue is you beat the living shit out of motors....

How many valve heads have you seen get pulled off the valve stem on a daily driver?

I'm done. You are entitled to your opinion.

 

Typically the valve face gets deformed.. and it's not an opinion its facts. Sorry you dont know what you are talking about

 

OK, so I decided to actually check the valve clearance on my 2011 V6 Taco. My truck has almost 80k miles on it and runs fine. Plenum and valve cover removal were straight forward. There were no surprises and everything went back together as planned. I would have removed the cams and replaced buckets if necessary, but lucky for me that was not necessary. The picture below shows the specific measured gap for each valve but here is the overview.

All Intake valves were between .006"-.008"
All Exhaust valves were between .013"-.014"

 

Spec is:

Exhaust: .011"-.015"
Intake: .006"-.010"

Conclusion: With 80k miles my motor is well in spec on valve clearance. In my experience intake valves may open slightly over time and exhaust valve will close as the valve seat is pushed up into the head. Considering that and the fact that all cam lobe and bucket surfaces looked free of wear, I would expect clearances to stay within spec for quite some time. Possibly the life of the motor.

However it was not hard for me to check them. I would NOT pay someone to do this job as you can never truly trust they would take the time to do it right. If anything hopefully this information provides some comfort to people who have not checked their valves and have no plans to.

 

I have no plans to mess with mine. A little tick from the lifters doesn't bother me a bit. What would bother me is a quiet valve train.

 

It’s not a race bike. Leave it alone. Drive the panties off of it. The frame will rot way before you have valve problems. But it’s your truck do with it what you will. Some people are complete hypochondriacs when it comes to vehicles. I got a 98 corolla with 208k on it and the valves have never been touched, my 99 taco had 600k miles on it and the valves were never touched. I don’t expect to see valve issues with mine until maybe 2.5 million miles.