Poll: 2008 4.7 valve adjustment schedule

Pole: when have you done this? looks to be a real pain in the ass! Dealer tells me NEVER? am concerned to say the least-- mine has 175K ..dont know its history. thanks in advance

 

Just change the timing belt every 90 K. Have not seen one thread about adjusting the valves. Don’t even think you can. Overhead cam’s hydraulic lifters, leave it alone.

 

Not true! Bucket and shims...just like sport bikes.

 

Is it noisy? Last time I adjusted some valves was on a 1979 20R About 22 years ago LOL really smoothed out the engine noise.

 

Shims? On a 2008 vehicle? I would definitely take the dealer's advice: NEVER!

I could be wrong, but I think the only time Toyota really expected shims to be used was if necessary to get the valve train in acceptable range during original or rebuild assembly. The hydraulic lifters provide the fine adjustment automatically. We had a 1998 Avalon with a V6 that had the shim adjustment procedure in the SRM. BFD. Adjusting the old mechanical tappets was a vacation compared to shims. I can't imagine one of those engines ever getting enough miles to need the shims changed.

 

I vaguely recall running across a thread (maybe on TS) where a guy did it. In the end I don't think he had to change any at 200k because they were still in spec.

EDIT: Found it

 

No hydraulic valves on a 4.7..not noisy at 175k. Just concerned...again dealer says don't worry about it.

 

I wouldn’t sweat it man. You’ve heard of the million mile tundra? That was the 4.7 L. Only timing belt and typical maintenance performed.

 

I believe @empty_lord checked his recently and all were in spec.

 

Yeah, you're right. I thought I knew something about this. Forget it, I was confused.

If your dealer says you don't need it, I wouldn't sweat it. I mean...What service manager could pass up having technicians doing valve adjustment with micrometers at $$$ dollars an hour.