I searched in lots of sources and couldn't find the torque specs for my RX330 front suspension subframe bolts (in FSMs they call it member-to-body mounting bolts).
Nothing there in RX330/RX350 service manuals.
Who knows what these values are?
Highly appreciate your help with this.

 

Welcome to Club Lexus, monch.

If you are referring to what is listed in the repair manuals as the "Front suspension member brace rear x Front frame assembly" then they should either be 63 ft.*lbf or 24 ft.*lbf depending on which bolt you are referencing. The class for each bolt should be noted on the head. With class and diameter information it is easier to reference.

 

Thanks RX330inFL!
I'm referring to bolts A in the attached picture, this is RX300 subframe.
And for RX300, the spec tells 181N*m = 133ft*lb.
I'm not sure if this applies to RX330 or not, very confusing.

 

Believe this to be an equivalent diagram to yours for an RX300 from the Sewell web site:

http://lexus.sewellparts.com/oem-cat...X300-2003.html

Here should be the same for the RX330:

http://lexus.sewellparts.com/oem-cat...X330-2006.html

Once you find your bearings you should find the rest you need in your service manuals.

 

Thanks a lot for the links and hints!
Found the bolts with torque values, 63 ft.*lbf, exactly as you told before

 

Those bolts are probably marked as a class "10" or "11" on the head and are 10mm if I remember correct. Depends on if they are a hexagon head or a hexagon flange bolt. Guessing based on past experience with bolts around that size and rating having 63 or 64 ft.*lbf torque ratings. Fairly common.

Let us know what problem you were working on.

 

Your links helped me to find the right page in foundry service manual. Attaching the snapshot.

The problem I'm facing is a pop sound (sounds like a metal-to-metal hit) coming up from front suspension(?) when I drive the car slowly on bumps diagonally, means only one wheel on the bump.
I can feel that pop even on steering wheel.
Still can't find the reason, maybe I should open another topic to have experts advices ...
The subframe bolts were lose, tightened them but sound is still there.

As the car is under gold extended warranty, took to the dealership, they insist both front struts need to be replaced with all the rubber components and the bearings, $1800 total, warranty covers only $800!
No way, I told them to replace only whatever warranty covers, the other stuff I'll take care of.
So waiting for them to get my car back today and will start the "scientific research" by myself

 

I've experienced exactly the same symptoms for months and just found this post. So far I have replaced wheel bearings, struts, strut mounts and bearings, control arms, ball joints, and tires. Wheels are balanced and brakes are good. I did find play in the axle shaft, and am waiting for the part to arrive to replace.

I searched for this subject because I saw slight movement at the subframe mount (or member body mount) when the steering wheel was being turned left to right while looking under the vehicle on the left (driver's) side.

I'll check the bolts, but was curious if you were able to resolve the metal-to-metal hitting or play you felt / heard...

I've been wondering if those cushions are worn...if maybe that is a contributor.

 

Unfortunately that sound is still there. Dealer replaced both the upper strut mounts, checked all the rubber components were fine. The frame bolts were re-torqued, nothing helped. After the strut mounts replacement, the sound was almost gone, but it returned after a month. I tend to think the strut bearings are the reason, going to order and replace them, will report the result.