HansImmer

Hello,

today we changed 4 parts on 2004 LS430:
A used alternator
V-Belt
PULLEY SUB-ASSY, IDLER, NO.2 (16604-50030)
PULLEY SUB-ASSY, IDLER, NO.1 (16603-0W030) was changed today to this idler:
https://shop.febest.eu/pulley-tensioner-0187-2uzfe.html

Now there is a noise. It comes from the left side (idler No.2, alternator). Guess it´s because of the idler No. 2. It was a cheap part. Maybe the ball-bearing is not okay.

Questions:

Is it okay that the srew which fits the idler No. 2 gets very hot after 2-3 minutes of running the engine (idle)? We used very small torque to fix this screw.

Does the Tensioner Assy have to be set for the new V-Belt?

Thanks a lot for your opinion.

bbtri

Sounds like you may have gotten a defective part. Rare. The mounting bolt should not heat up any faster than the others. Did you check that it's not rubbing on anything?

bradland

As with most things, you get what you pay for...
Sounds like it's either torqued too tight, which I doubt as IIRC there's a spacer collar to prevent that or the bearing is already shot. The heat is ultimately coming from the bearing.

YODAONE

Aftermarket parts are dicey.

Having a problem with a dealer purchased serpentine belt tensioner pulley for a 1993 LS400.

It is a superceding part number.

The fitment of bearing on the tensioner assembly mounting boss is sloppy, so slight wobble.

Not a fan of the thin bolt scheme (not a shoulder bolt that matches bearing I.D.)Toyota employed.

The original bearing sugly fit the boss but not the superceding P.N.

The take away here is when purchasing from dealer, ask if what they are quoting is a superceding number.

If so, ask them to check availability on original part number.

If no results, check internationally.

Right now am dealing with a 1999 LS400 OEM timing belt tensioner pulley that is wobbly after 10,000 miles.

Checked new dealer part at Lexus which is same superceding P.N., and it is wobbly.

The thing is...the superceding timing belt tensioner bearing P.N. is not offered in Japan (Amayama) suggesting that this is Toyota North America gamesmanship.