Mr.Panda

I have a 2005 RX 330 with 18,995 miles (bought brand new and not a typo). Maintenance wise, the car has only received oil changes. The next oil change will be done at 20,000 miles. Was wondering what your guys' thoughts are as far as replacing the timing belt, idlers, water pump, etc. I know I'm way under the mileage for replacing these items, however, going by the age of the vehicle I'm wondering if it's time to replace these items? Your input is appreciated.

TechnoGeek

I've heard the interval on the TB is 90K OR six years, so the latter part means you are due.

My understanding is the 3.3 is an interference engine, but has valve depressions in the pistons that decrease the chance of valve-to-piston interference in case of timing belt failure (on motors without VVT-i).

An interference engine means the pistons hit the valves and do major damage when the TB breaks, while non-interference just stalls the engine.

Extreme heat or cold are the hardest on rubber parts like timing belts and hoses, so if the car sits in LA traffic a lot, then those parts need to be swapped.

While the coolant is out, great time to swap radiator hoses and other coolant hoses, and the thermostat.

EDness

i say do it. Do at least the timing belt.

KLF

I would probably change the engine belts (2) and the timing belt, but I see no reason to replace the idlers or tensioner, water pump, or any of the seals. Even the coolant and thermostat should be fine, although I would never put used coolant back into an engine except in an emergency.

mandyfig

I personally think you are good, if I were you will wait for for 10 years before you do the belts.

mandyfig

Nothing replaces the inspection of the drive belts. At least have them checked and if cracked, replaced. Willing to bet they are still near pristine.

HtownBlue

The Toyota belt is one of the best made. Their source factory makes some of the best belts in the business. I would bet good money that your belt is fine.

Dry rot is your concern (if any). Over time the rubber will deteriorate, but because that belt is covered and not exposed to the elements as a standard belt, the life is extended. These belts are VERY well made. I would bet you will get at least 50K out of it before it even looks half worn.

People need to remember that the maintenance schedule is made with dollar signs in the minds of the manufacturers and dealers. Of course regular maintenance is good, but often the dealers recommend things WAY too early. Just my opinion.

Mr.Panda

Thanks for the replies folks. I will check the accessory belts tomorrow. I'm expecting that they will be in good condition as the vehicle has always been garaged. I still have another 1,000 miles to decide on whether I am going to go ahead with the TB change or not.

JoeInHNL

I still have the original timing belt in my 2004 RX330 (72,000 miles, build date March 2003). I will let you know if/when mine fails so you know when to replace yours.


From the Lexus website http://www.lexus.com/contact/maintenance.html

What is the factory recommendation to have the timing belt replaced?
Our timing belts have been very reliable. However, the timing belt is subjected to severe stress if the vehicle is operated under extensive idling or low speed driving for long distances, such as in heavy commercial use like delivery, taxi or patrol car. If the timing belt breaks, the engine will stop running and will not restart until it is repaired. While it is possible that the original timing belt may last the life of the above engines, for peace-of-mind, the timing belt may be replaced every 90,000 miles. Also, if major engine work is performed, such as a valve job or engine rebuild, the timing belt should be replaced.

Mr.Panda

Thanks Joe. It would be of great benefit if you'd keep me/us posted on your TB status.