Way too early unless you have some kind of issue

 

I thought this was a 100k or 120k service schedule.

 

Vehicles with serpentine timing belts (recommended to be replaced around 60k-100k miles) it is often recommended to have the water pump replaced at the same time because replacing the timing belt requires the mechanic to be working right there where the water pump is located, so due to mileage and cost to [only] replace the water pump at possibly some later time you might as well go ahead and replace it at the same time. The Lexus GS 350 has a timing chain that does not require changing like a serpentine timing belt does. Therefore, there is no need to replace the water pump until it shows signs (bearing noise, leakage) that it really needs to be replaced. There should be no more of a reason to replace the water pump before it is necessary than to replace light bulbs or speakers...

 

good info and I know the timiing chain is "suppose" to be looked at or adjusted after 100k miles

 

You may want to look into that again...

 

I don't disagree with your recommendations, but what you wrote may be confusing to some. There is a serpentine belt(accessory belt) and there is a timing belt(drive belt). There is no such thing as a serpentine timing belt.

The reason people do water pump at the same time as timing belt service is because you have to remove a ton of stuff to get to the timing belt - and water pump life is typically about the same as the timing belt and relatively cheap in parts cost. As you stated, the GS has a timing chain, so you can wait until signs of leak, and when it does, do yourself a favor and get the thermostat and tensioner done at the same time while you have the coolant out.

 

This is indeed a problem for certain timing chain cars - look up "GM 3.6 timing chain". The problem is due to stretch in the chain over time eventually causing timing to be off.

Luckily the 2GRFSE in pre-refresh 4GS has over 10yrs of history now and I haven't seen this to be an issue amongst the 3GS and 2IS owners.

 

water pump can be done at 120k

 

You could argue the water pump need not be replaced until you see symptoms: higher engine temps, more frequent secondary fan running, leaks.

If you change your coolant on schedule and only log hiway miles, your water pump will likely go well beyond 120k.

 

I changed out my serpentine belt last night because it was very dry and starting to make noise. While I was in there I checked the water pump for any leaking and play in the pulley. Everything was in good shape and I am at 100,000 miles. This is not something I would personally try and do early or lump in with a 100k/120k service.

 

The Toyota Super long life coolant is spec-ed for 120k change isn't it?

 

Maybe. But the GS Maintenance Schedule has a coolant flush at 60k.

Edit: Oh no it doesn't. It says 100k.

 

My 2013 GS 350 maintenance schedule doesn't state that...

 

That's right. It's an INSPECTION only item at all 30k intervals. It is suggested for replacement at 100k per the service manual.

FACTORY RECOMMENDED Service for 100K Miles /120Months

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