1HDT: Water Pump with Timing Belt Interval (3 Viewers)

[CaptBeardilocks]

About 4yrs ago I refreshed my 1HDT engine when I swapped it into my FZJ80. That included a real block flush & a new oil cooler etc etc. And obviously a new water pump & timing belt etc. As well as a turbo/IC upgrade pushing a moderate 20psi.

I'm at about 54k miles on the refresh and am planning on doing the timing belt this maintenance round a bit earlier than the recommended 62.5k miles. In part because I'm sure the belt takes a bit more abuse with the bigger turbo (plus I run the truck fairly hard) and because I'll be in a desert somewhere next year come the 62.5k mark. Early is better than later.

Any reason I should go the extra step and replace the water pump now?

I have a digital water temp gauge and she virtually never strays from 178-182F. So no worries there.

 

[veiloctane]

I do mine every 100k km

Pump and belt and all idler pulleys and seals everything while your in there.

 

[rick_d]

Matt-
How clean is your coolant? Did you ever physically inspect the oil cooler behind the injection pump?
If all that is good you can run the water pump for 200,000 miles. Icky, has 350,000 on his 1996 hdt in fj60 conversion.

 

[CaptBeardilocks]

Hey Rick!

New oil cooler behind the pump. Complete system flush (engine out of the vehicle). New radiator. All new pipes/hoses. (Well "new" being 4 years ago, haha.) Coolant is pristine.

Thanks. I felt like 60k miles was a bit short for an OEM Toyota Water pump. They're pretty robust. Makes the timing belt job about 75% shorter without adding that.

 

[TheBussman]

Your belt doesn't have any more stress unless you put stronger valve springs or higher lift camshaft. All that boost and drive pressure might even make it a little easier to to open the valves. I would inspect the waterpump while you have it apart and if it looks good I would leave it alone but that's me. Just replaced a made in 1997 pump off a t-100 with 357,000 miles, still not leaking, good tight, smooth bearings. different engine but still.

 

[CaptBeardilocks]

I know the Water pumps in the 5VZ Toyota's are good for just about their advertised life span of 90-100k miles. My 425k mile Taco would usually alternate btw the pump leaking at about 90k or making it to a 100k change.

But with a fully rebuild cooling system, I'll leave the water pump in the HDT for another go-round unless I see any evidence of leaking.

This maintenance cycle is already heavy enough. Ugh.