Engine/Transmission (1998.5 - 2002) 110,000 miles on 2002, 3500. Doing coolant change. Time for water pump?

[Motorhead]

I had a second gen before my present third gen truck. I service a neighbors 2002, 3500, 2wd automatic and I am going to do a cooling system antifreeze change and replacing the thermostat (Genuine Cummins thermostat). The truck has 110,000 miles and has the original water pump. NO leaks. The lady that owns the truck uses it to pull a 10,000 lb horse trailer with living quarters most of the time. At 73, she still travels through the state to go on rides with friends. I know from 45 plus years that water pumps can go 200,000 miles or go 10,000 miles. Any opinions as to whether I should replace it while I am in there flushing the system?

 

[GrantP]

My 97 was at almost 200k on the original water pump when I sold it. That said, it's cheap enough just to do it while you're there and have the peace of mind. Check the idler pulley too...that has burned me more often than a water pump.

 

[KATOOM]

Sometimes messing with working parts causes more problems. Mostly because replacement parts are inferior these days. But I'd leave the water pump alone. They're not hard to change and a leaking pump wouldn't stop someone from getting home if they had water on hand. AsGrantP mentioned, the idler puller is far more problematic than WP's.

 

[Motorhead]

I'll check the idler pulley. katoom, your philosophy on how replacement parts now aren't as good of quality as the original parts follows my feelings exactly. I'll probably leave it alone.

 

[SAndreasen]

If you decide to do it I would get a Cummins water pump . I used a cheap one and it's fine but for an old lady I'd buy the best

 

[KATOOM]

Agreed..... Stick with Cummins OEM parts. Especially on her truck.

 

[GrantP]

I guess you'll know more once the belt is removed, if the bearings spin nice and smooth then leave it alone. If they're a little rough...I definitely agree going OEM Cummins.