eating water pumps. - Diesel Forum

skibarefoot · 11-02-2009, 11:24 PM

Any ideas for why I'm about to change the second water pump for leaking in the exact same place? I bought a reman water pump from napa. After a few months a leak developes by the t-stat. I am going to borrow my buddies psi tester to see exactly where the leak is. I have the 203 t-stat and the billet t-stat housing. I can't see any cracks or defects on the last pump to cause the leak.

Thanks

**techkdb** · 11-03-2009, 03:45 AM

Square oring just doesn't seal very well. Try using RTV and your leak at the thermostat will stop.

skibarefoot · 11-03-2009, 08:27 PM

RTV on the o ring, with the o ring on the mating service or without the o ring just using RTV? Thought about trying RTV but wanted to aks first.

HighwayPrisoner · 11-03-2009, 08:52 PM

A little rtv on the thermostat housing with the o ring installed. Those water pumps cause indigestion, and are hard to chew.

skibarefoot · 11-03-2009, 10:42 PM

I'll try the rtv next chance I get. And yes, even though I do my own work and my buddies NAPA will warranty this pump too, it is hard to digest and chew changing it again!!

boomboom · 11-04-2009, 02:21 AM

where is your new pump leaking? You say by t-stat, where the sender screws in or the mating surface between pump and engine. Or is your pump leaking at the weep hole and your t-stat housing too ?