Water Pump

[philip]

I see that NAPAonline.com has three pumps, one rebuilt, one new aluminum and third that looks like the "N" cast iron pump, No. NWP559198 , which is the most expensive, $66.99. If it is the cast iron, for that small difference in price I will get a new one.

You will never find an aluminum SD2x or SD33. You want a new "N" cast pump. What you refer to an aluminum is for the Z22 gasoline.

[asavage]

NAPA does call out a WP for SD as "cast aluminum". Could be a miscategorization.

NAPA TFW42325

[asavage]

The GMB water pump I installed and put a bit over 600 miles on in one day ... failed.

One of our service vans is 2000 Dodge 3/4T 318ci. 180k miles. WP was supposedly replaced at ~100k. Started making lots of noise last week. No shaft play. Pulled it off: GMB, impeller contacting housing. FLAPS sold me GMB before I realized that I was taking off a GMB. Took it back, ordered one from Dodge instead.

GMB = $70 (with gasket)
Mopar = $105 (with gasket & o-ring)

Both new.

To be fair, this eight-yr-old rig's radiator is about half plugged. I don't know how you can get that much corrosion and coating of the rad's tubes in only eight years, but somehow they managed to do it.

[philip]

SNIP- To be fair, this eight-yr-old rig's radiator is about half plugged. I don't know how you can get that much corrosion and coating of the rad's tubes in only eight years, but somehow they managed to do it.

Mixing coolant with tap water from a region having very mineral ("hard")water. Don't assume about municipal water.