Duramax Diesels Forum Truck of the Week
  #1  
Old 11-18-2017, 11:01 AM
Veikra Veikra is offline
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Default waterpump died at 30 000 miles

Hi,

When I did my heaadgaskets 3 years ago I also put in a new waterpump, welded unit from a appreciated seller.

But now, after only 30 000miles it'S already leaking from the weap hole.
Im pissed, especially since I did coolant replacements every year.

Is there any ways to prevent this again? First pump lasted 250 000miles
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Old 11-18-2017, 12:43 PM
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Oem pump?
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Old 11-18-2017, 01:33 PM
Veikra Veikra is offline
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was advertised as OEM with welded impeller, priced accordingly.
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Old 11-18-2017, 01:45 PM
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You could start by not changing your coolant every year. That's just a waste of time and money. Long life coolant is good for at least 3 - 5 years. If you're really worried about it's condition use test strips to check it or maybe toss a little DCA in it once a year.

Second unless you're spinning really high rpm's I wouldn't bother with a welded pump. A stock AC Delco will work just fine for you.
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Old 11-18-2017, 02:10 PM
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I flush because I have to take the radiator off every year to clean the debris between the stack.

Good comment on the welded pump. I put this "upgrade" because why not. But my truck never sees 2500 rpm with our low speed limits. They probably precooked the seals by welding it....
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Old 11-18-2017, 04:23 PM
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Isn't wagler supposed to be making a billet pump?
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Old 11-18-2017, 06:10 PM
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Quote:
Originally Posted by LBZ View Post
You could start by not changing your coolant every year. That's just a waste of time and money. Long life coolant is good for at least 3 - 5 years. If you're really worried about it's condition use test strips to check it or maybe toss a little DCA in it once a year.

Second unless you're spinning really high rpm's I wouldn't bother with a welded pump. A stock AC Delco will work just fine for you.
X2. We install oem acdelco pumps. Use to weld them until last year. Gm must have changed manufacturers cause the newer ones don't weld worth a crap. Never had 1 failure.
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Old 11-18-2017, 09:15 PM
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Quote:
Originally Posted by Veikra View Post
I flush because I have to take the radiator off every year to clean the debris between the stack.

Good comment on the welded pump. I put this "upgrade" because why not. But my truck never sees 2500 rpm with our low speed limits. They probably precooked the seals by welding it....

What seals,?
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Old 11-19-2017, 06:25 AM
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Quote:
Originally Posted by hondarider552 View Post
What seals,?
I think they mean between the gear and the impeller. I read a recent thread about welding pumps where a couple guys said they put wet towels around the gear when they're welding it so the heat didnt transfer down the shaft and wreck the seal.

I personally would rather pin the gear than weld it. But thats me.
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Old 11-19-2017, 09:30 AM
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My original water pump started leaking at about 245,000 mi. Decided to install a welded water pump and new GM thermostats and Mishimoto coolant hoses. BIG MISTAKE! After about 5000 miles truck started to overheat. spent a small fortune trying to trouble shoot changing thermostats and what not noticed that only the engine would get hot and not the radiator decided to remove the welded pump and found the impeller spinning on the shaft! Needless to say I installed a GM water pump and have been trouble free since.
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Old 12-27-2017, 02:45 PM
alohazabel alohazabel is offline
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Veikra- That sucks. I Just finished doing the head gaskets on my LLY. Watched your youtube videos for help along the way. There was nothing wrong with my old water pump (115000 miles), but I replaced it with a welded pump anyways because it seemed like everyone else was. Wish I had seen this a few weeks ago. I might have just left the old one alone. What pump are you putting in now?
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Old 03-09-2018, 10:27 PM
Veikra Veikra is offline
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Yes, huge mistake, I bought a ac delco and will be putting in the truck soon. My videos on the duramax were crap, cold garage and get 'er was more important. People don't realise the amount of extra time it takes to video stuff.

So yeah, factory AC DELCO one this time ! Comes from dealer through his pricing so I don'T get robbed either
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Old 04-16-2018, 09:55 PM
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Ended up being the oring in the thermostat housing. It was dripping from the back, hidden behind the pulley and filling the weep hole of the pump !
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2005 Sierra 3500 SLT, Duramax, Crew Cab, Long bed, dually. Black with Tan Interior
ARP Studs, Grade Cs, EGR delete, Welded WP, LBZ Mouthpiece, LML hydroboost
1991 Isuzu Impulse AWD Turbo
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Old 04-17-2018, 04:02 AM
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glad you got it figured out and thanks for posting the solution. Did you end up changing pumps out or figure it out before you made it that far?
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Old 04-26-2018, 08:56 PM
Veikra Veikra is offline
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I was at the bolts of the water pump, fan idler out, crank pulley off. When I felt for the bolts I felt wetness higher up and it led me to the rusty looking tube which I pulled off to weld , and saw the oring was ugly and hardened throughout the years. It was leaking at the backside or the engine side and not the visible side when looking at it.

So I have a spare genuine ac delco water pump if anyone is interested locally. Or ill put it in at 700 000 miles or 1 000 000km
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ARP Studs, Grade Cs, EGR delete, Welded WP, LBZ Mouthpiece, LML hydroboost
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