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post #1 of 5 (permalink) Old 11-10-2012, 05:59 PM Thread Starter
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New waterpump new noise

Hi just wandering if anyone can help me out with a problem

I installed new waterpump on my 94 LT1 yesterday, It sounds like something is rubbing inside of the thing. It squeaked on start up, I thought it was just the belt as it was soaked. The squeak is now intermittent, but the pump constantly has a groany sound to it.

I don't know what I could have possibly screwed up here. The pump is made in china ( asc or acs) is on the box. I put the coupler on the waterpump first, pushed it onto the seal with some grease, made sure splines went together and bolted it on, it was a little snug on dowls.

Opened bleeder filled up until coolant seaped out fired it up cracked bleeder again. engine is running at correct temp etc.

Figured someone else may have run across this.

thank you
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post #2 of 5 (permalink) Old 11-10-2012, 11:02 PM
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Mine makes those kind of noises when its not bled well but I see you have done that so I'm not sure. I'd post this in the engine tech section to get more responses.

292 Comp cam, 1.6RR, MSD 6AL2/coil/wires/Opti, BMR torque arm/LCA's, UMI subframe connectors, Weld RT-S 15x10, 325/50 Nitto, cust. intake, Pacesetter LT's/Y pipe, cutout, Magnaflow catback, solid motor mounts, cust.fuel line, and lots and lots of weight reduction.Work in progress. 100% of work done by myself.

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post #3 of 5 (permalink) Old 11-11-2012, 07:12 AM
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Being that you bought a imported pump, there's a 50-50 chance of it being bad right out of the box. I'm sure the company you bought it from will give you another one, but it will have the same 50-50 chance of being bad right out of the box. For parts like water pump, opti, etc, I would go with genuine GM and pay the piper.
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post #4 of 5 (permalink) Old 11-20-2012, 11:38 AM
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hey there
how many miles on the engine? it is possible that the gear that drives the waterpump is going bad and is causing the noise also. They do not go bad, but i have seen where the drive gear has gone bad. Did you try turning it before putting on the waterpump gear coupler? I m afraid the only way to find out if its the pump or the drive gear is to take the waterpump off and inspect both parts carefully


andy schuck
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post #5 of 5 (permalink) Old 11-20-2012, 01:06 PM
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everyone runs into it with cheap or reman pumps on all sorts of engines,

sometimes it goes away and the bearing or whatever surface is rubbing just breaks itself in

.. and sometimes it sticks around and your waterpump takes a piss all over your motor in a short amount of time

thats why people pay more for a real pump.. but hell i've had a brand new gm pump squirt after 100km

just for fun, try firing it up with the serpentine belt off and see if the sound persists?
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