Northstar 4.6 water pump how to - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-22-2007, 10:28 PM   #1
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Default Northstar 4.6 water pump how to

i will be posting a writeup shortly on how to change the water pump you wont believe how easy it is
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Old 06-23-2007, 03:50 AM   #2
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Please share.
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Old 06-27-2007, 10:06 AM   #3
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??? I guess it wasnt so easy? I had my doubts.
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Old 06-27-2007, 12:29 PM   #4
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NO really it'* not really that hard.. But not something I want to explain.

There is a cover on the Drivers side of the block remove the 3 10mm bolts and the pump (Internal) is right there.

I'm waiting for the how too aswell
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Old 06-27-2007, 02:42 PM   #5
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sorry guys couldnt get my camera to upload on my new computer so here it goes
1. Drain the coolant

2. disconnect upper and lower rad hoses from driver side of the motor i also disconnected the upper engine mount - note: upper one isnt neccesary to remove but i did anyway to make the removal quick as possible

3. there are 4 10 mm bolts that hold on the thermostat/water pump cover remove them and be careful not to drop them.
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4.now for the fun part use a breaker bar (1/2) with the northstar water pump tool insert it into the cavity until it locks firmly in place NOTE: THIS IS THE MOST DELICATE PROCESS THE ALUMINUM HOUSING CAN BE EASILY CRACKED CAUSING IT TO LEAK USE CAUTION AND FINESSE! )
now push the bar clockwise-(towards car) it will click foward

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5. use a ratchet where the cam tensioner arm is to release the water pump/cam belt off the pulley(rotate clockwise as well to loosen belt tension)
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6. gently pry the old water pump out and replace rubber o-ring

7. Line up new water pump into the slots attach tool gently but firmly rock the pump towards you till it locks back into place
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8.reassemble everything , now is also a good time to replace thermostat, tighten all connections start it up and check for leaks
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Old 06-27-2007, 10:08 PM   #6
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BuickMan, What model car, and N* is this? The setup looks nothing like the LD8 in our GXP..
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Old 06-27-2007, 11:36 PM   #7
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sorry this was a 98 model northstar im not familiar to the diffrent variations, but i couldnt imagine them drasticly diffrent if it is then i will just delete the post , just tryin to help out
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Old 06-27-2007, 11:58 PM   #8
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Moved to the Lounge. This is totally unrelated to any Bonneville drivetrain.
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Old 06-28-2007, 04:44 PM   #9
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Green coolant? Shouldn't you be running Dex?

Yea, you need a special tool to take the water pump out, you can rent it at Autozone or buy at Napa. Theres no other way to get that sucker out.
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Old 06-28-2007, 05:55 PM   #10
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That'* an OLD Northstar. And no, NOBODY should be running DEX.

Bosch Plugs are Satan. Dex is the Devil.
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