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Change water pump?

Old 02-10-2019, 08:08 PM
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Change water pump?

Hello. Just purchased 08 cobalt lnf with exactly 100k miles. Previous owner was the only one owner and did great maintenance on it did everything required and then some. Was wondering if I should change water pump if it hasnít been changed? But current one seems fine. Love to hear some advice on this please....................oh yeah Iím new proud owner of her and Iím excited!!!
Thanks for having me!

Last edited by Roguefit203; 02-10-2019 at 08:17 PM.
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Old 02-11-2019, 08:59 AM
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I wouldn't change the water pump unless you need to get in there to replace timing chain or something as long as there is no indication it isn't working properly. I changed the water pump recently with the front cradle dropped and it wasn't too bad but you have to take the T-stat housing loose to get the water pump out as well. Not sure how much different the cross-pipe is on the LNF but your turbo and exhaust may get in the way also. If you ever do change the water pump I would recommend also going back in with the Cloyes balance shaft/water pump chain kit. It comes with new chain, guides, tensioner, and sprockets.
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Old 02-11-2019, 09:32 PM
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I agree, I wouldn't mess with the water pump until you need to. You however don't have to replace everything just to do the water pump. There's an access hole in the timing cover you remove and there's a special tool you bolt down to the timing cover and it bolts to the sprocket so then you can unbolt the water pump itself from the sprocket and pull it out the back. Yes you do have to undo the 2 or 3 ten mm bolts from the thermostat pipe but it's not terrible. You can actually undo the thermostat hose and just let the pipe itself dangle to slip the water pump out. I have to replace mine cause it drips out the back of the housing when it's below 20 degrees on cold start up. But I don't drive it much anymore so it's just sitting in my closet lol
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Old 02-12-2019, 09:12 AM
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Originally Posted by C0balts5 View Post
I agree, I wouldn't mess with the water pump until you need to. You however don't have to replace everything just to do the water pump. There's an access hole in the timing cover you remove and there's a special tool you bolt down to the timing cover and it bolts to the sprocket so then you can unbolt the water pump itself from the sprocket and pull it out the back. Yes you do have to undo the 2 or 3 ten mm bolts from the thermostat pipe but it's not terrible. You can actually undo the thermostat hose and just let the pipe itself dangle to slip the water pump out. I have to replace mine cause it drips out the back of the housing when it's below 20 degrees on cold start up. But I don't drive it much anymore so it's just sitting in my closet lol
The special tool keeps the old sprocket in position so that the balance shafts don't accidentally get out of time from loose chain?
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Old 02-12-2019, 06:57 PM
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Yes. The tool bolts to the timing cover, and then it bolts to the water pump sprocket so that everything stays perfectly in time. No need to mess with the timing. Then you remove the thermostat pipe from the back side, let it dangle or completely remove it. Then on the water pump there is two bolts on that go through the front, and then 2 on the back. Not terrible to do
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