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Water pump pulley sheared off again ecs supercharger

 
Old 05-24-2016, 08:52 PM
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goombadi99
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Default Water pump pulley sheared off again ecs supercharger

This is the second time in two weeks my water pump pulley sheared clean off the shaft. I replaced the pump last week with a Delco pump and today it sheared off again. All my pulley look good. Zero balancer wobble. Never had a problem until this year. Running ecs 1500 kit on a 6 speed transmission. I ordered a performance pump with a billet bolt on pulley and I hope this fixes the problem . Has anyone ran into this at all ? And this is the 6rib set up. I tightened the belt as per ecs instructions as well where the stock tensioner was at 80%max. I'm stumped.

Last edited by goombadi99; 05-25-2016 at 12:36 AM.
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Old 05-24-2016, 10:02 PM
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a/c man
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Yes I have seen this problem,some tack weld the pulley, seems to be the older pumps, I think 2004 or c6 is the pump to buy.
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Old 05-24-2016, 10:33 PM
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Is it coming off the shaft or literally breaking the pulley itself?
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Old 05-24-2016, 10:46 PM
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I walked the pulley off twice, but blue loctite fixed it and then I went flip drive
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Old 05-24-2016, 10:48 PM
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I can't remember if they are secured by a bolt or not but I added one to keep the pulley on
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Old 05-24-2016, 11:01 PM
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If it's coming off the shaft then have it welded on

If it's breaking the pulley then that's a whole different issue. "Sheared off" makes me think it's breaking something.

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Old 05-25-2016, 12:29 AM
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The pulley on the waterpump itself is breaking just above the shaft that it is pressed onto.
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Old 05-25-2016, 12:31 AM
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Today's <br ><br >
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Old 05-25-2016, 12:33 AM
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Here is the waterpump that blew apart last week. This pump had been on since last year being supercharged. <br >
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Old 05-25-2016, 12:35 AM
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And this is the new pump I ordered tonight. Bolt on billet pulley and pump. <br >
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Old 05-25-2016, 01:09 AM
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dang, I see this every now and then but more than once on the same car in that short period of time is odd... how tight is your belt?
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Old 05-25-2016, 06:43 AM
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Originally Posted by neutron82 View Post
dang, I see this every now and then but more than once on the same car in that short period of time is odd... how tight is your belt?
Tightened it to ecs specs. 80% percent max
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Old 05-25-2016, 08:11 AM
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I wasn't paying attention to which pulley. PS is what I walked off.

Hope your new pump works
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Old 05-25-2016, 09:24 AM
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DOUG @ ECS
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That is a rare to happen so fast to the same car, the pump you posted looks good though. One thing to check upon installation is that the mounting boss for the original tensioner, now our main bracket is the same height. I have seen them be off before.

When you have the old pump off, place it on a flat table along side the new pump for a quick verification of the two. That can save you a world of belt troubles down the line of they are off.
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Old 05-25-2016, 11:42 AM
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Awesome thanks Doug. I spoke to Chris this morning to and he agreed the new pump should fix the problems
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Old 05-25-2016, 07:04 PM
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Will an LS2 pump fit ? much smaller bell so should be a lot stronger as far less leverage acting on it
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Old 05-26-2016, 10:30 AM
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Originally Posted by stevieturbo View Post
Will an LS2 pump fit ? much smaller bell so should be a lot stronger as far less leverage acting on it


The LS2 pump has the bolt boss .070 farther back then the C5 does, so be aware of that. It will throw off the belt alignment.
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