What exactly fails on the LNF waterpump? It looks like a major PITA to replace after watching the engine build videos.
Is it higher RPM? Higher than normal temps it is designed for?
It's very expensive and a huge pain to replace!!! It's about $1500 at a dealership to have this done. Some here will tell you they've had it done for less then $800, but that's because they went to a dealer that had ZERO clue what was all involved and didn't know how to quote a job correctly.
There's a lot of "theory" on this, but we've never really figured it out. There are several MAJOR considerations for this:
1. The WP that were included on our cars were about 8 pieces pressed together. These "pressurepoints" over time leak. New designs are less then 4 pieces.
2. Since the turbo cars usually...usually fail sooner then NA cars, it could be attributed to heat. The turbo is above the WP, the cat to the back...temps in there can get very high, thus causing premature seal failure. There is very little air that circulates in that area. If you look at Cobalt SS forums, they don't have the failure rate that we do...which is odd, but the motor is transversely mounted.
3. The coolant over time "balls up". Little microscopic balls form in the coolant and lodge themselves between the seals, causing the leak.
4. One thought that used to be far-er fetched is the vibration from the balancer chain and balancers in the motor. If that was the case, there would be more failures in the Cobalt SS, HHR SS, ATS, Camaros.... However, many people aren't in tune with their vehicles like others. And a new factor that I just found out is that the balancer chain tensioner (we have 2 chains that run our cars...a timing chain, and a balancer chain that is run off the cam and is only for the 2 balancers and the WP) is oil pressure regulated. As this tensioner wears out or the tiny oil holes plug up because of lack of oil maintenance, the balancer chain can easily skip a link...thus getting the engine out of balance and creating some major vibration issues internally that many people here won't notice. This is what I think has happened to my balancer and will find out more this weekend as I'm tearing apart my timing chain.
At any rate, follow the link below to the Solstice forum to see what we came up with...
Here's a good read: https://www.solsticeforum.com/forum/...ps-fail-74909/