Ever seen this before?

[69hugger]

I have heard of it happening, but never actually seen it...

Was driving the Camaro (pretty hard) yesterday, when I noticed the temp gauge was pegged. Pulled over to diagnose... the radiator was not that hot, but the motor was cooking.

Limped it home the 2 or 3 miles, coasting with the motor off as much as possible. In doing so noticed there was no heat from the heater either.
The radiator fans were blowing cold air, but the motor was very hot.

I could only come up with there was no coolant circulating. But the pump was running as normal. No noise, no wobble, no leaking. I removed the belt & the pump pulley spun just like before, smoothly with no noise or looseness. This is a Stewart water pump, supposedly the best pump made.

I called Stewart this morning. I was told their pumps make so much water pressure at high rpm’s that it can sometimes shear the impeller. They only see it happen once or twice a year.


2 hours later…..





Just something to keep in mind for those that run at high revs for extended periods.
This occurred while street driving, with some 2nd & 3rd gear blasts. My rev limiter is set at 6000 rpm's.

I've never seen this before, and wouldn't have believed it if I didn't see it myself.

The fix is Stewart is upgrading my pump to a Stage 4, which has a larger shaft, and a CNC billet impeller. Cost is about $150 to do so.

Just FYI...


Bill