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Smitten 05-11-2019 12:40 PM

Had a water pump fail.
But not in a way I've ever seen before. I was leaving Lowes and got on it a bit, running up to 40 in 1st, then, boom, this happened. The pump is a little over 1 year old, I run a/c which was on, and an Eaton pump with a 140 amp alt. The a/c isn't involved with the wp pulley of course, but I do have a 6 blade mechanical fan, which seems to move a fair bit of air especially at higher revs. Looks to me like a casting defect. Any other theories?

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Turnall 05-11-2019 12:44 PM

Bearing seized maybe?


Smitten 05-11-2019 12:58 PM

The bearing appears to be fine. I.E. it spins with not much effort. What resistance there is seems reasonable considering the snout is likely deformed now.

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patrickstapler 05-11-2019 01:37 PM

Stock pulley setup or some sort of self tensioning setup? How tight were the belts if manually adjusted? What brand of pump? Appears aluminum. Seems like there was another thread within the last couple months with a similar failure.

cougar70 05-11-2019 02:51 PM

Did the fan hit anything after it came apart? Consider yourself fortunate if it didn't.

Smitten 05-11-2019 03:08 PM

Stock pulley setup, maybe a little on the tight side of the alt to prevent squealing (140 AMP) offset somewhat by the Eaton ps pump pulling the other way. Pump was an aluminum Cardone Select, cheap, maybe too cheap.

Nothing else was hurt with the exception of the wp pulley. Grooves got cut in it from the balancer but no radiator contact. The pulley will be replaced. I was fortunate.

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cougar70 05-11-2019 03:46 PM

Smitten 05-11-2019 04:03 PM

I agree but isn't the second picture a cast iron with backing plate? I haven't found a cast iron wp that will fit in where the aluminum one is supposed to be installed. Are there better aluminum wp available at 'reasonable ' costs?

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Nailbender 05-11-2019 05:10 PM

I'm using the same Chinese water pump on my 65. They are all same pump from the same casting regardless of what it says on the box.

The one linked the above post is cast with a backing plate and will not work.

The gates pump looks interesting. Has the cast iron impeller instead of stamped steel one the china pumps have.

Now that I've seen your pump fail I have something else to worry about at next Sunday's autocross when turning 6200rpm.

PA_cob 05-11-2019 05:35 PM

38 Attachment(s)
Severy weeks ago mine failed very similarly. It was a parts store water pump that I got from Advance Auto about a year and a half ago. The pump impeller actually rubbed on the timing cover. The noise it made when the part of the housing broke off was crazy. Sounded like a gun going off in my engine compartment.

2nd 66 05-11-2019 07:12 PM

I run that style pump 30k ish on my old 289 and then transplanted for several more thousand on the "new GT40P with out issue ,actually developed a small drip one winter but "fixed" itself :shrug: No real load on it though, no fan just an alternator

66#3 05-11-2019 07:32 PM

Look at the failure face. If it is uniformly rough and looks like sand, then it was probably an instantaneous failure. If you see a portion that looks burnished / smooth, it is probable that it started failing there. A crack starts, then the flexure "hammers" the cracked surface so that it gets smooth. This continues as the crack slowly opens, burnishing that surface until ultimate failure occurs. You'll see a smooth / hammered surface next to the rough instantaneous failure surface.

If you learn that it cracked and then over time propagated, then look at the casting at the smooth area to see if there are any voids or other defects. I'd suspect that an instantaneous failure with no crack propagation is a design defect- it is just too thin in a critical area.

66whitepony 05-11-2019 09:25 PM

I have this pump. And have been running it for 4 years or so with no issues. I keep my foot in the throttle regularly.

Turnall 05-11-2019 09:47 PM


Originally Posted by 66whitepony (Post 10159410)
I have this pump. And have been running it for 4 years or so with no issues. I keep my foot in the throttle regularly.

Do they have one with a backing plate?

I think this is what I'm looking for...

It's a FlowKooler water pump and has the backing plate...


Nailbender 05-11-2019 10:52 PM

I went ahead and ordered the gates pump from Rockauto as a backup. I'm thinking the really expensive Edelbrock pump might be the best for peace of mind. Made in Merica!

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