Busted Danville pinned pump
- Thread starter quinton
- Start date
I had a welded pump on my built motor.
I raped the stock pump for 190k with tons of 4000+ rpm runs on the stock pump and no issues with mine, my LMM has had a few 4000+ hits and no problem.
I raped the stock pump for 190k with tons of 4000+ rpm runs on the stock pump and no issues with mine, my LMM has had a few 4000+ hits and no problem.
Yes, unfortunately we can't control the out sourcing that ACDelco and many of the other big name OE manufactures are doing these days so it definitely has an impact on things. There isn't much I can say about it other than we will get it taken care of. We have only had a handful of them fail out of the hundreds that are in the field doing there job. The issues with the waterpumps is they are just like turbos except the water pump is mechanically hooked to the motor so there is no give. Waterpump pressure measured in the housing right before the oil cooler pipe attachment ranges from 1-2psi at idle all the way up to 90+psi at 4700rpms and when the trany shifts or you chop the throttle all that pressure wants back out. Pretty harsh place for them to live in and makes it that much worse when the manufacture cuts corners to save a buck or two.
Mark.
There possibility of plumbing a relief valve?
Guessing that's 90psi with one or both tstats closed..
There possibility of plumbing a relief valve?
Guessing that's 90psi with one or both tstats closed..
Technically yes but the pressure is what helps with the cooling process so if you remove it then you will lose some of it. I don't know where the crossover is between the two.
I would be questioning that statement in itself if I were you.
Hundreds maybe thousands of people pull and race and some also DD their trucks with bone stock pumps and never even have a leak let alone the level and amount of failures that you have had.
Also for many years almost nobody was doing this mod to the pump and spinning high rpms without issue. It wasn't until a few pullers had them come apart, with the extended periods of high rpms that they do, and so then start welding impellers did it catch on as the thing to do. Many see it today as preventitive. Especially considering the pia factor to replace it. Myself I'm not sold on the idea everyone needs it.
So, not saying you're doing anything wrong at all. Maybe it's just bad luck, maybe delco quality control or their pumps aren't what they used to be. Maybe we are running these engines different from how we did 10 years ago.
All I know is I'd be looking a little deeper into my engine if I were you. Myself in my LBZ I had numerous pulls and passes up to 4000 rpm and the original pump was still in the engine with 200 000 miles on it give or take when the crank broke. Never even leaked a drop.
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Some people have good luck some people have bad luck. I know quite a few guys that have busted a welded pump, and this is just local. 10 years ago we weren't running the power we are now, let alone the amount of built trucks today vs then. It's a matter of luck just like anything when it comes to racing.
I myself would be looking for a reason there's excessive pressure in the cooling system. Could very well be another issue causing the repeated water pump failures that you havent found yet.
Obviously the Danville one would have nothing to do with a engine problem. The weld broke holding the dowel in. My housing you can see how it just ate the dowel as it worked it's way out. Now if snapped the pin ya I could see it then.
I always thought those pins were press-fit.
Im going more off what Mark said about the pressures in the cooling system and what you said about having three different pumps fail. You very well could have another factor at work here that hasnt been discovered yet.
Not saying that lets the Danville pump off the hook, but I think its prudent to start doing some research as to "why".
Im going more off what Mark said about the pressures in the cooling system and what you said about having three different pumps fail. You very well could have another factor at work here that hasnt been discovered yet.
Not saying that lets the Danville pump off the hook, but I think its prudent to start doing some research as to "why".
Oh I understand. After the second pump busted I searched through cooling system, I replaced radiator, thermostats, checked oil cooler, hoses for a rag or something and nothing. Thought it might be headgasket but checked that also.
I was thinking you have a head lifting enough to over pressure the system but not enough to cause a definite, definable problem.
Did all three failures happen after doing the same things with the truck (ie...racing, high-hp run then let off throttle quick, burnouts, etc)??
Im not accusing, Im just asking.
Did all three failures happen after doing the same things with the truck (ie...racing, high-hp run then let off throttle quick, burnouts, etc)??
Im not accusing, Im just asking.
Ohh I see they have a solid pin and weld to to the impeller. I see how a casting, material, or case hardening could prevent a good weld now from the vendor. That makes sense. But why the heck not just drill a hole, install a roll pin. Seems like a much better option on something like this than a welded solid
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