Routing was factory, the crank pulley has a wobble
CK5
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Water pump pulley walking off
- Thread starter 83ChevyK5Blazer
- Start date
That's some crazy stuff. Never seen one do that.
I would be curious to see the runout on the harmonic balancer and the crankshaft.
I would be curious to see the runout on the harmonic balancer and the crankshaft.
Something is causing the belt to flap at RPM. The constant smacking will need to be relieved somewhere. Saw one water pump brake like that. The tensioner seemed ok. But it would not hold a constant tension. Kind of developed a harmonic bounce. Found it with a Gopro under the hood.
That's what is going on, crank pulley is wobbling causing this i think
Broken flexplate? That’s what was up when I broke the water pump off the front of my 454 back in 85’
A first for me, we are getting it dropped at families house and coming back later for it.
The welded water pump.
And the water pump does its own ninja moves. Damn.
David
David
We made it home, this morning we punched 4 holes in the winch plate and attached a harbor freight tow bar, my father in law drug her home while i towed the uhaul with my wife's cousins truck.
Glad you made it. I certainly hope this gets figured out. To break a pump shaft, when hub wouldn't give. Something is really wrong, but not being obvious .. ....
Okay sooo.... 250-300 miles with out another issue.
I guess it's story time. So I will admit I have an issue with "good enough" in my building process.
When i put this engine in I used a kwik performance adapter kit for my serpentine accessories, including the spacer to allow the use of the sbc pulley off of the balancer. When I got the truck running 4 or 5 days before we drove it to Wyoming from Mississippi I had an issue keeping the belt on, problem was, the crank pulley was one rib off of the rest of the accessories. So i measured how much it was short, added 2 washers under each bolt between the pulley and spacer..... no more belt issues. Drove it to wyoming and daily drove it, took it on camping trips and wheeled it for 4 months.
On our return trip, i had the truck loaded down, and was pulling a loaded down 6x12 trailer. When we hit Texas, especially the area out side of Dallas we got into stop and go traffic, enough so i was using first to get the rig rolling, and on and off the clutch a lot. That's when water pump #1 had the hub walk off. My wife ran to summit racing got another pump, and belt and we took off again. 30 miles later pump #2 failed, hub walked forward off the shaft same as pump #1.
We limped it along shutting it down as it got to temp for over an hour until we got to a hotel well past midnight.
Pump #3 we had @AgDieseler weld the hub onto the shaft, it looked good, we hit the road, made it out of Dallas finally and hit stop and go between Dallas and tyler tx.
This pump was shaken to the point it cracked the pump on both sides. The pulley sheared 2 bolts and the other 2 nearly crewed through the face of the pulley.
We admitted defeat at that point and had it towed home.
At home when there was time to dig into it we got pump #4, and I took the time to look over everything. I never measured run out, but by eye the crank pulley had a bit of wobble. So i took it apart, all three bolts were still tight. I called kwik, and the owner answered right at opening time, he was very helpful and even emailed me a sheet of measurements on how that pulley should be sitting.
When I took the pulley, 2 washers, and spacer out i set it on the hood. Looking at it from the side I found my issue. Using 2 washers allowed the flange on the pulley to just barely engage the hole in the spacer.
My best guess is all the on and off clutch action, under load, had let the pulley slightly roll out of center but stay close on the bolts.
In the end I put one washer between the crank and spacer, and one between the spacer and pulley. This gave me my distance and allowed both hubs to engage.
Not the correct way to solve it, but for the time being it does work.
A new water pump pulley was bought and now it seems to be doing okay. The belt tensioner runs with out jumping and so far, knocking on wood, no parts have came off.
I guess it's story time. So I will admit I have an issue with "good enough" in my building process.
When i put this engine in I used a kwik performance adapter kit for my serpentine accessories, including the spacer to allow the use of the sbc pulley off of the balancer. When I got the truck running 4 or 5 days before we drove it to Wyoming from Mississippi I had an issue keeping the belt on, problem was, the crank pulley was one rib off of the rest of the accessories. So i measured how much it was short, added 2 washers under each bolt between the pulley and spacer..... no more belt issues. Drove it to wyoming and daily drove it, took it on camping trips and wheeled it for 4 months.
On our return trip, i had the truck loaded down, and was pulling a loaded down 6x12 trailer. When we hit Texas, especially the area out side of Dallas we got into stop and go traffic, enough so i was using first to get the rig rolling, and on and off the clutch a lot. That's when water pump #1 had the hub walk off. My wife ran to summit racing got another pump, and belt and we took off again. 30 miles later pump #2 failed, hub walked forward off the shaft same as pump #1.
We limped it along shutting it down as it got to temp for over an hour until we got to a hotel well past midnight.
Pump #3 we had @AgDieseler weld the hub onto the shaft, it looked good, we hit the road, made it out of Dallas finally and hit stop and go between Dallas and tyler tx.
This pump was shaken to the point it cracked the pump on both sides. The pulley sheared 2 bolts and the other 2 nearly crewed through the face of the pulley.
We admitted defeat at that point and had it towed home.
At home when there was time to dig into it we got pump #4, and I took the time to look over everything. I never measured run out, but by eye the crank pulley had a bit of wobble. So i took it apart, all three bolts were still tight. I called kwik, and the owner answered right at opening time, he was very helpful and even emailed me a sheet of measurements on how that pulley should be sitting.
When I took the pulley, 2 washers, and spacer out i set it on the hood. Looking at it from the side I found my issue. Using 2 washers allowed the flange on the pulley to just barely engage the hole in the spacer.
My best guess is all the on and off clutch action, under load, had let the pulley slightly roll out of center but stay close on the bolts.
In the end I put one washer between the crank and spacer, and one between the spacer and pulley. This gave me my distance and allowed both hubs to engage.
Not the correct way to solve it, but for the time being it does work.
A new water pump pulley was bought and now it seems to be doing okay. The belt tensioner runs with out jumping and so far, knocking on wood, no parts have came off.
Cool stary bruh. 
I’m surprised Kwik Perf was ok with the washers and didn’t have a better resolution.
I’m surprised Kwik Perf was ok with the washers and didn’t have a better resolution.
They don't have any other solution. It's a difference in the balancer i think, but it works.
