66 427/390 water pump pulley wobble

[John B.]

Hello all,
On my 427/390 i have a wobble in my water pump pulley. The water pump has been recently rebuilt. As far as i know the pulley has never been damaged. I am wondering the best way to check for run out. Should i put a dial indicator on and check the shaft and/or the flange for run out? Is there a good way to check the pulley? And if it is the pulley can it be repaired or am i sol?

Thanks for your input and help.

Mike

[Mark F.]

Re: 66 427/390 water pump pulley wobble

Hello all, On my 427/390 i have a wobble in my water pump pulley. The water pump has been recently rebuilt. As far as i know the pulley has never been damaged. I am wondering the best way to check for run out. Should i put a dial indicator on and check the shaft and/or the flange for run out? Is there a good way to check the pulley? And if it is the pulley can it be repaired or am i sol? Thanks for your input and help. Mike

Hi Mike,

I have a similar issue on mine and here's a post I did with excellent answers and suggestions...
hope this helps...
PS - I have not gotten around to doing mine, but it's on my "things to do" list

https://www.forums.ncrs.org/showthre...+pulley+wobble

[Owen L.]

Re: 66 427/390 water pump pulley wobble

I think your first order of business is to separate the two components to see where the wobble is coming from. I'd remove the belts and pulley, inspect the pump flange face and the inside of the pulley for anything like a burr or schmoo of some sort. If you find anything questionable, use a file to smooth it off.

Use a dial indicator to see how true the water pump flange face runs.

If that checks out OK, it must be something to do with the pulley. Someone with a lathe should be able to mount it and check how the grooves rotate compared to the mounting hub.

[John B.]

Re: 66 427/390 water pump pulley wobble

Mark, Thank you so much for the information. I am going to give this a shot early next week. I will post my results.

Mike

[John B.]

Re: 66 427/390 water pump pulley wobble

Owen, Thanks for your input, i will give this a go and see what i come up with. I will post when i find the answer.

Thanks again.

Mike