Help! - Quincy 325 HP rod cap needed

[MEngineer]

All,

Your help would be greatly appreciated. I am in need of a replacement connecting rod cap for the high pressure piston on my Quincy 325 compressor.

I had it torn apart and was going to put it back together when I broke the rod cap. They are not sold separately from Quincy (I would have to buy the entire connecting rod assy) but the rod assy is only $450. Considering that I have $60 into the pump thus far, I am not sure I can justify it.

If I can't get another cap, my plans are dead in the water. I am hoping that one of you fine people may have one on one of your parts pumps that you would be willing to sell me. I would gladly pay for shipping + beer if you would send it my way no charge assuming you are not using it.

Thanks in advance for saving my ****.

 

[A_Pmech]

The rod caps are match machined to the rod. No two caps are interchangeable. That's why Quincy only sells the complete rod.

 

[MEngineer]

The rod caps are match machined to the rod. No two caps are interchangeable. That's why Quincy only sells the complete rod.

Well that is unfortunate....does anyone have a spare high pressure rod assy laying around?

 

[Murphy4570]

You'll have to send the rod to a machine shop. They can mill a new cap, bolt it together, and hone it to size. You will probably want them to balance the crankshaft assembly as well.

 

[MEngineer]

You'll have to send the rod to a machine shop. They can mill a new cap, bolt it together, and hone it to size. You will probably want them to balance the crankshaft assembly as well.

My initial feeling is that I would likely be better off just buying a new rod assembly for the price....shop time ads up fairly quickly?

 

[DSLTRK]

My initial feeling is that I would likely be better off just buying a new rod assembly for the price....shop time ads up fairly quickly?

$170

http://www.compressorpartsstore.com/Quincy-6442HPX-p/rod-325hp.htm


You're welcome.

 

[BillK]

You'll have to send the rod to a machine shop. They can mill a new cap, bolt it together, and hone it to size. You will probably want them to balance the crankshaft assembly as well.

That very rarely works out because most of the time the cap does not align with the rod across the parting line either. Very, very difficult to match used connecting rod caps to different rods. Same with main caps on blocks.

 

[MEngineer]

$170

http://www.compressorpartsstore.com/Quincy-6442HPX-p/rod-325hp.htm


You're welcome.

Thank you for that, saved my bacon.

 

[Murphy4570]

That very rarely works out because most of the time the cap does not align with the rod across the parting line either. Very, very difficult to match used connecting rod caps to different rods. Same with main caps on blocks.

Measure rod radius, duplicate - 0.005 to -0.010 undersize to hone to finish. Not a big deal. Hell, you could fabricate an entire rod if you want to. Worst case line bore it oversize and use appropriate bearing. Parting line isn't a big deal. Mill it flat. You're resizing the rod regardless.

Not a cheap option, but it can be done.

 

[Jim Johnstone]

Measure rod radius, duplicate - 0.005 to -0.010 undersize to hone to finish. Not a big deal. Hell, you could fabricate an entire rod if you want to. Worst case line bore it oversize and use appropriate bearing. Parting line isn't a big deal. Mill it flat. You're resizing the rod regardless.

Not a cheap option, but it can be done.

I'm planning to make a set of rods for a compressor I'm rebuilding. Certainly can be done, but like you said, wouldn't be cheap unless you can do the work yourself.