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Quincy 210 oil leak

g13092

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Joined
Jun 14, 2005
Messages
20
Location
Southeast Wisconsin
Picked up this nice frankenstein featuring a Quincy 210 ROC3 and a Century 1.5hp motor. There's no unloader on the pump or in the pressure switch. Hand writen notes on the pressure switch say 120 in, 150 out. :censored: No rusty water came out of the drain, but I did get more water than I'd like. So, hydro test is up before we go any further. Meanwhile I might move the pump to another tank.

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Quincy didn't have much data on file. It seems to be 1969 to 1971 vintage. I compared it to a QR-210 & that's capable of 4.8 acfm at 100psi, 1.5hp motor, and pump rpm of 691.

IMG_20230423_174411279_HDR.jpg
Oh yea, a broken foot. Anyway, the subject, leaking oil. There's some seepage from that little brass plug on the lower right of the pump. Just above the right mounting bolt, just right of the lower right oil pump cover bolt. I think this is a plug from cross drilling the oil passages to the hydraulic unloader valve mounting surface. You can just make this out on the right side of the pump, a few slotted head screws. There's an identical plug on the right side, which I think completes the drilled passages. The problem is that these plugs weep a bit of oil when running.

What do you imagine is the best way to solve this? I could try to dimple the plugs a tiny bit. I could pull them, tap, and insert a setscrew with some sealant. I don't really want the chips from drilling and tapping if I can avoid it. I could JB Weld. WDYT?
 
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The Tool Tyrant

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I wish I could answer your issue, but I see nothing shown in the oldest ROC 5 parts manual. I'd contact Quincy first and find out exactly what type of plug they are. They look like the same plugs @ 6:00 & 12:00 on the bearing carrier (oil pump cover) Let us know what you find out.
 
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g13092

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Joined
Jun 14, 2005
Messages
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Location
Southeast Wisconsin
Quincy didn't offer anything useful. I agree, similar plugs on the bearing carrier. I gave the leakers a little tap with a punch and hammer. They moved inward really easily :oops: Also they still leak. I'm going to try to pull them out and take a gander inside. Maybe they can go back together with red threadlock, which is also said to be used for cup / core plug sealant.
 

Jswain

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Apr 26, 2013
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Calgary, AB
If you can get them out I would use permatex or something similar on them before putting back in. Most compressors I've seen any of the bolts that go all the way through into the case have some sort of gasket maker on them so that's what I've always used with no leaks.
 
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g13092

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Jun 14, 2005
Messages
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Location
Southeast Wisconsin
I just finished drilling the plugs and taping the holes. Shortened some appropriate bolts to function as plugs & made some copper washers, as that's what seals the oil pressure adjuster. If that don't work, thread sealant or Teflon tape!

@The Tool Tyrant , any info in your documents on oil capacity? The dip stick looks home made and rather short...
 
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The Tool Tyrant

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I just finished drilling the plugs and taping the holes. Shortened some appropriate bolts to function as plugs & made some copper washers, as that's what seals the oil pressure adjuster. If that don't work, thread sealant or Teflon tape!

@The Tool Tyrant , any info in your documents on oil capacity? The dip stick looks home made and rather short...
Nothing in the parts manual on oil capacity, but I have a later 210 and I can tell you the dipstick length from the top of the case to the bottom of the dipstick is 5-3/8", the low level mark is at 5-1/4" and the upper mark is 4-7/8"
Hope this helps.
 
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g13092

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Jun 14, 2005
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Location
Southeast Wisconsin
Finally got er pressure tested (homebrew hydro to 250), cleaned up, and back together...1000002030.jpg

Quick test fire and 😭

Wire wheel must have knocked some rust chunk lose. Now she leaks. So much for that. Saving the pump, motor, and other stuff, the tank is going out to pasture...

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honestly, I don't know how wire wheel would have loosened that chunk about the size of a 6d finish nail yet it still passed the pressure test. Looks like it fell inward..
 
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g13092

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Joined
Jun 14, 2005
Messages
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Location
Southeast Wisconsin
That's the bright side! Much better at 30psi now than full pressure later... I think that rust chunk was sealing up before paint prep because of the water pressure behind it.
 
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