Burks 2-31003-166 Buna-N O-Ring Gasket dash 166
This is the Buna-N o-ring gasket Burks specifies as part 2-31003-166, AS568 dash 166, about 7.48 in inside diameter. Its job is simple and unforgiving - hold pressure at a joint that has to come apart again for service.
Elastomer seals age whether the pump runs or not. Heat and the pumped liquid slowly harden the compound, the ring takes a permanent set in the shape of its groove, and it stops springing back when the joint is opened. A ring that has gone hard and flat will usually seal again once, and then weep a few days later under pressure cycling. That is why it is standard practice to fit a new one every time the joint is broken.
Burks supplies this size in more than one compound, so the material is part of the part number, not an option. Buna-N here sets the service temperature and the range of liquids the joint will tolerate. Fitting the same size in the wrong compound is one of the more common causes of a seal that fails within weeks.
Key Features
- Genuine Burks replacement in Buna-N
- AS568 dash 166, about 7.48 in inside diameter
- Direct replacement for the original Burks seal
- Static seal designed to be renewed at every teardown
- Holds pressure without over-tightening the joint
- Inexpensive insurance against a leak after reassembly
Applications
- Burks pump service and overhaul
- Reassembling a pump after a seal or impeller change
- Curing a weep or drip from a casing joint
- Replacing a ring that has gone hard or taken a set
- Restocking a spares kit for planned maintenance
- Industrial, marine and dockside pump installations
Specifications
- Brand: Burks
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 2-31003-166
- Part Type: O-Ring Gasket
- Material: Buna-N
- Size: AS568 dash 166, about 7.48 in inside diameter
- Condition: New
Frequently Asked Questions
Q: How can I tell whether a leak is this seal or the shaft seal?
A static joint seal weeps along the split line between two castings and does not change with shaft rotation. A failing mechanical seal usually drips from underneath the adapter behind the casing and often gets worse as the pump runs and warms up.
Q: Should I lubricate the ring before fitting it?
A light smear of a grease compatible with the ring compound helps it seat and stops it rolling or pinching as the joint closes. Avoid petroleum grease on EPDM, and avoid anything that will contaminate the liquid you are pumping.
Q: The old ring looks fine. Can I reuse it?
It is not worth it. A ring that has been under compression has already taken some set, and the cost of a repeat teardown is far higher than the ring. Seals of this type are treated as single-use items across the industry.
Q: What tightening sequence should I use on the joint?
Draw the fasteners down evenly in a cross pattern in two or three passes rather than pulling one side home first. Uneven closing is what pinches a ring and leaves it nicked on one edge.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct O-ring before you order.
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