Weinman Q26-178-Y35 Mechanical Seal 1.50 in Shaft
This is the mechanical seal Weinman lists as part Q26-178-Y35, sized for a 1.50 in shaft, with Carbon, Ni-Resist and Buna-N components. The sealing happens across a lapped face pair so flat that the film of liquid between them is thinner than a human hair.
Nothing kills a mechanical seal faster than running dry. Without liquid between the faces the film is gone in seconds, friction spikes, and the carbon face heat-checks or the seat cracks. After that the seal drips and will keep dripping. Abrasives do the same job more slowly, scoring the faces until they no longer mate, and a hardened elastomer boot lets the rotating face stop tracking the shaft.
Shaft size and elastomer both have to match. This seal is built for a 1.50 in shaft, and the Carbon, Ni-Resist and Buna-N specification sets the temperature range and the liquids it will tolerate. Weinman lists the same shaft size in several compounds, so confirm both before ordering.
Key Features
- Genuine Weinman mechanical shaft seal assembly
- 1.50 in shaft - matches the original shaft dimension
- Carbon, Ni-Resist and Buna-N construction
- Direct replacement for the original Weinman seal
- Spring loaded and self-adjusting as the faces wear
- Supplied complete - rotating face, seat and elastomers
Applications
- Weinman pump rebuilds and overhauls
- Curing a persistent drip from behind the pump casing
- Recovery after a dry run or a lost prime
- Replacing seal faces scored by grit or abrasives
- Planned maintenance on duty and standby pumps
- Industrial, marine and dockside pump installations
Specifications
- Brand: Weinman
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: Q26-178-Y35
- Part Type: Mechanical shaft seal
- Material: Carbon, Ni-Resist and Buna-N
- Size: 1.50 in shaft
- Condition: New
Frequently Asked Questions
Q: How long should a mechanical seal last?
Years on clean liquid with a flooded suction. Life falls sharply with abrasives, with frequent starts on a starved inlet, and with temperatures near the top of the elastomer rating. Most premature failures trace back to operating conditions rather than the seal itself.
Q: A few drops appear when the pump first starts. Is that normal?
A very light initial weep while the faces bed in can settle within an hour or so of running. A steady drip, or anything that continues beyond that, means the faces are not seating and the seal needs to come back out.
Q: How do I know the seal is what is leaking?
A shaft seal leak shows up as liquid finding its way out around the shaft behind the casing, often worst just after shutdown. A joint gasket leaks along the split line between castings and does not change with shaft rotation.
Q: What ruins a new seal fastest?
Running the pump dry, even briefly. The faces depend on a thin liquid film for both lubrication and cooling, and seconds without it can heat-check the carbon. Close behind that are grit in the liquid and an elastomer that is wrong for the chemistry.
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 mechanical seal before you order.
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