PSS Maintenance Kits, Shaft Diameters, 3/4" to 3-3/4"

• Inner Diameter = Size of Shaft
• Outer Diameter = Stern Tube Diameter
• 1 Bellow
• 2 O-Rings
• 5 Set Screws
• 4 Hose Clamps
• 1 Tube of Thread Lock
• 1 Allen Key

PYI offers a Maintenance Kit that includes the items you need to properly maintain your PSS Shaft Seal. PYI suggests inspecting PSS bellows on a regular basis and replacing every 6 years.

What general maintenance should I be considering for a PSS Shaft Seal that is working perfectly well with no apparent issues?

Given the quality of the PSS Shaft Seal this is what we would expect where very little maintenance is generally necessary. Typically the carbon and stainless steel sealing components will not need replaced where we see many commercial vessels recording over 40,000 engine hours on original components. That said, we do recommend the rubber bellow component be replaced in 6 year intervals as precautionary maintenance kit for this replacement which includes the rubber bellow and all necessary hardware.

Can I re-use my set screws when making an adjustment or removing the PSS Shaft Seal?

PSS set screws

No, please be sure to never use the same set screw on the shaft twice. There are two set screws in each of the two holes in the stainless steel rotor. One is tightened onto the shaft and the other is tightened onto the first to lock it in place against the shaft. The set screws are made with a cup at the base that compresses into the shaft ensuring a secure grip. PYI's PSS Maintenance Kit comes with five new set screws included. When re-installing the rotor please use new set screws. In the case that you do not have spare set screws, the set screws in the rotor need to be reversed so there is an unused cup being compressed onto the shaft.