Toyota Valve Stem Seal Seating Tool

Update 06/26/2025: I bought some more Monkey Wrench Racing seals and it looks like they have switched the exhaust (blue rubber) to be the same material as the intake (brown rubber). As such, all 16 of the brown ones use the same intake seating tool I made. I reached out to them about it and they said that the brown rubber is a superior material to the blue. Obviously this update probably won't apply to other manufacturers of valve seals however I did find that the intake seating tool does still work for the newer ones I bought.

Update Update: I purchased the Monkey Wrench Racing seals and the intake and exhaust are just ever so slightly different in diameter with the Exhaust being almost .5mm larger OD. So I have attached both an exhaust and intake version. Both have embossed text to differentiate the two (in = intake, Ex = exhaust).

I'm not sure if the OEM seals are the same but I do know that the OEM seals do vary exhaust vs. intake.

For FYI:

Exhaust tool ID: 13.15mm
Intake tool ID: 12.75mm

Both spring collars are the same OD. Note that my printer's resolution isn't the greatest, both of those ID's are .4mm larger than the actual OD of the seals. I am attaching the .step files just in case you need to adjust for your application.

I used a rubber mallet to give some loving taps to fully seat the seals. Valves are in place and the seals are nice and straight.

Update: OEM vs. Aftermarket collar springs differ in size. I updated the through hole to be larger for certain Aftermarket collar springs.

I saw that minus an official tool some people recommended a socket that fit the seal. I wasn't having luck with that so I made this to ensure that the seal would seat correctly and evenly. I used it on a Corolla 1ZZ-FE but from the part fitment for Toyota OEM seals this should work for almost every Toyota engine since they use the same seals throughout.

This is designed to have a slight interference fit with the seal so it would hold it in place while I positioned it over the seat. It might need tweaking for your printer to do a small interference fit. You could also try adjusting the scale in your slicer to get it to work.

I printed at 15% and it works just fine. I haven't done all 16 valves yet (waiting on replacements for the ones I mangled). But I will update if there are issues. 15% feels pretty solid.

I designed this in NX but I am attaching the step file if you need to make adjustments for your particular valve stem seal. If you would like or need a different format, just let me know and I can add that as well.