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Shutterstat Fluid Substitute
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By richard5933 - Saturday, October 26, 2019 9:32 AM
Anyone know what modern lubricant is the closest substitute for Shutterstat Fluid?

(Or, if Shutterstat Fluid is still available somewhere?)

I've got shutters on the radiator on my 1974 GM bus, and I'm working to get them fully functional again. They move freely, but I still have a few bugs to work out - one of them is adding lubricant to the reservoir.

By junkmandan - Saturday, November 02, 2019 2:05 PM
By richard5933 - Monday, November 04, 2019 10:54 AM
Thanks Junkmandan. I was thinking perhaps pneumatic tool oil, but ATF makes sense too. Do you think it matters which flavor of ATF?
By Wolfcreek_Steve - Monday, November 04, 2019 4:31 PM
richard5933 (11/4/2019)
Thanks Junkmandan. I was thinking perhaps pneumatic tool oil, but ATF makes sense too. Do you think it matters which flavor of ATF?
Use a flavor that was used back when shutterstats were common, probably Dexron I or II. Some of the later ATFs are synthetic or made for synthetic seals which a shutterstat wouldn't have.
By richard5933 - Friday, November 27, 2020 8:59 AM
Brief project update...

Never did get the shutters working - there were apparently problems other than just figuring out what fluid to use.

Finally found some Shutterstat Fluid - sealed can never used. The oil inside seems to be good and not gummed up. I was expecting an odd smell since it has a solvent content, but didn't expect that smell to be mildly similar to the smell of Windex. The closest thing I've found to it so far was Marvel Mystery Pneumatic Tool Oil. I'll run some side-by-side wicking tests to see how they compare.

The airline filter/oiler on my bus was leaking air pretty good, which is most likely why the system had been shut off. It has been on there unopened for 46 years, and on initial inspection the screws and fittings seem pretty well stuck and not keen to move. So, when I saw the NOS filter/oiler come up on eBay I got it just in case.

The air cylinder rebuild kit was ordered through Ross Air Works, and the Shutterstat itself was bought from C&J in Minnesota. The air cylinder currently works if I put air to it, but it seems wise to rebuild it if I have the parts. I'll probably replace the air lines themselves if there is any sign of dryness or cracking when I get things opened up.

The shutters themselves move freely. I've been keeping them lubricated and have moved them manually a few times a year hoping to get them working at some point. The fact that the shutters were in good condition is why I started this project, and now it seems like I've got everything in place now to get the shutters working again. Probably won't get to it till I start working on the bus in the early spring, but it's nice to be able to find all the parts and supplies needed. Then maybe I'll be able to keep the engine at operating temp in the colder months.