By your description it should have worked just fine. Should not require Permatex in this application. Are you sure you had the bolts tight enough?
ps: use anti seize on those bolts.
Yessir, I'm fairly certain I had them snug enough.
Anyone know where I can find this thick rubber gasket? Neither SOR or CCOT has them.
Edit: It looks like FJParts.com has the thick rubber gaskets. I just ordered one and will report back. Thx.
Yes, the Parts catalogue shows 16341-60020 as the sandwich gasket between the two halves of the 2-bolt thermostat housing.
That factory gasket is 1mm thick and made of typical gasket fiber.
My question remains: why do some gasket sets include a 3mm thick rubber gasket for this use?
This rubber gasket is NOT 16341-60020 unless there has been a revision from the factory in the thickness and the material it uses for this purpose.
Whether using the above-referenced upper and lower 2-bolt housings, or their variations allowing oil coolers, BVSVs, etc., the gap between the two halves is usually too large to be fit with a single 16341-60020 fiber gasket when also using the rubber gasket above the factory 180*F thermostat. The fiber gasket DOES fit correctly without that rubber gasket above the thermostat, and perhaps this is used in hot-climate areas not needing a cabin heater, or anyone deciding to not run a thermostat (not advised).
This also remains true if substituting the factory 190*F thermostat as in the 8/80 and up 2F engine. (It appears the 190*F thermostat was introduced to help keep emissions in line during the "spaghetti years," where Toyota continued to struggle meeting stricter emissions standards in the US, Australia, and Europe.)
So................who is making this rubber sandwich gasket, what is its purpose, why is it included in some gasket sets, and does it have an official part number? Is it a cheap aftermarket substitution? Or should we all use the single fiber gasket and crank-down on those bolts to stop leakage? Is that part of the reason so many bolts shear-off when being removed? Anyone?