FJ62 thermostat replacement quick write up
- Thread starter Randy88FJ62
- Start date
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RevISK
SILVER Star
Did you ever find the part number for the bolts? Would be good info for this thread.
Personally never broke a bolt on a thermostat housing but I always use anti-seize on most everything. Learned that when working on tractors and boats.
Same here, though I still try to avoid reusing bolts if I can. Broken a few on reinstallation before due to annealing, so I try to just go new when it's a small investment.
mr spook , no cold spec. gaskets that i know of
but ....
since toyota's current thermostat housing's hardware is circa. era. hot-dipped galvanized outdated simple minded weak and sadder then sad ....
i have snapped my share of not so old 12mm HEX sandwich bolts , and snapped a few lower housing block face bolt ears off too in the past ...
a single lock washer is outdated engineering technology , they bite on the way out because nobody thought about that in 1961 ....
a wider flat washer distributes the torque yield evenly over a larger surface area , and the lock washer does not bite into a smooth and same grade steel smooth flat surface
i wondered why one day , and after doing what i do we now have a better choice .
better is better , stronger is stronger and things like JIS double SEMS washers , and the highest salt spray rated surface treatment possible all add up to
SNOW VERSION grade modern age 2025 updated and upgraded for 1961-1990 F , F1.5 , 2F 3F carb 3F-E series engines ....
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12mm hex / M8 sandwich bolts : 91611-B0845 = JIS #4 mark head / my updated = JIS #7 mark head
14mm hex / M10 block face bolts 91611-61025 = JIS #6 mark head / my updated = JIS #8 mark head
- Surface treatment : violet blue silver zinc = highest salt spray rating / verses toyota galvanized = low salt spray rating
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sand
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