Posted by timcasbolt on May 27, 2023 at 13:00:51 from (24.112.172.23):
In Reply to: Bolt torque question posted by perryjosh64 on May 27, 2023 at 12:08:12:
Quote: perryjosh64 (quoted from post at 14:08:12 05/27/23) Replacing water pump on a 64 Ford 2000 tractor that started leaking. Figured I d go ahead and replace thermostat and hoses to. While replacing thermostat broke off bolt when I attempted to torque it to 30 ft lb. I assumed this was correct torque as my ford tractor shop manual FO-20 says "tighten the retaining cap screws to a torque of 25-35 ft-lbs" for water pump and both thermostat and water pump bolts are 5/16-18. I thought maybe it broke due to metal fatigue as I used the old bolts. Luckily I was able to get it out with vise grips and went and got new bolt for thermostat and water pump. Thermostat bolts are 5/16-18 1in and water pump are 5/16-18 1-1/4in long and all bolts are grade 5. However everything I find on general torque specs for 5/16-18 grade 5 bolts shows 157-209 in-lb (13-17 ft-lb).
So my question is do I need better grade bolts or is manual wrong for water pump screws torque specs?
I agree that 25-35 is correct for 5/16". Also, grade 5 should be just fine for that application. The old one must have been abused at some point in the past.
This post was edited by timcasbolt on 05/27/2023 at 01:02 pm.
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