block coolant drain torque spec
05-09-2023, 10:13 PM
#1
block coolant drain torque spec
Anyone know the torque spec to the coolant drain fitting directly above the oil filter / oil cooler? I went to the torque spec guide which said "Block Drain Bolt - 61" but 61ft/lb seems ridiculously high for these tiny threads. I got it to ~30ft/lb and it feels sketchy already.
pic (circled in red, not the exhaust mani stud):
pic (circled in red, not the exhaust mani stud):
05-09-2023, 10:50 PM
#2
nevermind on the 61ft/lb, that's for the block drain cap/bolt. does anyone have the torque spec for the threaded barb fitting circled? i think where it's at ~30ft/lb is fine especially with the hondabond on the outter half of the threads as pictured. gonna leave it as-is unless if someone has a reason otherwise 
05-10-2023, 08:12 AM
#3
30ft lbs is plenty, maybe too much, that 60ft lbs is for the bolt on the block below the headers it lines up with the lower manifold stud, it is visible in the picture.
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dagle (05-10-2023)
05-10-2023, 08:26 AM
#4
yeah agreed. i found the thread pitch but not a torque spec for anyone that ends up here. it’s m18x1.0 and for reference the largest comparable size w/ a torque spec was like m8x1.0 which is about 20ft/lb. with the added leverage of m18 being a bigger diameter, i would tread very carefully. 20ft/lb+hondabond is plenty for this fitting/bolt IMO since it’s weakly pressurized (it’s a barb fitting after all.
05-10-2023, 11:40 AM
#5
Is it a tapered thread, similar to pipe thread?
If so, torque enough for thread sealant to seal. No further necessary.
If so, torque enough for thread sealant to seal. No further necessary.
05-11-2023, 06:57 PM
#6
didn’t look tapered but my eyes are awful, compared to the width of the pipe it didn’t appear so, but it could be optical illusion since the threads are super fine. hand tight with sealant would be sufficient in my opinion too*
05-12-2023, 01:23 PM
#7
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Assuming you are using the correct thread and you're using a small amount of Hondabond on the threads, 25 to 30LB-FT should be more than enough.
Its a hollow fastener, so it can't take much torque.
If it leaks from under torquing, you can always incrementally increase torque.
Conversely, If it breaks from over torquing...well, you can only weep while you mourn.
Don't use PTFE tape on straight threads. That's not what its for.
Its a hollow fastener, so it can't take much torque.
If it leaks from under torquing, you can always incrementally increase torque.
Conversely, If it breaks from over torquing...well, you can only weep while you mourn.
Don't use PTFE tape on straight threads. That's not what its for.
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