That would be about 125 ft-lbs., then.
I could see an O2 sensor being somewhat tighter than this,
due to heat cycling and exhaust gas chemistry effects.
I used a pulley that I use to pull a downed Moose when I go
It has a scale on it. I hooked the end of the wrench,
wrapped the rope
around the fixed pipe in the garage and turned on the motor
the rope. I stopped when the motor registered about 125lb.
eactly 1/8 of the pressure at the hook. The wrench is about
(that's the radius R). Torque = R x F.
Here's a trick that's worked for me in the past (requires the sensor to
be in a suitably accessible location):
1) Raise car so you have room to access the sensor
2) Apply socket, ratchet and cheater bar to the sensor (snip wire so you
can use regular socket, not O2 sensor socket)
3) Place jack under cheater bar end and use jack to load up the assembly
good and hard, with socket turning in the LOOSEN direction
4) Whack exhaust pipe with at least a 2lb hammer -- hard -- immediately
adjacent to sensor.
5) Sensor should crack loose with a bang (keep out of the way of things
that may suddenly move in unexpected ways!)
6) If not, repeat from #4 as necessary.
Another trick that can work is to TIGHTEN the senor first, THEN try to
loosen it. If you can get a fastener to budge a bit in the tighten
direction, that increases the chance of getting it to move in the other
And if you end up stiripping the hole, no worries. A spark plug tap will
fix that with ease.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.