'88 Pontiac - GM 3800 Engine
Trying to get to the CPS to change it- I can't get the pulley in front of
the sensor mounting bolts off, even with a good 1/2" air wrench. I have
already broken one socket. The 1-1/8" bolt is rusted on tight. Tried soaking
with penetrant over night. Could it be reverse threaded? Anyone have any
experience getting these loose? I don't want to break anything else. TIA
If you are talking about the harmonic balancer retaining bolt, the one you
need a 26mm socket for, it's tightened to 200-239 ft-lbs. Apparently you
need some sort of alignment tool to install the crank shaft position sensor.
I've had lots of experience getting these loose. You cannot
rely on a "good" 1/2 inch impact wrench...you must have
an "awesome" one. I've always had the best one's that you
can get....and have no problem getting these loose. Every
now and then, you get a tough one.....I oil the air wrench,
then I let it hammer away on the bolt in the "off" direction.
Then switch the air wrench over to the "on" direction and
beat away on the bolt for 2-3 seconds. Then switch back
to the "off" direction. I haven't had one yet that I couldn't
get off. But again, you must have a good air wrench.
Thanks for the responses. I got it off today doing exactly what Ian said.
After working on it for an hour last night and two hours today, it finally
broke loose and came out- and with standard thread. Sure have a sore wrist
though from all that hammering! The problem rust was around the outer edge
of the bolt's flange- not on threads by design. I didn't use 3/4" drive air
tool fearing I would break bolt off in the crank. Next time knowing the
type, strength and position of the bolt, I would just crank on it with all I
had. If on a vehicle I intended to keep- I'd probably change the seal while
there. This one wasn't leaking and I had too much time in it already. The
bracket was hard to get off and broke- a new one comes with the replacement
sensor, but if I had it to do over again I'd just leave the old bracket in
place. Sensor alignment is critical, but can be done by eye if you are
exacting and careful. Alot of the problem was from age and rust. Thanks
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