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Old 08-22-2009, 03:44 PM   #1
evo2rex
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Default Crank position sensor stuck

Got a crank position sensor cel and decided it was time for a new one. Everything was going smoothly until it was time to take the old sensor out...
the metal casing around the magnet somehow got stuck in the block...





Anyone have any ideas as to how I get that metal part out?
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Old 08-22-2009, 04:31 PM   #2
Uncle Scotty
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spray with some PB Blaster and wait an hour or so and start trying to work it out

you may have to carefully puncture it and pry it out
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Old 08-22-2009, 04:47 PM   #3
evo2rex
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thanks for the quick reply
gonna try some wd40... its pretty much the same right?
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Old 08-22-2009, 05:38 PM   #4
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Quote:
Originally Posted by evo2rex View Post
thanks for the quick reply
gonna try some wd40... its pretty much the same right?
no...it isnt

wd-40 is for getting tar and sap off the car or the lawn mower or a squeaky hinge on the bathroom door

PB Blaster is a serious penetrant for serious issues

you have an issue that you want resolved???

PB Blaster....Kroil.....LPS
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Old 08-22-2009, 05:54 PM   #5
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wd40 is pretty much useless for anything requiring lubrication. it is a solvent and water displacer first, anything else it might or might not do is secondary.

pb blaster is in a completely different league for things like this. You should NEVER work on a car without it!
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Old 08-23-2009, 10:11 AM   #6
Charlie-III
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Wondering what happened on this.

As to WD-40, I prefer Kroil but the others suggested are good as well.

Don't try to drive the remains into the engine unless you have the TB covers off, you would need to make sure you don't damage the sensor wheel.
You really need to pull the remains back out from the top.
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Old 08-23-2009, 12:44 PM   #7
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Does it look like there's some sort of white substance showing in the bore along the edge of the stuck cover? Could it be that someone who was there before had sealed the sensor with silicone?
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Old 08-23-2009, 12:55 PM   #8
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Quote:
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Does it look like there's some sort of white substance showing in the bore along the edge of the stuck cover? Could it be that someone who was there before had sealed the sensor with silicone?
I took the sensor out to clean it a couple of years back and didn't put anything on it that would make it get stuck... still can't get it out. how much clearance do I have under the sensor?
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Old 08-23-2009, 02:20 PM   #9
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Originally Posted by evo2rex View Post
How much clearance do I have under the sensor?
Not much, it depends on where the trigger arms are in relation to the remains of the sensor.
Worst case, ~0.060"
I would try a bit of heat on the aluminum before driving the remains towards the crank. The aluminum will expand a lot more than the remains, it should break the grip of corrosion.
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Old 08-23-2009, 02:22 PM   #10
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Does it look like there's some sort of white substance showing in the bore along the edge of the stuck cover?
Yes there is, it's called aluminum oxide which is the aluminum form of rust. It can be worse since there is also some dissimilar metal corrosion going on. This is why I buy Never-Seize in a big bottle.
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Old 08-25-2009, 12:01 PM   #11
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And......??????????????
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Old 08-25-2009, 02:00 PM   #12
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Quote:
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Yes there is, it's called aluminum oxide which is the aluminum form of rust. It can be worse since there is also some dissimilar metal corrosion going on. This is why I buy Never-Seize in a big bottle.
To me it looked like something was oozing from within the gap. But since no one else had worked on it, corrosion seems to be the only way to explain what happened. I wonder if the newer black-bodied sensors are more likley to corrode in place than the older brown ones.

One way of trying to dislodge the sensor housing could be to remove the timing covers, turn the crank to point the sprocket tabs away from the sensor, and push it out from the inside with some suitable tools (after penetrant soaking and/or heating).
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Old 08-25-2009, 06:33 PM   #13
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Got it out last night... couldn't have done it without the PB blaster. Ended up chiseling a pick into the side to bend the walls in, then used pliers to pull it free.
Thanks for all your help.

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Old 08-25-2009, 07:05 PM   #14
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Same thing happened on my car. Since I was rebuilding the engine out of the car, I just installed a new oil pump and new crankshaft position sensor.

I'd recommend spreading a thin layer of anti-seize lubricant around the sensor so it doesn't happen again.
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