crankshaft positon sensor replacement 4.0 WJ/WG - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

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Old 22-09-2013
PKWJ  PKWJ is offline
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Default crankshaft positon sensor replacement 4.0 WJ/WG

Well what a mongrel of a job. I have scoured the internet for best way to do the crankcase position sensor on a 4.0l WJ/WG and have put down below the mix of ideas I found best. Be ready for some swearing tight spaces and barked knuckles. Take about 2hr on a good run unless you do it twice as did wrong the first time!!! see step 6 below. A few ok u tube vids will help hard to find one site with all of below.

many may not know, but after maybe 150,000 miles this like the fuel pump can leave you stranded without warning. You will try to start the car and it wont happen.


1.jack up the front axle and support it as high as your stands will hold.
2.Your going to lower the trans crossmember with the jack. There are 8 total 15mm bolts holding it in. 4 on each side. You do not need to disconnect any wires, connectors or even the driveshaft, just lower slowly and carefully about 4-5 inches.
2a You now need to undo the bracket holding linkage to top of transmission and get it out of the way, 2 points of location one nut and one screwed into side of trans.
3. On the driver's side top of the bellhousing lives the sensor. Its held in with a 7/16" or 11mm bolt and small bracket. With the longest extension or a few put together and swivel, wrap insulation tape around swivel to reduce movement, remove the bolt and easily remove the sensor.
4. Swing the sensor over the trans . Go up to the engine compartment and find the connector. (Its behind the oil filter) You will see it. The connector is held in with a plastic locking stud. A flat head screwdriver will pry it off. Disconnect the connector and pull out the sensor.
5. Thats it! Do the reverse of what you just did and you're done!
Remember when you are securing the sensor, press down on it while tightening the bolt. The paper spacer that is glued to the new sensor needs to be touching. It will come off as soon as you start the engine.
6. This is why I had to do twice, It's good as long as you don't stick it in all the way. Put it in and screw it in place loosely; then pull it out as far as it will go and tighten the screw to hold it.

when you first look and find it seems impossible to get socket on this son. I did the go away and come back to it.

Goodluck my jeep now running better than ever!!

PKWJ
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Old 22-09-2013
Escapable  Escapable is offline
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Having read the FSM (for the WG) and having done this procedure twice on the ZG (same sensor and procedure, a rather inexpensive part for JEEP, I used the TRIDON one) I cant imagine why you needed to remove the crossmember.
I used a long extension (multiples actually) and a uni joint on the socket, the only hassle is to position the heat shield with the whole operation (on a cold motor as the exhaust is there) takes about 20minutes.
The FSM also warns about the paper spacer to prevent the sensor blowing when re-installed, this is why the new one comes with one.
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Old 22-09-2013
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Tried without dropping the cross member and even with my little girly hands and some tight maneuvering with the extension couldn't reach the socket etc up there and land on nut to undo. Maybe if I had a hoist and wasn't grovelling around on floor of garage it could be done. Maybe it is a GC WG/WJ thing, I did read several explanations for other jeeps that did not require dropping cross member.

Any others had a go?

PKWJ
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Old 22-09-2013
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Oh yeah while i think of it the description posted below came from a variety of US sites so keep that in mind where it talks drivers side.
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Old 23-09-2013
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my wj was done without doing any of that stuff took about half an hour.
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Old 23-09-2013
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Quote:
Originally Posted by mopar madness View Post
my wj was done without doing any of that stuff took about half an hour.
Yup .. as stated the ZG is the same and take about 20 mins after the first one (about 30).. with a long enough extension (join 2 together) and a uni joint it all is so easy ........
(hint: keep a spare for those special times, it will never fail again .. refer Murphy's Laws)
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Old 27-03-2014
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Quote:
Originally Posted by PKWJ View Post
Tried without dropping the cross member and even with my little girly hands and some tight maneuvering with the extension couldn't reach the socket etc up there and land on nut to undo. Maybe if I had a hoist and wasn't grovelling around on floor of garage it could be done. Maybe it is a GC WG/WJ thing, I did read several explanations for other jeeps that did not require dropping cross member.
PKWJ
Me also in the favor of this statement about the use of sensors.We need to use good quality of products.

Last edited by Mr Parker; 29-03-2014 at 03:49 PM.
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