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-   -   4.7L head removal help (http://www.jeepgarage.org/f181/4-7l-head-removal-help-38984.html)

05WK4.7 03-15-2012 01:36 PM

4.7L head removal help
 
ok so i am having a big problem i have a 05' jeep grand cherokee laredo 4x4 with the 4.7L and it recently started over heating and i had it taken to my mechanic to get worked on and he called me and told me it had combustion issues cause the heads were warped. he said the heads needed to be taken off and re-surfaced and pressure tested. me and a friend got the engine taken apart down to the heads and we ran into a wall, we cant get the cam gears off there are 3 holes in the drivers side cam gear and one hole in the p/s cam gear. i bought a face spanner wrench on sears.com it was a 1 1/4 wrench but it is just a tad to small so now i dont know what i need and im completely lost. none of the auto part stores here rent one and the sears dont have them so i have to go online to get it. i was hoping someone on here could tell me what i need cause my mechanic tells me to just put a prybar in there and hold it but they are aluminum and i dont have 1grand for a new head if something goes wrong. if anyone knows the right tool o need or could get me a part number i would really appreciate it. thank you

2005JGC 03-15-2012 03:29 PM

Re: 4.7L head removal help
 
hopefully you left all the timing chains on as iirc there is only holes in the bank1 cylinder head for a spanner wrench, then for the bank 2 you just hold bank 1 to loosen... doesnt work when there are no chains holding everything together. You should be able to find an adjustable spanner wrench, something with one solid arm that goes up to the handle from the pin then a separate arm that pivots mounted to the solid arm this way you dont need an exact distance between the pins. ultimately this would be my suggestion as the only other suggestion would be to grab the cam (away from the lobes) with some good adjustable pliers or something like a monkey wrench, make sure to stay away from the lobes if you attempt this and attempt at your own risk! ive never had a problem grabbing a cam BUT i also dont break the cam gear bolt loose while holding it there either.

05WK4.7 03-15-2012 04:03 PM

Re: 4.7L head removal help
 
all the chains are still on and the tensioners are still on.

scjeep4.7HO 03-15-2012 07:34 PM

You have to loosen your chain guides to pull the heads and that will give you some chain slack which should let you just wiggle the cam gears off. They are not pressed on or anything. Zip tie you're chain to the cam gear before you pull it off so that it's easier to reinstall without meeting up the timing and keep some tension on the cam chains to the idler sprocket in the center of the engine, and you can lightly tap the gear with a rubber mallet if you have to to get it started to move. The passenger side has an alignment pin on the camshaft too.

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2005JGC 03-16-2012 12:08 AM

Re: 4.7L head removal help
 
his problem is getting the bolt loose... not getting the gear loose from the cam.

scjeep4.7HO 03-16-2012 02:00 PM

Re: 4.7L head removal help
 
You can hold the cam in a strategic location (on the body of the cam between the cam journals) with a pair of large channel locks (or whatever tool you may prefer) and then loosen the cam sprocket bolt..


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