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Replacing spark plugs on the 3.6 Pentastar

49K views 18 replies 13 participants last post by  Appst890 
#1 ·
I am not to the point where I need to change my spark plugs yet, but if any of you are, I found a good web site that has step by step instructions with photos. For those of you that are not very familiar with 3.6 engine, the intake plenum must be removed to access the spark plugs on the driver side of the engine.

Here is the web site.
3.6L Pentastar Spark Plug Step-by-Step Guide (with pics) | DS Jeeps
 
#3 ·
ug...such a pain for the right side....at least the stock spark plugs are rated to 120 000km
 
#6 ·
Total BS. There is not a need to design it this way. It just scares owners away from doing the job. Ford is the master of this with the transverse mounted 3.0 engine in front wheel drive cars. The 3.0 in the Ranger is not made like this and is simple to work on.
 
#7 ·
In my earlier reading about the 3.6, they warned that the spark plug tubes are very easily damaged. Be careful. And after seeing the drivers side, I'm not looking forward to it.

If anyone of us does this, we should make notes or video it.
 
#9 ·
In my earlier reading about the 3.6, they warned that the spark plug tubes are very easily damaged. Be careful. And after seeing the drivers side, I'm not looking forward to it.

If anyone of us does this, we should make notes or video it.
That's correct, here is an exerpt from the factory manual on removal of the spark plugs;

"

  1. Prior to removing the spark plug, spray compressed air into the cylinder head opening. This will help prevent foreign material from entering the combustion chamber.

  1. CAUTION:
The spark plug tubes (1) are a thin wall design. Avoid damaging the spark plug tubes. Damage to the spark plug tube can result in oil leaks.




  1. Remove the spark plug from the cylinder head using a quality thin wall socket with a rubber or foam insert."
I can not copy and paste the picture that accompanies these instructions but I think you get the idea, be careful.
 
#14 ·
Very few front drive V-type engines are any good to work on. Hondas used to have the intake entirely in the vee of the motor allowing total access to the rear. The packaging of the 3.6 into the JK is a bit of a nightmare.
 
#15 ·
$430 with parts to do this at my trusted dealer in WI. I have the lifetime warranty (not selling it back) but want to keep everything golden so I'll be doing the full coolant flush too. They want $175 for that. I am thinking I'll do the sparkplugs myself though.
 
#16 ·
$430 with parts to do this at my trusted dealer in WI. I have the lifetime warranty (not selling it back) but want to keep everything golden so I'll be doing the full coolant flush too. They want $175 for that. I am thinking I'll do the sparkplugs myself though.
That about cost here in Canada, it’s took me about 3 hours, if you do it yourself change plenum gaskets and while you have upper manifold off change the PCV valve.
It’s easer when everything is torn apart


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