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Unread 04-03-2013, 10:42 AM   #31
SimmZ
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Well... If you don't use a torque wrench to control actual pressure, how do you tight the spark plug? Just as you feel it (approximately)?

In fact I think using a torque wrench is not a big deal if it can prevent any over or under tight issues... no?

I must say I always use the torque wrench in most circumstance... like when I replace intake manifold gasket last month on my Toyota... it's sure than the bolt pressures is not a big concern in this specific situation, but the torque specs was in the service manual, so why don't use it? ;-)

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Unread 04-03-2013, 11:48 AM   #32
FujativeOCR
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I just did this a few days ago. Use the NGK V Power. I bought the Mopar ones from the dealer and they are the NGK V Power.

They also gave me a print out of the service manual which also specified 20 Ft Lb of torque.

Dont get the Platinum ones. They are only higher performance if you're ignition system is designed to work with them...which it isn't.
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Unread 04-03-2013, 12:39 PM   #33
SimmZ
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Thank you for the information. Anyway I'm having a visit to the dealership tomorrow morning so they will re-re-re-confirm the 20 lb-ft torque theory! LOL

I'm gonna stick to the V-Power so. They are 6.99$ (for a box of 2) at Canadian Tire... the only problem is that they ran out of stock when I went to the nearest store this morning. However there is another Canadian Tire store not too far away and have them in stock.
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Unread 04-04-2013, 06:44 AM   #34
Gramps
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Quote:
Originally Posted by Gramps View Post
In over 50 years of working on cars I've never seen anybody use a torque wrench on spark plugs but here's the spec.

1. To avoid cross threading, start the spark plug into the cylinder head by hand.
2. Tighten spark plugs to 17.5 ±2 N·m (13 ±2 ft. lbs.).
These specs are right out of the service manual so do what ever you FEEL like...

Spark plugs have a compression washer on them and give you some flexibility and a 'feel' for when they are tight enough.
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Unread 04-04-2013, 07:28 AM   #35
FujativeOCR
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Quote:
Originally Posted by Gramps

These specs are right out of the service manual so do what ever you FEEL like...

Spark plugs have a compression washer on them and give you some flexibility and a 'feel' for when they are tight enough.
Then where did the 20 ft lb come from?
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Unread 04-06-2013, 06:46 AM   #36
Gramps
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Ask those that told you, not me! I can't stand behind information that others have given you. Other than Spark plugs having a collapsible compression washer that can vary in strength I haven't a clue. It's your Jeep, be as anal as you want but
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Unread 04-06-2013, 10:40 PM   #37
FujativeOCR
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They didnt tell me they showed me. Via printout supposedly from the service manual. So which is it?
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Unread 04-07-2013, 06:28 AM   #38
Gramps
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Mine is from the '07 FSM. If they changed the specs that isn't in my control.
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Unread 05-18-2013, 04:38 PM   #39
JGCGEORGE
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Personally I am a fan of iridium plugs. I have only had one problem with platinum plugs. I put Champion platinums in my 07 Grand cherokee (wk) 5.7 hemi and they caused it to randomly stall. Found this was the cause since eventually Chrysler was contacted and the engineers spoken too. One of the times I was pulling 6k on a flat bed trailer down hill on the highway, it stalled and then since the key was on and the converter locked, started itself again with a bang and I nearly lost control. So, if you have a hemi don't use platinum plugs, lol.
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Unread 11-12-2013, 12:46 PM   #40
firehazard51
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Quote:
Originally Posted by Gramps View Post
These specs are right out of the service manual so do what ever you FEEL like...

Spark plugs have a compression washer on them and give you some flexibility and a 'feel' for when they are tight enough.
I just went off the instruction box for my Champion spark plugs. Called for a half turn since it had a compression washer. Ended up with a very snug feeling that I wouldn't want to put any more torque on.
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