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Unread 03-21-2010, 11:55 AM   #1
Xride
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What do I torque my Spark plugs to? 99 4.0l?

I can't seem to find the spec on how much to torque my plugs?
I have a 99 4.0.

Any help?


Thanks.

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Unread 03-21-2010, 11:57 AM   #2
Jameslol
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Wait you torque spark plugs? lol

I just tighten them down until they are snug, if you have a haynes manual it should tell you, if no one gives you a reply ill dig mine up and look for you.
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Unread 03-21-2010, 12:01 PM   #3
Xride
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I dunno, can I just tighten them down? lol I figured they were something I should spec.
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Unread 03-21-2010, 12:10 PM   #4
93gc40
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You DON'T torque plug. You tighten them until the washer compresses.
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Unread 03-21-2010, 12:14 PM   #5
Xride
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Quote:
Originally Posted by 93gc40 View Post
You DON'T torque plug. You tighten them until the washer compresses.
EVERYTHING has a torque spec.

How do I tell if the wash has compressed? How much is too much torque? With just the 1/2" ratchet its not hard to get over 100ft lbs of torque. This would be more important with an aluminum head.

The 99 has a cast iron head though right?
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Unread 03-21-2010, 12:22 PM   #6
CJ7-Tim
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Quote:
Originally Posted by Xride View Post
EVERYTHING has a torque spec.
True.

Spark plugs are torqued to 30ft/lbs (which is tighten until you get a light resistance (snug) and then turn the wrench handle 1/8 more of a turn).

A dab a of anti-seize compound is also a good idea.
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Unread 03-21-2010, 12:24 PM   #7
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Quote:
Originally Posted by CJ7-Tim View Post
30ft/lbs (which is tighten until you get a light resistance (snug) and then turn the wrench handle 1/8 more of a turn).

A dab a of anti-seize compound is also a good idea.
Did my spark plugs yesterday at 30 ft/lbs and a dab f anti-seize. so +1 on what Tim said.

btw Haynes manual doesn't give you a spec in the description. I can't find a page with any torque specs really.
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Unread 03-21-2010, 12:37 PM   #8
Xride
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Quote:
Originally Posted by CJ7-Tim View Post
True.

Spark plugs are torqued to 30ft/lbs (which is tighten until you get a light resistance (snug) and then turn the wrench handle 1/8 more of a turn).

A dab a of anti-seize compound is also a good idea.

Thank you

I have a tq wrench so I will get them all to spec.

Thanks again.
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Unread 03-21-2010, 01:35 PM   #9
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As long as they're not too loose so they don't eject when you're driving, you'll be all set!
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Unread 03-21-2010, 01:45 PM   #10
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Some plugs have washers, some don't. Doesn't the package the new plugs came in refer to the proper way to tighten them???????
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Unread 03-21-2010, 02:28 PM   #11
grovesb2
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Quote:
Originally Posted by djb383 View Post
Some plugs have washers, some don't. Doesn't the package the new plugs came in refer to the proper way to tighten them???????
I have the Champion box in my hand from yesterday. It states:

Quote:
With Gasket: Tighten 1/2 turn. Without gasket: Tighten 1/16 turn.
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Unread 03-21-2010, 03:02 PM   #12
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FSM for 01 says

Tighten the spark plugs to 35-41 Nm (26-30 ft.
lbs.) torque.


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Unread 03-21-2010, 03:04 PM   #13
Xride
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Quote:
Originally Posted by Wearingthin View Post
FSM for 01 says

Tighten the spark plugs to 35-41 Nm (26-30 ft.
lbs.) torque.


Alum head though.



Is this what my old plugs should look like? They all looked more or less the same.
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Unread 03-21-2010, 05:08 PM   #14
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All Cherokees have cast iron heads.
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Unread 03-21-2010, 06:19 PM   #15
tjwalker
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How many miles were on those plugs? What was the gap? Looks like they were ready to come out.....I go 30k on my plugs.
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