spark plugs torque specs??? - Toyota Nation Forum : Toyota Car and Truck Forums
Archived Corolla threads Older Archived Corolla threads

 
LinkBack Thread Tools Display Modes
post #1 of 9 Old 10-21-2006, 01:03 PM Thread Starter
Official TN Member
 
Join Date: Jun 2005
Location: USA
Posts: 680
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
(Thread Starter)
spark plugs torque specs???

greetings, i was in the process of changing my spark plugs and noticed the manual says 150 inch-lbs. I was confused, is there another torque wrench to use? I currently have a torque wrench that says "foot-lbs". Should I go buy a torque wrench thats labeled "inch-lbs"??? I know for sure that I should not torque these spark plugs with the same torque wrench as the one i use for my lug nuts since 80 ft-lbs on my lug nuts are freakin tight already!!! thanks for the help!
rice is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 10-21-2006, 02:02 PM
Official TN Member
 
Join Date: Sep 2003
Location: st.joe
Posts: 341
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Just wrist tight buddy. Do not overtighten, these are threads you absolutely don't want to strip. If you wanna be technical and use a torque wrench, then 150" lbs. = 12.5' lbs. Again, that's 12.5 foot pounds.
OEMonkey is offline  
post #3 of 9 Old 10-21-2006, 02:24 PM
TN Post Wh*re
 
Bitter's Avatar
 
Join Date: Sep 2006
Location: Near Chicago
Posts: 10,460
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 861 Post(s)
Thanks: 5
Thanked 739 Times in 695 Posts
iTrader Score: 0 reviews
finger tight, then 1/4 turn is how i do new plugs. that crushes the steel washer into place well, however i do this with a COLD engine. on a warm/hot engine i use finger tight and 1/8th turn then i'll recheck them later and snug them down a little more if needed. reason being, hot aluminum is ALOT softer than cold aluminum.
Bitter is online now  
post #4 of 9 Old 10-21-2006, 04:27 PM
Vroom?
 
freakinbox's Avatar
 
Join Date: Oct 2005
Location: Canada
Posts: 4,408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 7 Times in 7 Posts
iTrader Score: 0 reviews
yea I also do it by hand, shop I worked at it did it that way too. Just do not over tighten, aluminum isn't that hard to mess up :p


2006 Ford Ranger
1989 Corolla sr5, 4af, 1990 gts seats, TRD short shifter.
http://www.cardomain.com/ride/2061750
freakinbox is offline  
post #5 of 9 Old 10-21-2006, 07:58 PM Thread Starter
Official TN Member
 
Join Date: Jun 2005
Location: USA
Posts: 680
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
(Thread Starter)
yeah thanks guys for confirming, I also noticed that it was only nug tight and not real tight
rice is offline  
post #6 of 9 Old 10-21-2006, 08:18 PM
New Corolla XRS user
 
REN69's Avatar
 
Join Date: Aug 2002
Location: Clarington/T.Dot
Posts: 18,966
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 48 Post(s)
Thanks: 8
Thanked 123 Times in 106 Posts
Lifetime Supreme Member
Garage
iTrader Score: 5 reviews
As long as they're tight enough that you can't losen them up by hand, you should be ok. I usually tighten them a couple of turns and that's it.



Follow my Supra Antics on Facebook ---> HERE!
REN69 is offline  
post #7 of 9 Old 10-21-2006, 08:57 PM
Vroom?
 
freakinbox's Avatar
 
Join Date: Oct 2005
Location: Canada
Posts: 4,408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 7 Times in 7 Posts
iTrader Score: 0 reviews
I thread them by hand with the extention, rather than with the socket wrench so I don't corss thread it


2006 Ford Ranger
1989 Corolla sr5, 4af, 1990 gts seats, TRD short shifter.
http://www.cardomain.com/ride/2061750
freakinbox is offline  
post #8 of 9 Old 10-23-2006, 02:33 PM
4AFESPEED
 
TheOtherCarolla's Avatar
 
Join Date: Aug 2006
Location: Franklin, NC
Posts: 269
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
Aluminum heads max 22 ft lbs. I use a ratchet stright up and down with my one hand, spin the ratchet with my other hand with one finger until i can't spin it anymore and it always works fine.

Dont be a jackass and tighten it to all hell and make it hard for someone else to get out later

93 Prizm - Friend wrecked it R.I.P. 10-19-07
95 Corolla - Best DD ever
96 Corolla - new beater, project.. racecar?
TheOtherCarolla is offline  
post #9 of 9 Old 11-14-2015, 05:33 PM
New TN User
 
Join Date: Sep 2015
Posts: 17
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 8 Times in 5 Posts
iTrader Score: 0 reviews
Best to use a torque wrench

When changing the spark plugs in our 2007 Corolla (original plugs, never been removed, 131 k miles, Mobil 1 all its life), the first few turns backing out were moderately high torque and then the rest was easy by hand with only socket and extension attached. The plugs were in excellent shape with white, dry insulators and only minor metal transfer at the electrodes (could have gone many more miles). There was only a small amount of oil on the threads of two of them, and a tiny amount of oil on one or two of the coil inserts indicating I need to change the VC gasket soon.
The plugs were replaced with same as original Toyota branded Denso SK16R11. The spec value of torque in the Toyota shop manual is 18 ft-lb (216 in-lb, 25 N-m). The plugs went in easily, finger tight, and came up hard as if seating the compression seal washers. I CAUTION anyone who tightens 1/4 turn or less after this or torques plugs on a hot engine that they are likely not seating the plug properly or may damage the head threads. Finger tight is not reliable for determining seal contact. Depending on the condition of the crush washer, the tightening process may take more than a turn. And only a properly calibrated, properly used torque wrench will tell you when you have seated the plug correctly, especially if others have messed with your spark plugs before or if you have carbon or other deposit problems. The plug spec for my 1ZZ-FE engine states 18 ft-lb. The 2ZZ-GE engine is much lower (about 12.5 ft-lb).


With a NEW PLUG (Denso SK16R11) on the 1ZZ-FE engine, after finger tight, the torque will climb to around 12 ft-lb as the washer begins to crush. This initial rise may take about a 1/4 turn. Then the torque will stay at about this value as the washer is being crushed. This crush process may take as much as a full turn. Then the torque rises quickly as the seal is finally seated. This final seating may take another 1/4 turn.


With a USED PLUG, the washer is already crushed and the torque rise to spec value may take only around a 1/4 turn total.

Suggestions for proper plug torque.
1. Use a smaller torque wrench (Not the same one you use for your lug nuts!), preferably a beam type that has a max setting of 600 in-lb, or even 250 in-lb. That way it is user calibrated and accurate in the range needed for plugs. Trying to use a 250 ft-lb click type (breakover) torque wrench is just asking for trouble and will probably result in over-torqueing.
2. Follow the suggestions that others have made to only use fingers, an extension and a plug socket (with the foam insert) to remove and start rethreading plugs. That way you are less likely to drop the plug and mess up the gap or insulator, and you can "feel" the condition of the threads to avoid cross threading.
3, In technical terms, Use Pure Couples when using a torque wrench (or any socket wrench in general). A Couple is the application of two forces in opposite directions to provide pure torque. This prevents putting a bending moment on the plug, bolt or nut which can bias the applied torque and damage the plug, bolt or nut. To apply a pure couple to the torque wrench, hold the wrench head with one hand and the handle with the other. Whatever force you apply at the handle, try to apply the same force in the opposite direction at the head. This is just common sense if you think about it.
4. Use a new plug if you can. If this is not practical, it is especially important to properly use a torque wrench and have a clean seal, seat and threads. This is because a used plug's crush washer is already crushed and, as was already pointed out, the factory thread lube is gone or not as effective. And remember, a dropped plug belongs in the garbage, never in your engine.
5. If you choose to use an anti-seize compound on the threads, I would suggest reducing the spec torque by 20%. Anything you put on the treads may get on the electrodes or insulator, especially if you use too much or put it near the end of the plug.
drocketman is offline  
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Corolla and Matrix Forum > Archived Corolla threads

Bookmarks
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Toyota Nation Forum : Toyota Car and Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome