View Full Version : Spark Plugs
williamsd123
05-06-2010, 11:14 PM
How do u change the spark plugs in a 300a?
hotford
05-07-2010, 01:50 AM
Well if have to ask I suggest you contact a local automotive repair facilty.
But if ya want to know you have to remove the coil covers which are located on the valve covers first, then remove the coil on plug, Just twist and pull they should easily come out, then use a 5/8 socket with at least a 6 inch extension with a rachet and turn counterclock wise, It will take a little force to release them, you can install the news ones (check the gap first) place a little anti sieze compound on the thread be carefull not to get any on the electrode or the pourcilin which is located in the middle of the plug...lol,
Next torque to 18-22 inch pounds if ya have a torque wrench.
Sounds like a big deal but not all that bad.
gap will depend on application if its blowen or N/A..52 for a stocker and .28 -.32 if your blowen and depending on how much BOOST.
I hope this helps.
musclemerc
05-07-2010, 04:21 AM
If you have to ask then it's not a job for you to consider doing yourself. No offense but go to a shop.
fastblackmerc
05-07-2010, 04:51 AM
What they said^^^^^^^^^^
FordNut
05-07-2010, 05:23 AM
Well if have to ask I suggest you contact a local automotive repair facilty.
But if ya want to know you have to remove the coil covers which are located on the valve covers first, then remove the coil on plug, Just twist and pull they should easily come out, then use a 5/8 socket with at least a 6 inch extension with a rachet and turn counterclock wise, It will take a little force to release them, you can install the news ones (check the gap first) place a little anti sieze compound on the thread be carefull not to get any on the electrode or the pourcilin which is located in the middle of the plug...lol,
Next torque to 18-22 inch pounds if ya have a torque wrench.
Sounds like a big deal but not all that bad.
gap will depend on application if its blowen or N/A..52 for a stocker and .28 -.32 if your blowen and depending on how much BOOST.
I hope this helps.
Torque to approximately 10 ft-lb, not 18-22 in-lb.
Gap is .052 (you forgot a zero), that 1/2" gap is a bit large.
I agree with that first sentence.
Egon Spengler
05-07-2010, 05:52 AM
Try to use a socket made for changing out spark plugs. There is a piece of rubber in the socket that holds on to the spark plug for ease of pulling out and putting back in (freebie)...
With the spark plug socket wrench, once you have tightened the new plug don't just pull out the extension or you will leave the socket behind in the valve cover. You need to move the extension back and forth with a slight upwards pressure until to socket frees itself from the plug.
If you are even a little bit mechanically inclined, this process should talk half an hour or less.
Make sure the engine is cold. Do not over torque, 10-12 ft lbs. Gap .052 inches
and a little anti seize on the threads.
http://www.mercurymarauder.net/gallery/data/21/DSC03685.JPG
The beer and ribs are not optional.
Paul T. Casey
05-07-2010, 06:05 AM
Make sure the engine is cold. Do not over torque, 10-12 ft lbs. Gap .052 inches
and a little anti seize on the threads.
http://www.mercurymarauder.net/gallery/data/21/DSC03685.JPG
The beer and ribs are not optional.
Post of the year contender.
Paul T. Casey
05-07-2010, 06:07 AM
that 1/2" gap is a bit large.
What do you figure for coil voltage to make that jump? A lightning strike?
Egon Spengler
05-07-2010, 06:11 AM
Post of the year contender.
The only problem is that there is a Coors light in the picture and not a Coors Original... which is a great beer! Puts hair on the old juevos
fastblackmerc
05-07-2010, 06:12 AM
Blow or suck out any debris that might be in the plug wells. Just changed mine and used the shop vac before removing the plugs and after removing the plugs. You don't want any debris entering the combustion chamber.
Egon Spengler
05-07-2010, 06:14 AM
Blow or suck out any debris that might be in the plug wells. Just changed mine and used the shop vac before removing the plugs and after removing the plugs. You don't want any debris entering the combustion chamber.
Good safety tip... Those caves are terrible at gathering s*** in them when you remove the covers.
RF Overlord
05-07-2010, 08:05 AM
Next torque to 18-22 inch pounds if ya have a torque wrench.The factory service manual calls for 11 ft-lbs, which is 132 inch-pounds.
Also, it's HIGHLY recommended to use a torque wrench. It's very easy to damage aluminium heads by over-tightening.
place a little anti sieze compound on the threadIf you do that, then reduce the torque setting by 20% as anti-seize acts as a lubricant and makes it even easier to over-tighten.
bawazir
05-07-2010, 08:11 AM
Make sure the car is cold when changing it,
fastblackmerc
05-07-2010, 08:22 AM
Make sure the car is cold when changing it,
See post# 7 Zippy.......:shake::shake:
hotford
05-08-2010, 02:25 AM
Torque to approximately 10 ft-lb, not 18-22 in-lb.
Gap is .052 (you forgot a zero), that 1/2" gap is a bit large.
I agree with that first sentence.
Thanks for the correction..lol
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