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What would cause a spark plug to break off in a cylinder head

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  • Honda Master
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Rough treatment when installing or trying to extract the spark plug with a socket.

Posted on Aug 03, 2010

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Posted on Jan 02, 2017

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2 Answers

I have a 2006 saturn vue 6 cylinder and a plug is stuck. How do you get it out wiyhput breaking it off in the head#?


Don't worry about it breaking up. The base is all metal, not likely to break up. What is of concern is that the spark plug threads in the cylinder head don't get messed up when removing a stuck plug.
Use some liquid wrench or penetrant around the spark plug, and let it sit for about 20 minutes. Then put socket on the plug and wrench it out. Sometimes the upper part of plug, the ceramic top, will break off, but you can still remove the base part. Buy a tube of anti-seize compound, and use it on the threads of new plugs. You will never have a stuck plug again.

Jan 25, 2017 | Saturn Cars & Trucks

1 Answer

Hesitating on a 2006 Buick Lacrosse


this is for a 3.6L engine, should be the same either way. doesnt seem extremely difficult

  1. Turn the ignition OFF.
  2. Remove the ignition coil.
  3. Use compressed air in order to remove debris from the spark plug cavity.
CAUTION: Refer to Safety Glasses and Compressed Air Caution in Service Precautions .

NOTE: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.
  1. Remove the spark plug.
NOTE: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

INSTALLATION PROCEDURE
  1. Ensure that the spark plug gap is equivalent to the spark plug gap specification. Refer to Ignition System Specifications.
NOTE:
  • Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
  • Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.
  1. Install the spark plug.
NOTE: Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.

Tighten the spark plug to 20 N.m (15 lb ft) .
  1. Install the ignition coil.


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Aug 04, 2016 | 2006 Buick LaCrosse

1 Answer

I need to locate the number 4 spark plug wire to replace the spark plug can you tell me how to locate this wire on a 05 ford expedition


Your vehicle doesn't have spark plug wires . Has coil on plug ignition system . Eight individual coils sitting right on top of the spark plugs . An the spark plugs have the tendency to break in the cylinder head . Does your ford have the 5.4 L 3 valve engine . Your best bet is to take your vehicle to a qualified repair shop that has the tool to take the broken spark plug out off the cylinder head. Ford 4 6L 5 4L 3V Spark Plug Removal Watch this ford tech .

Jun 29, 2016 | Ford Cars & Trucks

1 Answer

How to change spark plugs



REMOVAL PROCEDURE
  1. Remove the ignition control modules.
  2. Clean the spark plug recess area with low pressure air.
CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.

NOTE: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.
117381099
  1. Remove the spark plugs from the cylinder heads.
NOTE: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.
  1. Inspect the spark plugs. Refer to Spark Plug Inspection.
INSTALLATION PROCEDURE
  1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications.
NOTE:
  • Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
  • Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.
117381099
  1. Install the spark plugs to the cylinder heads.
NOTE:
  • Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.
  • Refer to Component Fastener Tightening Notice in Service Precautions.
Tighten the spark plugs to 20 N.m (15 lb ft) .
  1. Install the ignition control modules.

Jul 14, 2014 | 2006 Cadillac SRX

1 Answer

How to change spark plugs on 2001 chevy lumina


First, I would highly recommend that you also purchase a set of igniton cables and replace these also because you are most likely to have damaged spark plug boots when you remove the boots from the plugs. Trust me...it happens about 95% of the time, and you will be way ahead of the frustration if you are prepaired.

Pull the spark plug boots off of the spark plugs.

NOTE:

Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

Clean the spark plug recess area before removing the spark plug. (spray brake cleaner and compressed air works well) Failure to do so could result in severe engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.

Screw the spark plugs out of the cylinder head.
Check the air gap at the electrode end of the spark plug.

The specification for the plug gap on your vehicle is 1.524mm (0.060 in)

Place a SMALL amount of nickle-based antiseize compound on the spark plug thread, being very careful not to get any on the porcelain portin of the plug. If you do get antiseize on the porcelain part of the plug, it is imperative that you clean it off thouroughly using brake cleaner and a clean rag, otherwise it could cause cylinder misfires.

Screw the spark plug into the cylinder head and torque to specifications.
The spark plug torque specification for your vehicle is 15 Nm (11 ft. lbs.)

NOTE: Failure to properly torque the plugs can cause severe engine damage. Overtightening the plug can damage the threads in the cylinder head and/or make spark plug removal in the future impossible. This will cause you to have to remove the cylinder head for repair the next time the vehicle needs service on the spark plugs.
Undertightening can cause the plug to leak compression and damage the threads in the cylinder head. This can result in the plug blowing completely out of the head causing severe cylinder head damage.

When replacing the ignition cables, make sure they are routed EXACTLY as they were originally routed from the factory. Make sure that all protective wire loom and fasteners are transfered to the new wires and secured properly. Failure to do so can cause damage to the cables, engine misfires and can cause the spark plug wires to "spike" sensitive sensor circuits that are nearby and cause damage to the sensors or your computer modules. Improperly routed ignition cables have also been known to cause interference in radio and stereo systems.

HINT: The rear plugs on your engine are much easier to get to if you remove the two engine struts that go between the engine and the upper radiator support. You can then use a ratchet strap to pull the engine forward to get more room to work on the rear plugs.

Aug 12, 2011 | 2001 Chevrolet Lumina

2 Answers

Where are the spark plugs located on the car


They are underneath the coils,there will be a coil,and under the coil will be a spark plug boot connecting the coil to the spark plug.

Oct 30, 2009 | 2001 Oldsmobile Intrigue

1 Answer

Where are the spark plugs on my 2000 Oldsmobile Intrigue and how do i change them?


2000 Oldsmobile Intrigue V6-214 3.5L VIN H SFI

Spark Plug: Service and Repair
REMOVAL PROCEDURE
TOOLS REQUIRED
J 43094 Spark Plug Boot Puller
1. Turn OFF the ignition switch.
2. Remove the ignition coil assembly.
3. Use the J 43094 in order to remove the spark plug boots from the spark plugs.
NOTE: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug
threads to seize causing damage to cylinder head threads.
NOTE: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or
foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the
proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.
4. Remove the spark plugs from the engine.
INSTALLATION PROCEDURE
NOTE: Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the
vehicle. Installing spark plugs of another type can severely damage the engine.
NOTE: Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round
feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the
engine.
1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications. Refer to Spark Plug Usage.
Correct as necessary.
NOTE: Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary,
to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or
thread damage.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the spark plugs to the engine.
Tighten
Tighten the spark plug to 20 N.m (15 lb ft).
3. Install the spark plug boots to the ignition coil assembly.

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4. Install the ignition coil assembly.

Sep 13, 2009 | 2000 Oldsmobile Intrigue

2 Answers

No spark to one cylinder


check the spark cable or the cylinder coil

Jun 07, 2009 | Hyundai Motor 1996 Elantra

3 Answers

Spark plug gap


Notice: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.
Gap the spark plug, using round wire type spark plug gap gage. 


Gap Adjust the spark plug gap to 1.14 mm (0.045 in).

DO NOT coat the spark plugs with anti seize compound. Over torquing could occur and damage to the cylinder head threads may result.

If your going to use Platnum plugs, DO NOT GAP them. Just check the gap and if there not the right gap, ask for new one's with the right gap.

The metal on the PLatnum plugs, are harder and my break apart in the cylinder .

Good luck and hope this helps

May 02, 2009 | Pontiac Sunfire Cars & Trucks

1 Answer

2004 Toyota Tundra spark plug


The causes for spark plugs leaving the cylinder head are as follows:
1. The threads in the cylinder head were compromised, as in cross-threading.
2. The spark plug, when replaced, was not tightened down properly (like only 2-3 threads in)
3. A combination of the above.

Whe the plugs are fully seated in the cyl heads, and are at the proper torque, it would be extremely RARE for the plug to be jettisoned by the compression of the pistons. You only have roughly 175-185 PSI compression, this will NOT defeat the retention of the threads. Look at the hole in the head...How may threads are damaged? If it is just the end of the hole, the plugs was not in "all of the way". If ALL of the threads are bad, the plug was inserted improperly, and damaged the threads in the head. Rethreading (a "heli-coil") will correct you condition, if properly done.
Hope this helps.

Sep 30, 2008 | 2003 Toyota Tundra

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