Question about Spark Plugs BR4HS Plug 10/BX #3322

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Spark plug thread broke off while trying to get it out!

Was trying to put new spark plugs in motor. When pulling out old spark plugs one of them was stuck and was very hard to unscrew! Put a little more effort into it and then it broke in half leaving the thread stuck in the cylinder head!

What can i do to fix this problem? any advise is welcome!

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I did this today, if you are lucky like i was, the core of the plug came out, just leaving the thredas screwed in.if this is the case, just get a stud extractor (the type you screw in bacwards)
that pulled mine straight out, with no issues.

Posted on May 18, 2009

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Their are three options;  A tap of the proper size may clean up the existing threads. The second , is a kit called a Heli-Coil where you remove all the threads , tap it out bigger and instal a Heli-coil to bring the threads back to the original size.  The third is to tap it to the biggers size and then look for an oversized plug. I was able to do this for a lawnmower many years ago and do not know if oversized plugs are still available. 

Posted on Feb 15, 2009

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Oct 14, 2014 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

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Aug 07, 2014 | Spark Plugs BR4HS Plug 10/BX #3322

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Hi I have a 1984 ford laser 5 door hatch. I purchased new spark plugs from auto cheap Hastings NZ. I gave licence plate number and description of car. Sales person looked up info on their computer and...

No I would say not . The only thing that may be at fault is if the reach (length 0f thread) of the bosh plugs was incorrect there is a remote chance that they hit the piston tops. The problems as you describe are like of a battery with a dead cell or loose and dirty terminals . When there is not enough power in the battery (low voltage) then the ignition system is starved and the coil and other bits will not work properly. Also if the drive belt is loose or the alternator is faulty then electrical system is down on power and the faults appear.

Aug 20, 2013 | Spark Plugs BR4HS Plug 10/BX #3322

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Oct 18, 2010 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

What is the difference between BR8HS and BR4HS spark plugs. Cheers Paul

The numbers 4 and 8 are heat ratings. The lower numbers run hotter. Different heat ratings allow you to choose the best compromise between keeping the plug from fouling and making the electrode last longer. If your plugs tend to foul, you need a hotter plug. If they tend to fry away, you need a cooler one. As engines get old, they tend to need hotter plugs. The differences in the heat ratings can be seen in subtle differences in the dimensions of the electrode (usually the center one) and the little insulator around the center electrode. The dimensional changes effect the heat transfer characteristics of the plugs, which changes how effectively the high temperatures present at the spark are conducted away. Besides the heat rating of the plug, the other big factor is having a nice clean thread surface in the engine block, which is why some mechanics will use a thread chaser when changing plugs. Here's a link to NGK's numbering meanings
I hope you found this helpful.

Aug 27, 2010 | Spark Plugs BR4HS Plug 10/BX #3322

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