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A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

‘00 Ford Explorer, Blown Out Spark Plug

Q: I recently had the number one spark plug on my 00 Ford Explorer blow out. The electrode blew right out of its socket. I had to tap out the remainder of the plug and I apparently did not get it all. When I restarted the engine it made one hell of a racket and would barely idle. I removed the cylinder head and found no damage to the valves but the piston has a piece of metal about 1/4 of an inch in diameter lodged in it and the cylinder head is pretty nicked up. The cylinder walls are not damaged. I can grind this metal off the top of this piston and do a valve job, lifters timing chain ect. Can I expect it to run properly? My concern is damage to the piston, rod and or bearing. Any advice would be greatly appreciated.

A: Id say that’s an $800 to $1000 question on a good day. A piece of wreckage hammered into the top of the piston can cause untold or is that unseen damage. My recommendation? Pull the motor and replace the damaged piston. Have the connecting rod checked, replace the bearings in that cylinder and be sure to have the head inspected for possible cracks. Your situation is why many shops will have nothing to do with a broken spark plugs of any kind. It’s hard for the customer to understand all the possible expenses that may or may not occur from what is often perceived as a simple task.

 
     
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