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Re: Hi - I was driving the pickup and a sparkplug just
Most likely the cause of this problem was replacing spark plugs with engine hot. A tap and die may work, make sure you get the correct size. Do not over tighten. You can enlarge the whole using a tap and die and use a larger spark plug. DO NOT ALLOW METAL SHAVING TO FALL INTO CYLINDER WALLS. Start engine with plug out to blow any missed shaving out of cylinder. If this does not work a helicoil will be the next option.
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there is helicoil reseating kit that has the correct tap and helicoils for plugs ( make sure you get the kit for spark plugs)
the insert thread is stainless steel and brings the thread back to standard
stripping threads is a result of incorrect reach plugs in use as the carbon build up exposed threads causes the stripping problem
use plenty of grease on the taping process to reduce the filings falling into the cylinder
If you are lucky, the spark plug was not tightened correctly and worked loose. In this case, you may be able to chase the threads and it will go back in and stay. Make sure the plug is installed correctly this time.
If you are unlucky, the threads will be stripped. In this case, you have 2 choices: thread repair or larger spark plug. Either way, you have to drill and tap the spark plug hole without getting any metal shavings in the cylinder. The main difference is that if you use a thread repair insert, the original spark plug size will fit in your engine; if you tap out the holewithout using an insert you will have to get a different spark plug for the cylinder that was repaired.
It sounds like the area near the #4 spark plug is getting hotter than normal. Maybe an intake valve is not closing the whole way, thus letting the heat come out of the cylinder. I would get a cheap laser thermal dectector and measure the heat there compared to the other spark plug areas.
THere are really only 2 ways to fix this, and you must be mechnically inclined to do it. You have stripped the thread in the head so you either have to 1) replace the whole head assembly or 2) get the spark plug hole tapped and rethreadded.
Those are as easy as they come these days.
Mark each spark plug wire with a piece of tape with the cylinder # written on it, so as not to mix up the wires.
Remove each spark plug wire by firmly grasping the wire by the boot (do not pull on the wire) and twist it back and forth a few times while pulling slowly. It should pop off without a great deal of effort. If it is seized and it breaks, you will have to replace the wire, or at the very least replace the terminals (if you can get some).
Use an air hose and blow around the base of each spark plug to dislodge any loose dirt that could fall into the cylinders (not absolutely necessary, but a good idea).
Remove each spark plug with a spark plug socket and extension and ratchet (I forget which size socket, it's either 5/8 or 13/16).
Check the gaps of each new spark plug (typically around 0.035 in).
re-install each new spark plug by hand (do not cross-thread them) and once you have ensured that the plug is threaded in properly, tighten the plug until it seats, and then tighten an additional 1/16 of a turn. Repeat this for the remaining plugs.
Re-install wires to the corresponding spark plugs.
In my estimation,the only fix is to have a mechanic take the head off and weld a plug in the hole, then drill and tap the hole for a new plug. If you do not want to do this then retap the hole slightly larger with good threads, then select the correct helicoil to use in the hole and put in the plug. That should last the life of the car and allow removal of the plug. See: http://www.helicoil.in/pdf/HeliCoil%20Catalogue.pdf
the problem with glue type metal cements is they nwill not take the internal pressure of the firing of the chamber.
I am writing you the method on how to change sparkplugs, you may now have an idea where spark plug is loacted.
The Ford Expedition uses eight spark plugs to accommodateits eight-cylinder engine. Replacing the spark plugs every 75,000 miles is animportant part of overall vehicle maintenance.
1. Disconnectthe negative (black) battery cable from the battery terminal.
Remove thewiring harnesses from the spark plug coils. There will be four on each side ofthe engine block, which you can remove by simply pulling them out of the sparkplug coils.
2. Unscrew the 7mm bolt from each of the spark plug coils usinga socket wrench and 7mm socket.
3. Pull each spark plug coil out of the engine block. Pull themout slowly, being careful not to damage or tear the coils.
4. Use a socket wrench and spark plug socket to unscrew eachspark plug from the engine block. Once you remove these, discard them.
5. Place the new spark plugs into the engine block and tightenthem using the socket wrench and spark plug socket.
6. Slide the spark plug coils back into the engine block.
7. Bolt the spark plug coils back into place using a socketwrench and 7mm socket.
8. Reattachthe wiring harnesses to the spark plug coils.
9 . Connect the negative battery cable to the negative batteryterminal.
Hi, to change spark plug first remove coil over connecting clip ensuring to depress connector release. Next remove coil over retaining bolts. Remove coil over carefully directing coil toward driver side until rubber end able to flex out of sparkplug access tube. Remove sparkplug using sparkplug socket with rubber insert. Had to remove ratchet to gain enough clearance. At this point you should be able to remove sparkplug by tilting extension & socket toward drivers side of car. Then lay horizontal & remove toward passenger side of car. If unable to gain access in this manner you probably have too long an extension. Take care as not to damage spark plug coil over as they are considerably expensive.