(1 Viewer) Thread starter NerdNoise; Start date Oct 12, 2012; Watchers 4 NerdNoise. Thread starter #1 So the thread stripped out a while ago and I had a helicoil placed to fix it. But in your situation it was most likely fatigued aluminum threads from being over tq'ed during replacement of plugs and or not using an anti seize. Help? I put a new one in and it drove fine for day. Spark plug blew out - helicoil? It blew out the No. Thanks in Advance On Ford vehicles spark plug repairs use p/n 5553. 5 spark plug. Blow out is a major issue on some vehicles. Joined Apr 26, 2009 Messages 188 Location Salt Lake City, UT. Ford 4.6, 5.4 and 6.8 modular engines are prone to spark plugs being blown out of the cylinders due to the aluminum threads failing. It seemed to be fixed ok at Sarasota Ford in December, but the SAME ONE just blew out again. So yesterday the plug in the middle on the driver side (#4?) I'm hosed, right? … My grandpa was a mechanic and asked me if I could put a oversized spark plug, what would work best. Question: I have a 1999 Ford F150 with a 4.6 liter Triton engine with 126,000 miles on it. In 200,000 miles each spark plug has resisted that 300 pound force maybe 225 million times. Its recommended when doing any spark plug job to blow out the spark plug holes before removing any plugs so debris does not blow the plug out. That plug has been in there 2+ years. driving along today i had a loud pop then a shudder i pull over a checked the engine to find the spark plug had come out of the #1 cylinder with a helicoil on the spark plug so being the genius i am i tried to put another helicoil in and the whole thing dropped into the cylinder i got i back out by the grace of god. Today it blew out again and the threads won't catch on a new one. Oct 12, 2012. The common fix is to helicoil the spark plug hole with one of a few different tool sets on the market. 3vze spark plug Heli-coil blew out. RockAuto: Rockauto: 0: 01-12-2017 02:52 PM: Spark plug blew off head and damaged ignition coil. If the spark plugs are not tight enough the spark plug vibrates until the aluminum is weakened to a point the spark plug shoots out. Fortunately, a couple of fixes are available to the experienced home mechanic. awthorn: 3rd gen T4Rs: 33: 03-06-2020 10:39 AM: Spark Plug (Coil-On-Plug) Boots at RockAuto.com! blew out. The number 3 spark plug blew out of the cylinder head. Within 1,000 miles of driving, it blew out both the plug and the Heli-Coil. The Helicoil insert O.D measures .660 inches. The Helicoil spark plug insert is black in color and has a knurl at the top to keep it in place by hitting the top of the insert with a mandrel and a hammer. Below are a few of the questions we have answered related to spark plug blow outs in Ford and Lincoln vehicles. see below pictures. Finally, there's that sickening feeling when you're changing plugs and inadvertently cross-thread a plug while installing it. Conversely, plugs may gradually loosen over time and eventually be blown out of the head by cylinder compression, mauling the threads. The plug experiences a force of about 300 pounds trying to push it out of the cylinder head on each power stroke. See our mechanics FAQ tool blog for even more questions answered on this topic. I took the car to a Chevy dealer, who put in a Heli-Coil as a repair. Hey Dennis I have a 1999 F250 with a 5.4 triton and it had a heli-coil that blew out with the spark plug, so I took it to a dealership and they said I would have to get a new engine. The thread on the spark plugs is M14 so the threaded portion of the plug has a cross-sectional area of about 0.239 square inches. 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