Help? 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. 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. Conversely, plugs may gradually loosen over time and eventually be blown out of the head by cylinder compression, mauling the threads. It blew out the No. In 200,000 miles each spark plug has resisted that 300 pound force maybe 225 million times. The number 3 spark plug blew out of the cylinder head. I'm hosed, right? blew out. 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. 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. 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. My grandpa was a mechanic and asked me if I could put a oversized spark plug, what would work best. So yesterday the plug in the middle on the driver side (#4?) 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. (1 Viewer) Thread starter NerdNoise; Start date Oct 12, 2012; Watchers 4 NerdNoise. … I took the car to a Chevy dealer, who put in a Heli-Coil as a repair. Blow out is a major issue on some vehicles. Thanks in Advance 3vze spark plug Heli-coil blew out. The Helicoil insert O.D measures .660 inches. Oct 12, 2012. On Ford vehicles spark plug repairs use p/n 5553. The plug experiences a force of about 300 pounds trying to push it out of the cylinder head on each power stroke. Blew a spark plug out of the block! It seemed to be fixed ok at Sarasota Ford in December, but the SAME ONE just blew out again. Below are a few of the questions we have answered related to spark plug blow outs in Ford and Lincoln vehicles. Fortunately, a couple of fixes are available to the experienced home mechanic. Today it blew out again and the threads won't catch on a new one. 5 spark plug. See our mechanics FAQ tool blog for even more questions answered on this topic. Within 1,000 miles of driving, it blew out both the plug and the Heli-Coil. 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. Spark plug blew out - helicoil? 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. Joined Apr 26, 2009 Messages 188 Location Salt Lake City, UT. I put a new one in and it drove fine for day. RockAuto: Rockauto: 0: 01-12-2017 02:52 PM: Spark plug blew off head and damaged ignition coil. Finally, there's that sickening feeling when you're changing plugs and inadvertently cross-thread a plug while installing it. awthorn: 3rd gen T4Rs: 33: 03-06-2020 10:39 AM: Spark Plug (Coil-On-Plug) Boots at RockAuto.com! The common fix is to helicoil the spark plug hole with one of a few different tool sets on the market. Thread starter #1 So the thread stripped out a while ago and I had a helicoil placed to fix it. Question: I have a 1999 Ford F150 with a 4.6 liter Triton engine with 126,000 miles on it. see below pictures. That plug has been in there 2+ years. 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