Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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The silicon in that spot is from the factory. It is sealing the back cover/block/HPOP cover. You are supposed to run a razor knife around the HPOP cover in that area before you take the HPOP cover off so that you don't hose up the seal between the back cover and the block. If the back cover seal gets messed up the only way to reseal it is to pull the engine (or so I have been told). Hopefull you didn't disturnb the back cover seal. When reassembling, be sure to put a dab of RTV in the same spots when you put the cover back on, otherwise you will have a leak forever...
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter