BMW S65 & S85 Crank Girdle Sealing: The Right Way to Inject RTV

BMW S65 and S85 crank girdle sealing is one of those details that can make or break an engine build, whether you admit it or not. In this video, Peter Partee and the team at Partee Racing break down how BMW originally sealed the S65 and S85 crank girdle, why old sealant is no longer a reliable option, why simply smearing RTV is not the right precision solution, and how our in-house tool injects RTV through the factory passage the right way. If you build S65, S85, S55 and other engines and care about leak prevention, precision, and doing the job correctly, this video is for you. In this video: • The original BMW crank girdle sealing method • Why old sealant can fail to cure • Why conventional RTV application is not ideal • How our RTV injection tool works • How to load, use, and clean the tool • What to look for during final assembly Learn more at ParteeRacing.com 00:00 Intro 00:13 The S65/S85 crank girdle problem 00:38 How BMW originally sealed it 02:33 Why the old sealant is no longer the answer 04:12 BMW’s current RTV recommendation 04:38 Why smear-on RTV is not precise enough 05:46 Why standard tools fail 06:42 Designing a better solution 07:29 Tapping the block for the tool 08:59 Why we built this tool 09:54 How to fill the tool without bubbles 10:49 How the tool creates pressure 11:53 What correct RTV flow looks like 13:00 Thread engagement and control 14:34 Lubrication, wear, and the retail version 15:12 Cleaning and reuse 16:00 Why the right method matters 17:49 Coming soon