KnifeySpoony Posted June 19, 2021 Share Posted June 19, 2021 My new 420R wants to leak from the drain plug on the dry sump tank. Tank is aluminum, and with the copper washer, I figured would need very little torque. Initially only had about 5ftlbs on it. Leaked. Increased to 10. Leaking. Increased to 15. Leaking. Increased to 20. STILL LEAKING!! How tight is safe? I'm thinking about just pumping out all the oil, taking out the drain plug then putting it back in with some thread sealant or just JB weld it in LOL. My plan is to pump the oil out of the tank rather than drain it, which seems to be the favored technique. Anyone with any tips? Link to comment Share on other sites More sharing options...
sf4018 Posted June 20, 2021 Share Posted June 20, 2021 Make sure the port and screw is clean, use a fresh copper washer each time you take the screw off. Link to comment Share on other sites More sharing options...
KnifeySpoony Posted June 20, 2021 Author Share Posted June 20, 2021 Hmmm this is a new build and the bolt/washer were prefitted into the tank, but were loose. I never took them out to inspect/clean. I just torqued it up then filled it up. I suppose it's possible some debris is preventing sealing. Link to comment Share on other sites More sharing options...
Dave W Posted June 20, 2021 Share Posted June 20, 2021 I would check for debris in the threads. If that is not the issue, then I would try Permatex thread sealant # 80632. This is the type of sealant used on engine bolts that go into the water jack or crank case. Does not harden, so there is not a removal problem. Dave W Link to comment Share on other sites More sharing options...
KnifeySpoony Posted June 20, 2021 Author Share Posted June 20, 2021 After the bump up in torque to 20ftlbs yesterday afternoon, this AM the leak is worse. Small pool of oil under the car. I'm going to drain it today then do thread sealant - I have some Permatex 59214. Hopefully it works. Link to comment Share on other sites More sharing options...
KnifeySpoony Posted June 20, 2021 Author Share Posted June 20, 2021 Mystery solved. Clearly the wrong sized copper washer was installed from the factory. Link to comment Share on other sites More sharing options...
KnifeySpoony Posted June 24, 2021 Author Share Posted June 24, 2021 I got a new washer. Better fit but still used some loctite 592. Probably will never remove it again. Link to comment Share on other sites More sharing options...
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