Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 6CTA Coolant leak on top of exhaust manifold › Reply To: 6CTA Coolant leak on top of exhaust manifold
Tony Athens
Engines: QSB 6.7 550 HP
Location: Oxnard, CA
Country: USA
Think positive..
The RTV makes the steel gasket very forgiving–That’s why we changed the Cummins “dry assembly” Protocol , & use RTV as it has a 100% track record as to working very well except in very surface pitted applications.
Using the composite gasket requires not less that 3 re-torques after installation/initial use hot/cold cycles.
I even re-torque the steel gasket after the first start-up when I check for leaks.. BTW, all torquing is done with a box end wrench by “feel” & experience as to what is tight use a grade 12.9 alloy bolt/nut w/ RectorSeal # 5 as the assembly lube.
Tony