removingrepairing-flange-nut-18-005-89-2335-289

) Service-InformationM otorcycle Group: l8 BMW NA Exhaust February 1989 18 005 89 Service Department (2335) For USA Only Removing/Repairing Exhaust Flange Nut – Boxer Models Situation: Caution: Reminder: Remedies! Note: The finned exhaust nut may become seized to the cylinder head exhaust port threads. Do not try to force the nut off if it is seized. Never-Seize Paste should be applied at the 600-mi1e service. No. 1 : Drill 3 or 4 holes approximately 4 rmi deep using a 6 rrm drill between one pair of fins. Use a 3/4″ cold chfsel to split the metal between the holes until the nut cracks. Be careful not to damage the cylinder head threads. No. 2: Using a hacksaw blade. saw between one pair of fins. Saw to a depth-of approximately 4 111n. Be careful not to saw into the cy1 i nder head threads. Use a 3/4 11 cold chisel to sp1 it the remaining meta 1. By splitting the nut as described in No. 1 and No. 2 above, the pressure on the threads can be relaxed and the nut can be removed and discarded. In many cases, by using a thread file with a thread pitch of 2.0, you can file any seizure marks or galling from the threads. Work a new flange nut onto the threads using a mixture of 1 apping compound and Never-Seize unti 1 the nut threads on smoothly, Removefl ange nut and clean both threads completely. Use a liberal amount of Never-Seize (Part No. 18 21 1 337 499} on the exhaust port threads, along with the new flange nut. .. contd –