Transmission drain plug leak repair

Tags: #automatic-transmission · #drain-plug · #water-ingress

If the transmission drain plug leaks after an oil change, the likely cause is that the plug's cone thread has been stripped (over-torqued or cross-threaded).^1234567

Temporary/semi-permanent fix: apply blue anaerobic thread sealant (Сантехмастер brand or equivalent) to the threads; cure time is 10–15 minutes. Proper repair requires professional re-threading of the pan/housing or replacing the drain bolt at a service shop.^1234567

The transmission drain plug has a gasket/washer that should be replaced at every oil change. Custom washers sized ø20mm × h4mm work as low-cost alternatives across various car brands, not just the FAW-specific part.^1234567

Media

Custom drain-plug washer, ø20mm diameter, 4mm height, fits the transmission drain bolt opening

Same custom washer/gasket shown fitted, illustrating the alternative to the OEM part

Related pages

• AKPP fluid change — drain plug and filter
• AKPP partial ATF change — drain plug, pan, mesh
• AKPP fluid level check — plug, tube, temperature
• Oil pan/plug wetness — leak source diagnosis
• Oil drain plug thread stripping

Sources

This page is compiled from 7 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29