J-Type Overdrive Solenoid Rebuild (Triumph TR6 here)

Most overdrive engaging issues occur with a sticky solenoid. Often times sticking in the on position when hot and won’t release which is dangerous. If stuck On never put car in reverse.

The solenoid controls a ton of pressure. They are very robust and expensive to replace. Typically the five o-rings need to be replaced to restore the solenoid plus a good cleaning.

The J-Type was used in later TR6 Triumphs replacing the earlier A-Type.

This overdrive was in Volvos also.

McMaster-Carr: https://www.mcmaster.com/products/rub...

The Orings you need are:

All BUNA 70.

Size 7. Qty 2 size 007 ID 5/32 OD 9/32 ID0.145" OD 0.285" Durometer 70A (Medium)
Size 10. Qty 1 size 010 ID 1/4 OD 3/8 ID0.239" OD 0.379" Durometer 70A (Medium)
Size 14. Qty 2 size 014 ID1/2 OD 5/8 ID0.489" OD 0.629" Durometer 70A (Medium)

Thanks. #diyhelp