June 12, 2019
Wear in the main pressure regulator bore is common in Jatco/Nissan JF016E (RE0F10D) and JF017E (RE0F10E) units. This wear minimizes line pressure control resulting in delayed engagement and pulley damage.
Reconditioning the bore and installing Sonnax oversized main pressure regulator valve kit 33510N-05K restores accurate pressure control.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.