January 16, 2014
The primary design function of the OE end plug in listed Toyota/Lexus units is to prevent critical pressure loss by capping the bore. OE end plugs rely entirely on small clearances between the end plug and bore to confine hydraulic fluid under fluctuating pressure. End plugs are often tasked with a secondary role functioning as a spring stop or valve stop.
The repetitious and varying actions of fluid pressure, spring motion and valve impact cause wear at the end plug and bore mating surface and can distort the shape of the end plug. High pressure fluid leaking through the clearance gap can, with time, erode the surface material of both end plug and bore. Eventually the cumulative loss of hydraulic integrity leads to low pressure in critical circuits. Complaints vary depending on the location of the worn end plug but are always related to pressure losses.
Sonnax O-ringed end plug kit 147741-30K replaces worn, distorted or eroded end plugs in Toyota/Lexus A760, A960 and AB60 series units. The Sonnax end plugs have small clearances to mechanically block the bore and increase effectiveness. The O-ring seal reduces leakage further by blocking off worn areas of the bore which the new end plug alone could not seal.
|I.D.||Valve Name||End Plug Dia.||Installed Seal Position||O-Ring Size|
|Lower Body No. 1|
|B||Inboard of SR Solenoid||12mm||Outboard||Medium|
|Lower Body No. 2|
|C||B1 Apply Relay||9mm||Inboard||Small|
|Upper Body No. 1|
|L||Clutch Apply Relay||11mm||Outboard||Medium|
|Upper Body No. 2|
|N||C3 Apply Relay||11mm||Outboard||Medium|
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
January 16, 2014
September 28, 2015
December 03, 2013
Vacuum testing at the retainer pin cavity fails to hold the recommended minimum in-Hg or if end plugs are loose to the touch.