A B767-400ER WAS DISPATCHED FROM THE GATE WITH THE L ENG THRUST REVERSER IMPROPERLY DEACTIVATED. CTR DRIVE UNIT'S LOCK PLATES INSTALLED INCORRECTLY. ACFT RECALLED TO GATE FOR CORRECTION.

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SHIP ARRIVED OFF FLT WITH A L BLEED HPSOV STATUS MESSAGE WITH ASSOCIATED ENG BLEED OFF LIGHT WITH ENG IN IDLE. REQUESTED AND RECEIVED PERMISSION TO DEFER ITEM PER B767-400 MEL 36-11-02. INSTRUCTION PER STEP 5 OF MEL READ TO DEACTIVATE ASSOCIATED THRUST REVERSER PER MEL 78-31-01. PER STEP 9 OF MEL 78-31-01 -- AT BOTH CDU'S INSTALL THE LOCKOUT PLATE WITH THE SQUARE DRIVE INSERTED INTO THE MANUAL DRIVE PAD. TIGHTEN BOLTS TO 24-27 LB INCHES. AFTER THE ACFT LOGBOOK WAS SIGNED BY MYSELF AND ACFT WAS DISPATCHED; MY FELLOW AMT AND I WERE DISCUSSING WHAT WE HAD DONE. WE CAME TO THE CONCLUSION THAT THE LOCKOUT PLATES WERE NOT PROPERLY INSTALLED. WE IMMEDIATELY CONTACTED THE TWR AND REQUESTED THAT THE ACFT BE RETURNED TO THE GATE SO WE COULD CORRECT THIS PROB. THE ACFT HAD DEPARTED THE ATE AREA BUT HAD NOT TAKE OFF YET. THE ACFT RETURNED TO A GATE AND THE PROB WAS CORRECTED. I WAS AWARE THAT MY FELLOW AMT HAD NOT COMPLIED WITH THIS MEL PROC BEFORE NOW; SO HE WAS NOT TOTALLY FAMILIAR WITH IT. I TAKE FULL RESPONSIBILITY FOR THIS EVENT BECAUSE I SHOULD HAVE MADE SURE EVERYTHING WAS DONE PROPERLY SINCE HE HAD NOT DONE IT BEFORE. I WILL ENSURE IN THE FUTURE THAT THIS DOES NOT HAPPEN AGAIN WHETHER OR NOT THE AMT I AM WORKING WITH IS FAMILIAR WITH THIS PROC. SUPPLEMENTAL INFO FROM ACN 684336: AFTER WORKING THE ACFT AND RETURNING TO THE MAINT OFFICE AND DISCUSSING EVENTS WITH MY FELLOW AMT; I REALIZED THAT STEP #9 HAD NOT BEEN COMPLIED WITH PROPERLY. I HAD UP TO THAT POINT NEVER DEACTIVATED A REVERSER ON A B767-400ER AND MY FELLOW AMT THOUGHT I KNEW TO INSTALL THE LOCKOUT PLATE PROPERLY.