AN MD80 WAS RELEASED FOR SVC AFTER THE L ENG OIL WAS DRAINED AND THE FILTER REPLACED. ON ENG START CREW RPTED NO OIL PRESSURE OR QUANTITY.

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JUN/THU/03; AT XA45 HRS I STARTED WORKING ON ACFT X TO CHANGE THE OIL FILER AND OIL. I'D CHKED IDI HISTORY (ACFT MAINT HISTORY) ON THE ACFT. #1 ENG HAD A COKING PROB. WORK PREVIOUSLY DONE WAS CHANGE OIL; OIL FILTER. I DID NOT SEE ANYTHING THAT SAID THEY RAN ENG. THE ACFT HAD XD45 DEP TIME. I STARTED TO CHANGE THE OIL FILTER FIRST SINCE IT WAS THE EASIEST THING TO DO FIRST. THE OIL FILTER CAME OFF FINE. THE PROBS STARTED; WHEN I REPLACED THE FILTER. IT WOULDN'T GO ON AS EASY AS IT CAME OFF. IT TOOK ME ABOUT 40 MINS TO GET IT ON RIGHT; BECAUSE IT WASN'T SEALING RIGHT. WHEN I DID GET THE FILTER ON; THE TASK CARD SAID TO TIGHTEN THE CASE BOLTS TO 25-30 INCH LBS; BUT IT TOOK MORE THAN THAT TO SECURE THE FILTER CASE. THE PROB DRAINING THE OIL; IS THAT THE OIL DRAIN VALVE WAS CLOGGED; SO NO OIL CAME OUT. I HAD TO REF THE MAINT MANUAL AND HAD TO REMOVE THE DRAIN VALVE ASSEMBLY. BY THE TIME ALL THIS HAPPENED; IT WAS AFTER XC00 HRS AND THE PLANE WAS LEAVING AT XD45 HRS. RUNNING OUT OF TIME; MY LEAD CALLED AND TOLD ME TO DEFER THE JOB. AT THE SAME TIME; I PUT A SCREW DRIVER INTO THE OIL TANK DRAIN AND A BIG PIECE OF COKED OIL CAME OUT ALONG WITH THE OIL. IT TOOK A WHILE FOR ALL THE OIL TO DRAIN OUT. WITH THE OIL TANK DRAINED; I ASKED MY CO-WORKER TO HELP; ADD OIL TO THE OIL TANK; WHILE I LOCKED THE OIL FILTER CASE BOLTS. WITH THAT DONE; I WENT INSIDE TO DO THE PAPERWORK. I DON'T KNOW HOW; BUT I MUST HAVE MISREAD THE STEP THAT HAD TO DO WITH AN ENG RUN AND CHK FOR OIL LEAKS. SO I CHKED OFF THE BLOCK; BUT DID NOT ACCOMPLISH THE STEP. I COMPLETED THE PAPERWORK; AND THE PLANE LEFT ON TIME. ABOUT 15-20 MINS LATER I WAS TOLD THAT ACFT X RPTED NO OIL PRESSURE OR QUANTITY. I FEEL THE REASON THE STEP WAS NOT DONE BECAUSE OF THE TIME I HAD TO DO THE JOB; THE PROBS I ENCOUNTERED WHILE DOING IT; AND KNOWING IN THE BACK OF MY MIND THAT WHEN I CHKED THE HISTORY EARLIER THAT NIGHT; IT SAID NOTHING ABOUT ENG RUNS.