Hi and welcome to just answer.
there is know adjustment on the tappets they are hydraulic.
have you had any diagnostics done on the vehicle ?
any fault codes?
have you checked all turbo pipes vacuum and intercooler?
do you have access to diagnostics?
for a live data reading.
have you checked and cleaned EGR valve?
most diagnostics have a feature called live data and reading the voltage and signals from sensors can often find where the fault is even without a fault code.
Hi can you get a reading for the ECT sensor (engine coolant temp sensor) at running temp?
i have ask many questions and have been told all the way that this has been replaced or done and feel that given this information if given would have saved time i am opting out and will repost this question for another tech with patience will help you .
Hi there, Here is the procedure to adjust the injectors: The correct method is to use a dial indicator mounted onto the rocker, then rotate the engine until the full depth of the stroke is reached. Screw in the adjuster screw until it bottoms out. Then back it out 180 degrees. Tighten the ball screw lock nut to 24 ft lbs. VW did standardize the setting for all PD motors for a 180 degree setting. The problem is, there is no decent place to attach a dial indicator's bolt-on or magnetic mount. The following pictures show how to do the operation with no dial indicator. This is the position of the cam with the #4 injector rocker fully depressed, side and top view:
Please let me know if this what you were looking for. Cheers.