My 93 having a mysterious tapping or knocking under acceleration that comes and goes

[ak diesel driver]

Any ds4 engine I've worked on didn't have any marks

 

[dbrannon79]

Wonder if I should just try retarding it a little and see what happens. iirc advancing is moving the top of the IP towards the passenger fender. this is what I did previously as you can see my blue mark is slightly off (IP turned counter clockwise) correct me if I have it backwards.

 

[GenBiltstein]

since driving the 95 around yesterday and today, I now realize just how much louder the clatter is from the 93 with the newly rebuilt injectors. figured I would look at timing to see if it needs to be adjusted.

took a gander at the IP timing mark and looked for the center timing mark on the timing cover. this engine has a timing cover for a newer block meant for a DS4. looking at this pic, what would be the center mark on the cover? I can see the center (base time) mark on the IP.

View attachment 93475
View attachment 93474

on the DS4 timing cover you can see that tiny "V" shape mark just to the right of the IP mark and my blue paint mark I made for my reference last time I moved the IP. also that weird looking dimple in front of the bolt sticking out. does anyone know what the center base timing mark is on this timing cover? @Will L. @ak diesel driver

That little Vee mark looks like the left side of it is the straight line for a timing mark.