Timing chain?
I worked all morning to make it go without success. There is nothing around the pump that could impair the process. the problem must somehow be internally. The 3/8" clearance that is showing is evenly all around. I hate to apply brute force for good reason. Thanks for coming back to me and wish that you or someone else reading this has an answer.




If I remember it right, the assy is called "timing device"
You might want to google the name and check W124 sites as well as older pumps had the same design.



