On both of my TR 4-cylinder cranks, the pilot fit is precise but slips in with after soaking in oil for 24hrs.(actually I have to check my HVDA manual to see if I soaked it or not), no tapping. I thought it should be a tap in fit too so I used some loctite green made for holding bearing races and such.
I talked to everyone about mine slipping in when I changed it. All the auto guys said no press fit too. Then I called Herman VDA about it and he said, torch it out (needed heat to break the loctite green bond), the bearing should not be locked in. True at least on a TR3-4A where the bearing fit the crank recess fully pushed home.
So after removing the pilot, cleaning up, I inserted with a little lube as Herman instructed. A nice smooth precision fit that I could stick my little finger in and move out and in. The pilot is soft bronze so neither the crank nor input shaft get worn from the bushing spinning. When you think about it, it really makes no difference as long as the input shaft stays centered. Maybe it doesn't spin, maybe they both (pilot and input shaft) spin, maybe just the input shaft. Who knows - we can't see in there to tell?
I also have a TR6 bearing and that thing is only like 3/4" thick, the TR4 bearing is about 1-1/4" long, same diameter as the 6. I've never seen the back end of a TR6 crank so I don't know how deep the pilot hole is. So the 6 might need the interference to keep from falling in if it's as deep as a TR4.
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btw - it's working and I'm not taking it out unless I have to!