All VAG indirect engines have a 17mm main shaft. There are other alternatives with almost our pump housing and 20mm axle.I tried once to enlarge a 17mm pump to 20mm main shaft, but there is a small opening to pressurize the seal on the axle and you get into this hole when creating the bigger hole.
Indeed, but not from VAG.I've been working over 12 years on these VE / VP pumps and none of the VAG (VW / Audi / Seat / Skoda) IDI pumps had a 20mm axle. Yes, they have at Ford, PSA (Peugeot, Citroen) and most likely some others.So please show me a pump that has got one, I would be very interested.
Should I remove the AAZ 20 MM shaft reference?
I've seen many 17mm pump that the hub have slipped on the shaft when you try to push the RPM limit maxed with too much fueling, in this case, a 20mm shaft is required, but still it can slip at the extreme.
A jig and a keyway broach would make short work of adding a keyway to the hub.