A mate had a lovely 1500SE Dolomite back in the mid 1980's it was used all the time for work etc, mileage wasn't massive, 50K or so.
One lunchtime he asked me to help investigate why he was struggling to get it into reverse gear, on dipping the Clutch the Fan was seen to be moving forward nearly 1/2"!!!
This turned out to be the Thrust washer problem, he ended up putting a 1300 Engine in it from a local scrapyard.
I think the longish stroke of the 1500 and 2500, together with the smallish Big end journals was a stretch to far by Harry Webster and his team considering the original engine was only 800 odd cc?!!!