Hi davo76, you have nailed it on the head...the engine shaft bearing must be a double row self-aligning bearing. There is a very good thread on this very subject. Click HERE. Please read grumpy's post # 36317. This explains the reasons very well.
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl