[omc 47]

Hi Army,

if you look down at your Crankshaft bolt and were to remove it along with the bottom pulley, you would see this "boss" which is keyed onto and slips over the end of the crankshaft and prodrudes out of the timing case initiating the seal of the timing case oil seal.
In the event of wear over the years the boss can be removed and replaced with little effort (much like many of the Volvo components in their day).
In my situation the boss was rubbing on the inner cast housing metal to metal which is at the rear of the oil seal housing.
When these engines originally used felt seals the manual stated that before tightening the timing cover ensure there is an even gap around the boss.
Of course nowadays if the timing cover is supplied with a neoprene seal in situ' this is not possible so hence my problem arose.
If I have to attend to this again I shall remove the oil seal centre the timing cover and then install the new seal............hope this helps.
Thanks Derek you got there before me