G'day all,
It seemed to be tighter on the shaft rather than the housing, some 200 sandpaper cleaned up the shaft enough to pull it off. It could have been "attached" enough to the shaft that it was rotating within the lower crankcase housing.
Exactly - that's how it's supposed to operate. Its function is to prevent fibrous matter [or wire, etc] from getting wound around the shaft up against the seal itself.
Also, can anyone offer some clarification of the change in 1973/1974? from EN71131A/D Oil Seal Guard Washer to EN71408A Oil Seal Proctector?.
I also noted the change in the Crankcase Lower Half from EN70024A to EN71312A, I assume this "design"? change resulted in the Guard Washer to Proctector change. It would seem there was also an Oil Seal Guard Cup EN71130A in use with the Guard Washer, is this something I am missing that hold the Washer in place?
The first version of the seal protector setup used the Guard Cup outer part - which was a slight interference fit over the lower part of the lower crankcase half.
This was then dropped when the modified lower crankcase half was introduced; with an extension past the outer surface of the oil seal, which incorporated the recess with both axial and [tight] radial clearance around the Seal Protector.
In my family's 1970s Victa dealership, located in a rural town, a very commonly encountered problem with earlier Victas was bottom seals destroyed by bits of hay band wound around the crankshaft.
Sometimes the damage was severe enough for the seal to have spun in the crankcase recess, such that a new seal wouldn't stay put.
In those cases, we'd do a 'oncer' repair by gluing a new seal in with 24-hr Araldite epoxy resin. We'd warn the owner to be sure to tidy up all hay band before mowing thereafter, because if the problem recurred, the only cure was a new bottom half crankcase!
