I just did this job a few weeks ago.
I went the rout of pulling the engine just because I'd never done it before
and I wanted to have a good look-see inside. Pulling the engine is really
not that difficult. Replacing the seal is strait forward as long as you
follow the manual closely. You do not have to remove the crank, just the
rear main bearing cap. The spring that goes in the seal must be handled
with care. You might want to check the crankshaft end float and maybe order
up a set of thrust bearings (maybe oversized if there is play) as the same
time. These are cheap and also an easy swap. They fit inside the center
bearing.
Is your friends 109 a II or IIA? The seal for the SII is different and
probably NLA. The SIIA seal will work fine but needs a few extra bits to
put it in (two half moon retainers).
Hope this helps...
Paul Quin
1961 SII 88
Victoria, BC
----- Original Message -----
> Steve, the engine really should come out as the crank must be pulled to
> replace the seal.
> --
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