Y4a to Y5 and subsequent retrofit for Y3's

[NW Mailing List]

Are there any articles in N&W magazines or annual reports about the
retrofit of the first Y4a/Y5 batch from bolt-assembled frames to solid cast
frames?

What was the extent of this conversion; did the converted Y5's receive a
whole new front engine with drivers/rods/valve gear/etc.., or did they only
receive new frames with all the parts getting re-used?

Finally, did the Y3's get immediately converted, as a Y5 was outshopped? I
can't imagine leaving those big frames (or whole front engine) lying around
the shop for very long.

Mike Rector
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