Y4a to Y5 and subsequent retrofit for Y3's

[NW Mailing List]

Ed, thank you for your response to my question. For some reason, I did not
get the email through the mailing list, and only received it when Matt
Goodman mentioned it and then forwarded it.

There is a question I have remaining after your response.  You indirectly
addressed it and sort of touched on the crux of the questions with your
answer. I thought that the Y5's came in 2 batches.  You mention there were
20 exhaust bridges swapped to Y3's but that doesn't explain why only the
first group was rebuilt and renumbered.

2090-2099 - 1st group delivered  as Y4a with assembled frames
2100-2109 - 2nd group *was built with the cast frames and delivered as Y5
(am I incorrect here?)*
**2090-2099 were rebuilt as 2110-2119 and re-classed as Y5, minus 2092
wrecked*

Mike Rector

On Tue, Feb 13, 2024 at 8:30 PM Mike <mrector333 at gmail.com> wrote:

> 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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