Gentlemen,
During our recent discussion about the threads in the mounting bosses
for the exhaust mounting bracket, something kept nagging at me regarding
BSF threads in the XPAG engines. I thought that remembered a 5/16 BSF
thread for the clutch return spring bracket on the sumps. Checking in
the chart that I made up listing all of the fasteners used in the
XPAG/XPEG engines, I found that I had listed that thread as a 1/16 BSF.
I finally went down to the basement and checked the three sumps that I
have down there. One is a spare from a very early TD (or possibly from
a TC), one is the broken remains from the engine that I threw a rod in,
and the last one is in our TD. Sure enough, that thread is in fact a
5/16 BSF. On further checking, I found that the threads in the mounting
boss for the end bracket of the cable for the older cable operated
clutch are also 5/16 BSF. Now, for the curious part, The very early
sump and the broke sump off of engine # XPAG/TD2/25293 all of the above
mentioned threads are 5/16 BSF, but on the engine in our TD now
#XPAG/TD2/27677 all of the threads are 1 X 8mm - go figure. Perhaps by
the time Abingdon was modifying the sumps for engines numbers around
27677, they had finally gotten a set of "Mad Metric" taps and dies. The
fact that all of those threads on both sides of the sump are 1 X 8mm
seems to me to preclude some PO having re-tapping those threads, since
at most he/she would have done so for the side that their clutch linkage
was mounted on. As with so many things MG, the deeper one goes, the
more curious it gets.
Cheers,
Dave
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