Dear Listees,
I have collected the following information from a variety of sources.
Corrections, additions, and comments are welcome.
TC, YA, TD to engine number XPAG/TD2/22734, YB to XPAG/SC2/17993
Originally, for these engines, the factory recommended the Champion L10S
plug. This plug has not been produced for many years. Champion replaced
the L10S with the L7. The L7 was superseded by the L85. The L85 was
replaced by the L82C.
The Champion L82C is a current plug and is recommended by Champion as the
replacement for the L10S, L7, and L85.
Notes:
1. The Champion L10 is far too hot for the T-Type and should not be used,
except for special applications.
2. The Bosch W7AC can substitute for the above plugs. Bosch recommends
the W7AC as an alternative to the Champion L85. Champion lists the W7AC as
a substitute for the Champion L82C.
3. The Lodge 3HN is listed as an alternative to the Champion L82C
TD from XPAG/TD2/22735, TF, YB from XPAG/SC2/17994
These engines originally used the Champion NA8 plug. This was replaced by
the N5 which has been superseded by the N5C.
Additional Notes:
1. It is important that the correct plug be used as the TC plug is a ½"
reach while the late TD and TF plug is a ¾" reach.
2. Of course, the engine numbers listed above assume that the original
head is fitted. However, after 50 years, we can assume that the original
head may have been swapped at some stage. How can you tell what head you
have? I know of three ways.
a. Look on the bottom of the head. If the water passages are a banana
shape instead of circular, it's an early head.
b. Measure the spark plug threads. If the depth is ½ inch instead of ¾
inch, then it's an early head.
c. Look at the number cast into the head. If it is 22952, then it should
be an early head.
John Swanland
Melbourne, Australia
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