21-08-2021, 05:44 PM
Further findings/questions.
The dismantled hourglass column and box has thrown up another couple of queries.
The "steering box cover" has the number 1A6141 which does not seem to appear in any of the spares lists. It has the 2 bushes (like C1 - 278) and a thrust washer on the worm sector 1A6125.
And the"clamping cover" also has a different number 1A6118 (6118 suggests a later dating from the usual 1A6117).
The worm (1A6122 or 6123) is internally splined and slides onto the bottom of the splined inner column1A6115. The splines stop 1/4 inch from one end but 1/2 inch from the other end. I am assuming from an engineering point of view that the end with the nearest spines would be at the bottom end of the column?
The balls run in the worm itself with the 1A6131 "bearing cup" forming the outer race and the 1A6124 "bearing cage there just to keep the 17 balls in place. The balls can be put in place pushing against the slight springiness of the cage.
The 2 bearing outer races of this box are too badly marked to be useable. They are an interference fit in the box.
Interesting to note that the Big7 uses same worm 1A6122 (Dec 1937, Oct 1938); and same clamping cover (end plate) 1A6117 as well as worm sector 1A6125.
The Jan 1946 parts list publication 185, shows "steering worm wheel" 1A6023 still available.
It also shows different inner column and worm 1A6115/6123 (instead of 6122) so what difference was 6123?
The dismantled hourglass column and box has thrown up another couple of queries.
The "steering box cover" has the number 1A6141 which does not seem to appear in any of the spares lists. It has the 2 bushes (like C1 - 278) and a thrust washer on the worm sector 1A6125.
And the"clamping cover" also has a different number 1A6118 (6118 suggests a later dating from the usual 1A6117).
The worm (1A6122 or 6123) is internally splined and slides onto the bottom of the splined inner column1A6115. The splines stop 1/4 inch from one end but 1/2 inch from the other end. I am assuming from an engineering point of view that the end with the nearest spines would be at the bottom end of the column?
The balls run in the worm itself with the 1A6131 "bearing cup" forming the outer race and the 1A6124 "bearing cage there just to keep the 17 balls in place. The balls can be put in place pushing against the slight springiness of the cage.
The 2 bearing outer races of this box are too badly marked to be useable. They are an interference fit in the box.
Interesting to note that the Big7 uses same worm 1A6122 (Dec 1937, Oct 1938); and same clamping cover (end plate) 1A6117 as well as worm sector 1A6125.
The Jan 1946 parts list publication 185, shows "steering worm wheel" 1A6023 still available.
It also shows different inner column and worm 1A6115/6123 (instead of 6122) so what difference was 6123?