I am about to refurbish an oil pump as part of my 650SS engine rebuild. I believe I have the correct pump for a non pressure rocker feed engine as it is a three start drive with wider gears. I am interested in the stampings on the pump:
i) There is a "B" where the milling is for the top mounting nut
ii) There is an "S" near the rubber nipple and
iii) There is an "0" on the lower angle milled face below the bottom mounting hole.
Any clues as to what these stampings mean? See attached photo.
regards,
Ian
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The 'S' informs that thi…
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Previously phil_hannam wro…
Previously phil_hannam wrote:
The 'S' informs that this is the higher capacity pump as used on the early 650 and Atlas engines with the larger journal sizes. Also the later model 88 & 99s. Generally those engines keeping the low pressure return rocker feed.
The other letters I know not.............but I do have a Commando pump which has its part number next to the nipple feed and also has a "T" stamped on the milling for the top mounting nut. I know that sometimes a stamping was made on a part to signify that it had been through a milling procedure and passed an inspection with regard to specification grading. Crankcases for example.
On the cylinder heads you often see a letter "V" which was used to align the casting ready for processing.
The Norton letting seems to follow that of their model numbering in that it is often does not make sense. ie why not stamp a letter "H" for the higher capacity pump? The later 6 speed worm and drive were usually stamped with a "6" to help identify them. But not always!!!
Thanks for the comments Phil. I was just curious as I have checked my other pumps to select the best one and one has a 7 stamped on it and another has a 6 digit number stamped on it.
regards
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The 'S' informs that this is the higher capacity pump as used on the early 650 and Atlas engines with the larger journal sizes. Also the later model 88 & 99s. Generally those engines keeping the low pressure return rocker feed.
The other letters I know not.............but I do have a Commando pump which has its part number next to the nipple feed and also has a "T" stamped on the milling for the top mounting nut. I know that sometimes a stamping was made on a part to signify that it had been through a milling procedure and passed an inspection with regard to specification grading. Crankcases for example.
On the cylinder heads you often see a letter "V" which was used to align the casting ready for processing.
The Norton letting seems to follow that of their model numbering in that it is often does not make sense. ie why not stamp a letter "H" for the higher capacity pump? The later 6 speed worm and drive were usually stamped with a "6" to help identify them. But not always!!!