Posted by jdemaris on March 23, 2008 at 18:37:41 from (69.67.229.14):
In Reply to: Re: roosa master posted by Goose on March 23, 2008 at 09:06:46:
A community or tech college would be one of the last places I'd rely on for accurate information. I worked for years with my hands - and later spent years going nights to college. Thanks heavens I had real hands-on experience first - since much of what was taught in college was outdated or wrong to start with. My best friend had his Masters Electrician's License for 15 years - and then went to school to get an electrical engineering degree. He told me that it dumbed him down - and he had a hard time since it required him to "unlearn" many things he already knew to be true for many years working in the real world. Not all college or tech school is bad - but a lot of it is. All depends on the professor you happen to get.
In regard to history on the Roosamaster pump? Yeah, I know it well. The rotary pump we're discussing here was invented by Vernon Roosa in 1941. His concept was put into production by Hartford Machine Screw Company in Connecticutt and they got their first contract to sell in 1952. Ford was almost their first customer but backed out. So, Hercules became the first. John Deere followed in 1960. The Hartford Co. later changed its name to Stanadyne and also sells Moen water faucets - and makes roller lifters for GM and Ford-IH diesels. When Vernon Roosa first tried to market his pump - American Bosch was trying to sell their rotary pump also. After Vernon Roosa's pump got popular, CAV and Bosch purchased permission to copy the design and produce their own rotary pumps anywhere but in the USA. Now - about the plastic ring you mention - it was NEVER replaced with a steel ring. The earlier DB and JDB pumps Deere used, as well as DBs on Case, Ford, AC, IH, etc. had a plastic weight retainer-dampener ring. The DB2 pumps used in Olds 5.7 diesels, GM 6.2 diesels - and Ford-IH 6.9 and 7.3 diesels also used the same plastic dampener until model year 1985. Then it was eliminated but NEVER with a steel ring. It was replaced with a EID - which stands for elastomer insert drive. Deere also started to use it. It still uses plastic - but the plastic pieces are inserted in a recess surrounded by steel - instead of being held by rivets - that's all. The older DB and JDB pumps can all use the same EID rings as the post-1985 DB2 pumps have.
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