roosa master

The part that Goose mentioned is something totally different. The plastic ring that was used to hold the governor-weight holder to the drive-plate was totally eliminated in 1985 in all pickup trucks. It was replaced with the EID setup. The EID can be retrofitted to all the DB or JDB pumps. The 6.2/6.5 GM diesels, and 6.9/7.3 Ford-IH diesels, used DB2 pumps.

I assume you've got the proper toothed Bristol wrench? Stanadyne also sells a guide for it to fit into - but it's causes more harm than good - and you're better off not using it.

In regard to the newer "all metal" retainer that MSB and Goose mentioned - I'm a little lost on that one. The plastic-dampened ring that Deere has in the DB and JDB pumps was an option that just about everyone used. But, even back in the 1950s there was also an all steel plate available - but it was rarely used since it did not absorb vibration. In 1985 a new type of a dampened retainer came out - called the EID - which stands for Elastomer Insert Drive. That is what was used on all the GM 6.2s and 6.5s as well as all the Ford 6.9s and 7.3s after mid-1985. It still has plastic parts - but they are encased by metal instead of being held on by rivets. This EID retainer is an update for the Deere pumps like your's if you want to spend an extra $30.
If not, the older style plastic ring will last you 10 or 15 years which may not be all that bad.

Nice pictures, John.

Roosamaster pumps that GM used on the 5.7 and 6.2 diesels originally had a plastic ring that didn't last so it was replaced with a steel ring. I have no way of knowing if this was the same ring you're talking about. I took a class once on rebuilding Roosamaster pumps, but it's been too many years ago and not enough use of the info.

If you have a community college with a diesel department nearby, they would be a good source of info.

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.